Lassen County, CA: Tiny Homes Allowed | Building Permits & Zoning

Unincorporated Lassen County, California requires building permits before covered construction begins, and the work must comply with county zoning¹. Lassen County Planning and Building Services handles building applications². Lassen County Environmental Health reviews and inspects septic systems, while Planning and Building Services issues the septic construction permit; the county wastewater program also covers Susanville³.

At a glance

Building permit: Required before erecting, altering or demolishing a building or structure in unincorporated areas¹
Zoning: Yes; county zoning controls residential type, location and density in unincorporated areas⁴
Septic permit: Required for new systems, replacements and repairs; Environmental Health reviews and inspects, and Planning and Building Services issues the septic construction permit³
RV living: Permanent RV occupancy is generally not allowed unless a local ordinance provides otherwise; ask Planning and Building Services about the parcel^2,5
Tiny home: Allowed only when approved under a recognized building or vehicle classification and for its location⁶
Owner-builder: Conditional contractor-license exemption; owner acknowledgment, signature verification, building permits and inspections still apply^7,8,9
Water well: A local permit is required before construction, modification or destruction¹⁰

Who to call

Building permits

Lassen County Planning and Building Services

Building and planning applications, permit payment and questions about the county permit process

530-251-8269

landuse@co.lassen.ca.us

707 Nevada Street, Suite 5, Susanville, CA 96130

Septic permits

Lassen County Environmental Health

Septic systems, onsite sewage disposal, water wells and water-supply protection

530-251-8269

ehe@co.lassen.ca.us

707 Nevada St, Suite 5, Susanville, CA 96130

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Do you need a building permit in Lassen County, California?

Unincorporated Lassen County requires a building permit before covered construction, alterations, repairs or demolition, mobilehome installation, and plumbing or electrical work; specific exemptions must be checked for the project¹. County construction must follow California building standards¹¹. Every building permit requires at least one inspection; schedule it at 530-257-5263 and leave the work uncovered for inspection⁹. A building permit expires if work does not begin within one year or is suspended or abandoned for one year⁹. Before issuing a building permit, the county checks zoning compliance and legal-lot status; a parcel created in violation of the Subdivision Map Act needs a recorded certificate of compliance or a conditional certificate with its conditions satisfied¹. A building in unincorporated Lassen County needs a certificate of occupancy before use or occupancy, after required inspections pass and improvements are completed¹.

Who issues Lassen County building permits, and how do you apply?

Lassen County Planning and Building Services is the permit counter for unincorporated land; contact the department at 530-251-8269, landuse@co.lassen.ca.us, or 707 Nevada Street, Suite 5, Susanville, CA 96130². The Building Division accepts electrical, mechanical, plumbing and roofing applications through its online portal, and building-permit applications may also be submitted by email². Online applications go through completeness review before payment and electronic signatures². County planning, building-permit and Environmental Health fee schedules are published, but the amount depends on the application category; ask the department to identify the current fee section for the project¹².

Does Lassen County have zoning?

Yes.

Yes. Lassen County zoning controls the type, location and density of residential development in unincorporated areas⁴. Inside Susanville, the city administers its own zoning¹³. Septic review remains with Lassen County Environmental Health in Susanville as well as unincorporated areas³. Published residential standards vary by district: A-2 lots are 20–40 acres, while R-1, R-2, R-3 and C-T lots are generally 6,000–7,000 square feet, with larger minimums where individual septic or wells are used⁴. Published maximum heights range by district from 25 feet to 45 feet, with design review allowing additional height in specified districts⁴. Those schedules were documented as current only through 2018, so ask Planning and Building Services to confirm the parcel's current district, setbacks, lot size and height before designing^2,4. We could not confirm a general minimum dwelling size; ask the same office before relying on a compact design².

How do septic permits work in Lassen County?

Lassen County Environmental Health reviews septic applications and inspects systems; Planning and Building Services issues the septic construction permit after requirements are met.

Lassen County Environmental Health reviews septic applications and inspects systems; Planning and Building Services issues the septic construction permit after requirements are met³. Reach Environmental Health at 530-251-8269, ehe@co.lassen.ca.us, or 707 Nevada St, Suite 5, Susanville, CA 96130¹⁴. New systems, replacements and repairs require an application with a to-scale plot plan; obtain the septic construction permit before starting work³. Where a building depends on septic, Environmental Health layout approval and a valid septic construction permit must precede building-plan approval or building-permit issuance³. The septic construction permit lasts one year, with one possible one-year extension requested before expiration; inspections must occur before backfilling and occupancy³. Plan the house, well and septic layout together: septic tanks and disposal systems generally need 100 feet from private wells, and lots of 30,000 square feet or more require all wastewater components at least 50 feet from property lines, subject to the narrow-parcel provisions³. Only about 8.6% of county soils rate “not limited” for conventional drain fields; a poor rating calls for site evaluation and possibly an engineered system, rather than proving septic is impossible¹⁵.

Can you live in an RV or tiny home on your land in Lassen County?

California generally limits RV and park-trailer occupancy to authorized mobilehome or special-occupancy parks unless a local ordinance allows another arrangement.

California generally limits RV and park-trailer occupancy to authorized mobilehome or special-occupancy parks unless a local ordinance allows another arrangement⁶. In any Lassen County zoning district, a recreational vehicle may serve as temporary living quarters during construction of a primary residence, but only for the period shown on the approved building permit¹⁶. We could not confirm a rule for long-term RV living on a private parcel once construction ends, so ask Planning and Building Services about the parcel before relying on an RV as permanent housing². A tiny home in Lassen County must meet the standards of and be approved as a code-compliant dwelling, manufactured home, factory-built home, RV, park trailer or camping cabin before occupancy; approval also depends on the location and classification⁶. California requires ADU applications to receive ministerial review without a discretionary hearing; building, health, safety, fire and utility requirements still apply^17,18. On a Lassen County property using septic, Environmental Health must review an ADU and a qualified professional must verify that an existing system is adequately sized³.

What are the steps to building a home in Lassen County?

Confirm the parcel is unincorporated and ask Planning and Building Services for its current zoning district, allowed residential use, lot standards and setbacks.

Confirm the parcel is unincorporated and ask Planning and Building Services for its current zoning district, allowed residential use, lot standards and setbacks^2,4.

Have Environmental Health evaluate onsite-wastewater feasibility, then obtain the septic construction permit before work begins³.

If a well is needed, obtain the applicable local permit before construction, modification or destruction¹⁰.

For a new structure covered by county fire-safety requirements, consult the Fire Warden about water supply before permit issuance¹⁹.

Submit the building application and confirm the applicable published fee category with Planning and Building Services^2,12.

If acting as an owner-builder, personally read, initial, sign and return the county acknowledgment and provide acceptable signature verification; an agent needs prior county approval to execute the notice⁸.

Keep building and septic work exposed for required inspections and obtain the certificate of occupancy before using the building^1,3,9.

What should you check before buying land in Lassen County?

Confirm the zoning-district lot minimum and wastewater rules: a lot using an individual well and septic generally needs at least one acre and adequate area and soils, with variance provisions for existing legally created smaller lots^3,4. Dividing unincorporated Lassen County land for sale, lease or finance is regulated under the Subdivision Map Act and county code, subject to agricultural and mineral-lease exceptions; subdivisions using septic also face wastewater review and density limits^3,20. Check water next; California requires a local permit before a water well is constructed, modified or destroyed¹⁰. Confirm legal access and ask the county whether a county-road driveway needs approval; a connection within a state-highway right of way requires a Caltrans encroachment permit²¹. Ask Planning and Building Services about floodplain requirements because we could not confirm the general permit trigger².

Watch-outs

An owner-builder exemption concerns contractor licensing and does not remove building-permit or inspection duties; Lassen County requires the owner acknowledgment and acceptable signature verification before issuing the building permit^7,8.
Most Lassen County soils carry severe limitations for a conventional septic drain field, and onsite disposal also depends on lot size, adequate area and soil, and whether public sewer is available^3,15,22.
Lassen County allows temporary RV quarters during construction for the period on the approved building permit; we could not confirm long-term private-parcel RV occupancy or general floodplain-development requirements, so ask Planning and Building Services before buying^2,16.

Sources

22 official pages, each quoted and re-checked · written October 12, 2026

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Off-grid gear

Going off-grid in Lassen County means bringing your own water and power. The kit we’d start with:

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Compared with neighboring counties

Like all 6 of its neighbors, Lassen County requires a building permit for a home.

Rule	Lassen County	Plumas County	Sierra County	Modoc County	Butte County	Shasta County	Nevada County
Building permit	Required	Required	Required	Required	Required	Required	Required
County zoning	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Septic permits	County Env. Health	County Public Health Agency	County Env. Health	County Env. Health Dept.	County Env. Health Div.	County Env. Health	County Env. Health Dept.

Answers from the rulebook for Lassen County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Lassen County rules

Building permitRequired
Erecting, constructing, enlarging, altering, repairing, moving, improving, removing, converting, or demolishing a building or structure; installing a mobilehome; or installing or altering plumbing or electrical wiring or fixtures in the unincorporated territory of Lassen County, subject to Chapter 12.24.
- A building permit must be obtained from the Lassen County building official before the covered work begins.
- Failure to secure a required permit is declared a public nuisance under the Lassen County Code.
- Before issuance, the parcel must satisfy the code's legal-lot determination requirements; parcels created in violation of the Subdivision Map Act require a recorded certificate of compliance or conditional certificate of compliance, with all conditional-certificate conditions satisfied before permit issuance.
- For buildings, mobilehomes, or electrical work requiring private sewage disposal, sewage-disposal approval must be obtainable before permit issuance, subject to the stated agricultural, upgrade, repair, and exclusionary electrical or mechanical permit exceptions; the exception does not apply to a food establishment.
- No building permit may be issued unless the building official is satisfied that the authorized construction will not violate an existing zoning ordinance.
- The cited general-permit section does not enumerate all permit exemptions; specialized California Building Standards Code provisions and Lassen County Chapter 12.27 may apply to particular construction types.
- The county rule applies to unincorporated territory; the City of Susanville is outside this claim's scope.
“without having first obtained a building permit therefor”
Helpful Links | Lassen County, CA ↗Re-checked Oct 6, 2026
Owner-builder exemptionConditional
Owner-builders applying for Lassen County construction permits.
- The county will not issue the building permit until the owner-builder acknowledgment has been read, initialed, signed, and returned.
- An agent cannot execute the notice unless the property owner obtains prior approval of the permitting authority.
- The owner-builder is the responsible party of record and legally and financially responsible for the proposed construction activity.
- Before permit issuance, the form must be completed and signed by the property owner and returned to the issuing agency.
- A copy of the owner’s driver’s license, notarization, or other agency-acceptable verification is required when the permit is issued to verify the owner’s signature.
- For single-family residential structures intended for sale, the county package states that construction is subject to the licensed-subcontractor/four-structures-per-calendar-year or licensed-general-contractor conditions.
single-family structures offered for sale per calendar year: <= 4 structures (The limit does not apply if the owner contracts with a licensed general building contractor.)
“Disclosures & Forms for Owner-Builders Applying for Construction Permits”
Property Owner’s Package ↗Re-checked Oct 1, 2026
One more reviewed finding on this topic
- Available (with conditions) — Owner-builders applying for Lassen County construction permits.
  “We will not issue a building permit until you have read, initialed your understanding of each provision, signed, and returned this form to us at our official address indicated. An agent of the owner cannot execute this notice unless you, the property owner, obtain prior approval of the permitting authority.”
  Property Owner’s Package: Disclosures & Forms for Owner-Builders Applying for Construction Permits ↗Re-checked Sep 24, 2026
Building code adoptedAdopted (with conditions)
Building-code enforcement by Lassen County Planning and Building Services.
- The California Building Standards Code is Title 24 of the California Code of Regulations.
- The source states the California Building Standards Commission adopted enforcement effective January 1, 2023.
- Lassen County lists enforcement of the 2022 California Building, Residential, Green Building Standards, Mechanical, Electrical, Plumbing, Energy, Existing Building, and Historical Building Codes.
- The source also identifies county-specific structural design criteria, including wind, seismic, soil-bearing, and footing-depth criteria.
effective date: 2023-01-01 · commercial wind speed: 75 mph ASD; 96 mph Ultimate · residential wind speed: 75 mph ASD; 96 mph Ultimate · allowable design soil bearing pressure: 1500 psf (unless justified by a geotechnical investigation report) · footing depth: >= 18 inches below finished grade
“Effective January 1, 2023, The California Building Standards Commission adopted the enforcement of the 2022 California Building Standards Code, Title 24 of the California Code of Regulations. Building Design Criteria: Lassen County enforces the following codes: 2022 California Building Code (CBC) 2022 California Residential Code (CRC) 2022 California Green Building Standards Code (CGBSC) 2022 California Mechanical Code (CMC) 2022 California Electrical Code (CEC) 2022 California Plumbing Code (CPC) 2022 California Energy Code 2022 California Existing Building Code 2022 California Historical Building Code”
2022 Building Codes and Design Criteria ↗Re-checked Sep 24, 2026
InspectionsRequired
All Lassen County building permits administered under the county building code.
- The county states that all building permits require at least one inspection.
- Inspections are scheduled by calling 530-257-5263, available 24 hours.
- The county states that permit validity is tracked through inspection records; permits expire if work is not commenced within one year or is suspended or abandoned for one year.
- For reactivation after suspension or abandonment, the county states that a fee may apply and that the fee includes the required inspection.
minimum inspections per building permit: >= 1 inspection · permit commencement period: 1 year (Permits expire if work is not commenced within one year from the permit date.)
“All building permits require at least one inspection. Call 530-257-5263 (24 hours) to schedule your inspection.”
Inspection and Expiration of Building Permits ↗Re-checked Oct 1, 2026
One more reviewed finding on this topic
- Required — All Lassen County building permits.
  “All building permits require at least one inspection. Call 530-257-5263 (24 hours) to schedule your inspection.”
  Inspection and Expiration of Building Permits ↗Re-checked Oct 3, 2026
Certificate of occupancyLimited
New-structure projects subject to Lassen County fire-safety building-permit requirements and certificate-of-occupancy approval.
- The source states that execution of the declaration is required before issuance of any building permit for a new structure.
- The source states that its standards do not apply to additions to existing structures.
- All required construction must be completed and approved before issuance of the certificate of occupancy.
- The applicant, property owner, or contractor must consult the Fire Warden regarding water-supply requirements before issuance of a building permit.
- The source states that the County Code Chapter 9.16 and California Code of Regulations section 1270 fire-safe regulations control if inconsistent with the declaration, as identified by the Fire Warden.
“All required construction must be completed and approved prior to issuance off a certificate of occupancy.”
Declaration Fire Safety Regulation Building Permit Requirements ↗Re-checked Oct 1, 2026
2 more reviewed findings on this topic
- Limited — Projects subject to the Lassen County Fire Safety Regulation Building Permit Requirements, including new structures covered by that document.
  “The applicant/property owner or contractor is responsible for consulting with the Fire Warden regarding water supply requirements (if any) prior to the issuance of a building permit. All required construction must be completed and approved prior to issuance off a certificate of occupancy.”
  Declaration Fire Safety Regulation Building Permit Requirements ↗Re-checked Sep 24, 2026
- Required — Use or occupancy of any building in the unincorporated territory governed by Lassen County's building-permit code.
  “prior to issuance of a certificate of occupancy by the chief building official”
  Helpful Links | Lassen County, CA ↗Re-checked Oct 6, 2026
County-wide zoningPresent (with conditions)
Residential development in Lassen County's unincorporated areas.
- The zoning ordinance is Ordinance No. 467, adopted January 1984 and subsequently amended.
- The county zoning policies control the type, location, and density of residential development in unincorporated areas.
- The source does not establish county zoning authority inside incorporated municipalities.
“The Lassen County Zoning Ordinance (Zoning Ordinance No. 467, adopted January 1984 and as subsequently amended) is the main implementing instrument for residential development policies, which are set forth in the County General Plan and the area plans. The policies establish and control the type, location, and density of residential development in the unincorporated areas of the county.”
Lassen County General Plan 2019–2024 Housing Element ↗Re-checked Sep 24, 2026
Local zoningVaries (with conditions)
Aggregate local-zoning conclusion for Lassen County, including the county's unincorporated zoning area and any incorporated or subordinate jurisdictions.
- The official source confirms county-administered zoning for unincorporated areas only.
- The county ordinance controls residential type, location, and density in unincorporated areas.
- This aggregate claim does not treat the county as administering every incorporated or subordinate jurisdiction's ordinance.
“Zoning regulates land use within the City. Each parcel in the City is assigned to a zone district, which describes allowable land uses within that zone, land use permit requirements, and site development standards on setbacks, maximum structural height, landscaping, lighting, parking and signs.”
Lassen County General Plan 2019–2024 Housing Element ↗Re-checked Sep 24, 2026
Minimum lot sizeSpecified
Lots proposed to be created or developed in Lassen County using an onsite wastewater treatment system, where domestic water is supplied by a single connection well and sewage disposal uses a septic tank.
- The one-acre requirement applies to lots proposed to be created and developed using OWTS.
- No OWTS may be installed unless the Environmental Health Department determines that adequate area and soil conditions exist.
- Existing legally created parcels or lots under one acre may apply for a variance.
- No variance may be granted for a parcel with less than 15,000 square feet net area.
- Development density is limited to two EDUs per acre, subject to the stated supplemental-treatment alternatives and private-well/nitrate or pathogen conditions.
minimum lot size: >= 1 acre (For lots proposed to be created and developed using OWTS under the stated single-well/septic conditions.) · minimum variance parcel area: >= 15000 square feet net (No variance may be granted below this area.) · development density: <= 2 EDU per acre (The LAMP provides specified alternatives for larger residences and certain private-well or water-quality conditions.)
“The EHD has had a minimum lot size requirement of 1 acre, since 1981, for lots proposed to be created and developed based on the use of OWTS. In accordance with Lassen County Code Section 12.12.020 -Minimum Lot Size for the Installation of Private Sewage Systems, if the lot is to be served by a single connection well for the source of domestic water and the sewage disposal is by means of a septic tank system, then the lot size shall not be less than one acre. Further, no OWTS shall be installed on any parcel of land unless, in the opinion of the EHD, adequate area and soil conditions exist for the proper installation of the necessary septic tank system.”
lassencounty.gov ↗Re-checked Oct 3, 2026
One more reviewed finding on this topic
- District specific (with conditions) — Residential zoning districts in unincorporated Lassen County, including A-2, R-1, R-2, R-3, and C-T districts
  “Minimum Lot Size 20–40 minimum acres 6,000–7,0001 square feet”
  Lassen County 2019–2024 Housing Element ↗Re-checked Oct 4, 2026
SetbacksSpecified
Horizontal setbacks for OWTS components, including septic tanks, building sewers, and leach trench or disposal systems, in Lassen County.
- The OWTS location must be approved by EHD and may not be in high groundwater, filled ground, a proposed improvement, an easement, or sloping ground exceeding 30 percent.
- Specific setbacks vary by system design and site conditions and are stated in LAMP Table 7-1.
- Distances from buildings include porches, steps, breezeways, roofed porte-cocheres, roofed patios, carports, covered walks, covered driveways, and similar structures or appurtenances.
- Additional setback requirements apply to disposal systems near drinking-water wells and surface-water intakes under Chapter 5, Item 16.
- Lots of 30,000 square feet or more must place all OWTS components at least 50 feet from property lines; where a parcel is too narrow, the setback is applied to the greatest extent possible while complying with Table 7-1, and half the width of an adjacent county road may count toward the setback.
- For systems discharging 5,000 gallons per day or more, DDW must be consulted to determine adequate setbacks.
- Where minimum setbacks cannot be met, supplemental-treatment requirements may apply; water-supply setbacks under the State Policy are separately addressed.
building sewer setback from building or structure: 2 ft (Table 7-1 footnote applies to included appurtenances.) · leach trench/disposal system setback from building or structure: 8 ft (Table 7-1 footnote applies to included appurtenances.) · septic tank setback from building or structure: 5 ft (Table 7-1 footnote applies to included appurtenances.) · leach trench/disposal system setback from private or monitoring well: 100 ft (Additional drinking-water setback provisions may apply.) · septic tank setback from private or monitoring well: 100 ft (Additional drinking-water setback provisions may apply.) · leach trench/disposal system setback from public water well: 150 ft (Additional drinking-water setback provisions may apply.) · septic tank setback from public water well: 150 ft (Additional drinking-water setback provisions may apply.) · leach trench/disposal system setback from lake, reservoir, or wetland high-water line: 200 ft · septic tank setback from lake, reservoir, or wetland high-water line: 200 ft · leach trench/disposal system setback from flowing water body: 100 ft · septic tank setback from flowing water body: 100 ft · leach trench/disposal system setback from water line: 5 ft · septic tank setback from water line: 5 ft · leach trench/disposal system setback from pressurized public water main: 25 ft · septic tank setback from pressurized public water main: 25 ft · leach trench/disposal system setback from unstable land mass or earth slides: 100 ft · septic tank setback from unstable land mass or earth slides: 100 ft · leach trench/disposal system setback from ephemeral stream: 50 ft · septic tank setback from ephemeral stream: 25 ft · leach trench/disposal system setback from cut bank: 4 times bank height ft (Table footnote diagram applies.) · septic tank setback from cut bank: 25 ft · leach trench/disposal system setback from distribution box: 5 ft · septic tank setback from distribution box: 5 ft · leach trench/disposal system setback from large trees: 10 ft · septic tank setback from large trees: 10 ft
“Table 7-1: Required Setbacks for OWTS Components Minimum Horizontal Distance [ft.] Required from: Building Sewer Leach Trench/Disposal System Septic Tank Building/Structure1 2 8 5 Property Line4 -With Wells 25 50 50 -Without Wells 25 5 5 Private Wells/ Monitoring Wells3 50 1005 1005 Public Water Wells3 100 1505 1505 Lake, Reservoir, Wetlands (measured from high-water line) 50 200 200 Flowing Water Body 50 100 100 Water Line 1 5 5 Pressurized Public Water Main 10 252 252 Unstable Land Mass/Earth Slides 100 100 100 Ephemeral Streams 25 50 25 Cut Bank 10 4x height6 25 Distribution Box - 5 5 Large Trees - 10 10”
Local Agency Management Program (LAMP) ↗Re-checked Oct 7, 2026
Building heightDistrict specific (with conditions)
Maximum building heights in residential zoning districts in unincorporated Lassen County
- A-2 maximum height is 35 feet.
- R-1 and R-2 maximum height is 25 feet, with 35 feet available with design review approval.
- R-3 maximum height is 45 feet.
- C-T maximum height is 25 feet, with 45 feet available with design review approval.
- For the P-C district, the source states that R-1 and R-2 uses have a 35-foot maximum building height.
- The source states the zoning ordinance was current through Ordinances 2018-009 and the October 2018 code supplement; current post-2018 confirmation remains outstanding.
A-2 maximum height: 35 feet · R-1 maximum height: 25 feet (35 feet with design review approval) · R-2 maximum height: 25 feet (35 feet with design review approval) · R-3 maximum height: 45 feet · C-T maximum height: 25 feet (45 feet with design review approval) · P-C R-1/R-2 uses maximum height: 35 feet
“Height Maximum 35 ft. 25 ft.2 25 ft.2 45 ft. 25 ft.3”
Lassen County 2019–2024 Housing Element ↗Re-checked Oct 4, 2026
Living in an RVTemporary only (with conditions)
Use of a recreational vehicle as temporary living quarters in any Lassen County zoning district during construction of a primary residence or other primary-use structure.
- The use must occur during a period of construction of the primary residence or other primary-use structure.
- The use must be clearly temporary.
- The permitted period is limited to the time indicated on the approved building permit for the residence or primary-use structure.
duration: period indicated on approved building permit
“A recreational vehicle may be used as temporary living quarters during a period of construction of a primary residence or other primary use structure in any district, provided such use is clearly temporary for the period of time indicated on the approved building permit for the residence/primary use structure.”
Lassen County Code, Chapter 18.102, § 18.102.017 Recreational vehicle use as temporary living quarters ↗Re-checked Oct 9, 2026
Accessory dwellingsLimited
Accessory dwelling units proposed for existing developments using onsite wastewater treatment systems in Lassen County
- The ADU must be reviewed for approval by Lassen County Environmental Health Division.
- For an ADU added to an existing installed OWTS, a Qualified Professional must verify that the system is adequately designed and sized.
- The system must meet all applicable LAMP requirements, including minimum lot size requirements and Equivalent Dwelling Units.
- If a new OWTS is proposed in addition to or to accommodate an ADU, the system is treated as a new development and must meet all LAMP requirements, including groundwater protection.
“Accessory Dwelling Units (ADUs) proposed to be added to existing developments utilizing OWTS will be reviewed for approval by EHD. To add an ADU to an existing, installed OWTS, the system must be verified by a Qualified Professional to be adequately designed and sized, and meet all applicable requirements provided here in this LAMP, including the minimum lot size requirements and Equivalent Dwelling Units (EDU). If a new OWTS is proposed in addition with an ADU or to accommodate an ADU, the system will be treated as a new development and must meet all the requirements provided herein, including protection of groundwater.”
Local Agency Management Program (LAMP) ↗Re-checked Oct 5, 2026
Who permits septicCounty
Onsite wastewater treatment systems and septic systems in Lassen County.
- The Lassen County Environmental Health Department administers the OWTS permitting and inspection process; the Department of Planning and Building Services issues the permit to construct after the requirements are met.
“Since 1981, onsite sewage disposal systems in Lassen County have been regulated by the Environmental Health Department (EHD).”
lassencounty.gov ↗Re-checked Sep 24, 2026
Septic permitRequired
Construction requiring installation of a new, or replacement or repair of an existing, onsite wastewater treatment system in Lassen County.
- A completed permit application and to-scale plot plan must be submitted to the Environmental Health Department.
- A permit to construct the OWTS is issued after the stated requirements are met by the Lassen County Department of Planning and Building Services.
- The permit expires after one year; one one-year extension may be granted if requested while the permit remains valid.
- The system must be inspected by Environmental Health before backfilling; final approval may be held pending specific conditions.
- If a building permit relies on an OWTS, Environmental Health layout approval and a valid OWTS construction permit are required before building-plan approval or issuance of the building permit.
- Final OWTS inspection must occur before the premises can be occupied.
- OWTS with projected wastewater flow over 10,000 gallons per day, certain high-strength wastewater systems, and certain high-strength commercial food-service systems are outside the LAMP and require individual waste-discharge requirements or a waiver from the Regional Water Quality Control Board.
- The LAMP applies to unincorporated areas and incorporated Susanville.
LAMP applicability flow threshold: <= 10000 gallons per day (OWTS over this projected flow are not included in the LAMP and require individual WDRs or a waiver.) · construction permit validity: 1 year (One extension of one year may be granted if requested while the permit is still valid.)
“A completed permit application, including a to-scale plot plan, must be submitted to the EHD for any construction that requires the installation of a new, or the replacement/repair of an existing OWTS. Permitting shall be done in accordance with current Lassen County permitting procedures.”
Local Agency Management Program (LAMP) ↗Re-checked Oct 7, 2026
2 more reviewed findings on this topic
- Required — Construction of new, replacement, engineered, supplemental, or otherwise permitted onsite wastewater treatment systems in Lassen County.
  “If the requirements set out above have been met, a permit to construct the OWTS will be issued by the Lassen County Department of Planning and Building Services.”
  Local Agency Management Program (LAMP) ↗Re-checked Oct 4, 2026
- Required — Construction requiring installation of a new, or replacement or repair of an existing onsite wastewater treatment system (OWTS), including septic systems, in Lassen County.
  “A completed permit application, including a to-scale plot plan, must be submitted to the EHD for any construction that requires the installation of a new, or the replacement/repair of an existing OWTS.”
  lassencounty.gov ↗Re-checked Oct 7, 2026
Septic inspectionRequired
New, replacement, repair, engineered, and supplemental-treatment OWTS in Lassen County.
- The system must be inspected by EHD before backfilling.
- A satisfactory inspection is required for EHD approval of the OWTS permit; final approval may be held pending specific conditions.
- Required inspections include an initial site-approval inspection and a final inspection before backfilling and before occupancy.
- An excavation inspection for the septic tank and drain field may also be required.
- Supplemental-treatment systems require at least annual inspection by a Qualified Inspector, with reports submitted to EHD within 30 days; failing systems must be reported within 48 hours.
supplemental-treatment inspection frequency: per 1 year (Inspection reports must be submitted to EHD within 30 days; failing systems must be reported within 48 hours.)
“The system must be inspected by EHD prior to backfilling the system. If the inspection is satisfactory, EHD will approve the OWTS permit.”
lassencounty.gov ↗Re-checked Sep 24, 2026
Off-grid sanitationLimited
New or replacement onsite wastewater treatment systems (OWTS), including conventional septic systems, in Lassen County; the LAMP applies to unincorporated areas and incorporated Susanville.
- New or replacement OWTS are not authorized by the County Environmental Health Department where public sewer is available.
- Public sewer is available when the property abuts a public sewer, or is within the sewer district boundaries, or annexation has been approved by the sewer district.
- A waiver of connection may be considered when the sewer is more than 200 feet from the building or plumbing stub out, connection fees and construction costs exceed twice the total OWTS cost, and the OWTS meets the LAMP minimum requirements without making groundwater or surface water unfit for drinking or other uses.
- Cesspools are prohibited regardless of size.
- OWTS receiving projected flows over 10,000 gallons per day are not authorized by the County Environmental Health Department.
- OWTS receiving projected flows over 3,500 gallons per day must use qualifying supplemental treatment or submit a Qualified Professional evaluation addressing adverse groundwater effects.
- Surface-discharge systems, certain steep-slope systems, systems with specified groundwater separation deficiencies, and OWTS dedicated to significant RV holding-tank waste are not authorized under the listed LAMP conditions.
- A completed permit application and to-scale plot plan must be submitted to the Environmental Health Department for construction requiring installation of a new or replacement/repair OWTS.
public sewer distance for waiver consideration: > 200 feet (waiver may be considered only if connection fees and construction costs are greater than twice the total OWTS cost and the OWTS satisfies LAMP water-quality requirements) · projected OWTS flow requiring special treatment or evaluation: > 3500 gallons per day (supplemental treatment or Qualified Professional groundwater evaluation required) · maximum projected OWTS flow authorized by County EHD: <= 10000 gallons per day (flows over 10,000 gallons per day are not authorized by County EHD)
“Installation of new or replacement OWTS where public sewer is available. Public sewer availability is defined as follows:”
Local Agency Management Program (LAMP) ↗Re-checked Oct 3, 2026
Subdividing landRegulated (with conditions)
Land development and subdivisions in Lassen County that propose onsite wastewater treatment systems, including subdivisions under the California Subdivision Map Act.
- Tentative maps for land development or subdivisions involving five or more lots must be transmitted to the Regional Board or health office with sufficient information to determine compliance with the LAMP.
- The LAMP does not replace other local approval processes, including approvals from Lassen County Department of Planning and Building Services and the Technical Advisory Committee.
- For subdivisions containing 100 lots or more, the tentative map must be transmitted to the Regional Board with a Report of Waste Discharge and sufficient information to demonstrate compliance; a maintenance entity may be required before discharge of waste.
- The average density for a subdivision using OWTS may not exceed 2 EDUs per acre, subject to the LAMP and Lassen County zoning codes.
subdivision referral threshold: >= 5 lots (Tentative maps involving five or more lots.) · large subdivision threshold: >= 100 lots (Additional Regional Board transmission and Report of Waste Discharge requirements apply.) · maximum average OWTS density: <= 2 EDU per acre (As specified in Lassen County zoning codes and the LAMP.)
“Tentative maps for subdivisions containing one hundred lots or more shall be transmitted to the Regional Board.”
Local Agency Management Program (LAMP) ↗Re-checked Oct 3, 2026
One more reviewed finding on this topic
- Regulated (with conditions) — Division of land in unincorporated Lassen County for sale, lease, or finance.
  “A subdivision is any division of land for the purposes of sale, lease, or finance, and is governed by the State Subdivision Map Act”
  Lassen County Subdivision Process ↗Re-checked Oct 6, 2026
Permit feesPublished (with conditions)
Lassen County planning, building-permit, environmental-health, and related county fee schedules administered under the county code.
- The official county amendments page publishes Ordinance Number 2024-06 as a Fees Ordinance.
- The Board of Supervisors minutes state that Ordinance 2024-06 repeals and replaces the Planning Fees and Building Permit Fees sections of the Lassen County Code.
- The exact fee depends on the applicable permit or application category and fee section.
- The ordinance materials also address Environmental Health Fees and Mining Fees; the minutes state that the mining-fee fiscal impact was unknown.
“Ordinance Number 2024-06 (PDF) > Fees Ordinance”
New Amendments to Code ↗Re-checked Oct 3, 2026
Permit processPublished (with conditions)
Electrical, mechanical, plumbing, and roofing building permit applications handled by the Lassen County Building Division.
- Online applications are processed after completeness is verified.
- Applicants are notified when additional information is required or when the permit is ready for issuance.
- After department review, applicants can pay and receive electronic signatures.
- The permit can be printed after all required parties sign it.
“Lassen County Building Division is now accepting building permit applications through our Lassen County Online Portal, for Electrical, Mechanical, Plumbing, and Roofing permits. Online applications are processed after completeness is verified.”
Permits & Applications ↗Re-checked Sep 24, 2026

California rules that apply here

Zoning districtsPartial
California city and county zoning codes and the zoning districts established by those local jurisdictions.
- The city or county zoning code implements general-plan policies at the individual-parcel level.
- Local zoning codes identify allowed land uses in the jurisdiction’s zoning districts.
- Since 1971, state law requires city or county zoning codes to be consistent with the jurisdiction’s general plan, except in charter cities.
- The source does not publish a statewide list of parcel-specific zoning districts; the applicable local jurisdiction must be consulted.
“The zoning code presents standards for different land uses and identifies which land uses [...] are allowed in the various zoning districts of the jurisdiction.”
Chrome Plating Amendments Environmental and Regulatory Setting ↗Re-checked Sep 26, 2026
Minimum dwelling sizeSpecified
Efficiency units permitted by a California city, county, or city and county.
- The local jurisdiction must adopt an ordinance permitting the efficiency unit.
- Occupancy is limited to no more than two persons.
- The unit may have partial kitchen or bathroom facilities as specified by the local ordinance.
- All other applicable minimum standards under Health and Safety Code Part 1.5 continue to apply.
minimum floor area: >= 150 square feet · maximum occupancy: <= 2 persons
“Notwithstanding Sections 17922, 17958, and 17958.5, a city, county, or city and county may, by ordinance, permit efficiency units for occupancy by no more than two persons which have a minimum floor area of 150 square feet and which may also have partial kitchen or bathroom facilities, as specified by the ordinance.”
California Health and Safety Code Section 17958.1 ↗Re-checked Sep 9, 2026
Camping on your landLimited
Camping in units operated by the California Department of Parks and Recreation statewide.
- Camping is confined to areas designated for that purpose.
- Occupancy by the same persons, equipment, or vehicles is generally limited to 30 days in any calendar year in that unit.
- The Department may establish shorter or longer occupancy limits.
- When a shorter seasonal limit applies, the camper must vacate the campsite and may not reregister in the unit until 48 hours have expired, measured from 12:00 noon on the checkout day to 12:00 noon on the second day following.
- A district superintendent may permit one-night camping in a day-use area or portion of one, subject to Department-established fees and vehicle limitations; occupants must vacate by 9:00 a.m. the following morning.
- California State Parks' current reservation policy states that each campground has a consecutive-night limit, requires a 48-hour absence after that limit, and generally has a 30-night annual maximum, subject to individual park policies.
general annual occupancy limit: 30 days per calendar year per unit (The Department may establish shorter or longer limits of occupancy.) · return interval after shorter seasonal limit: 48 hours (Measured from 12:00 noon of the checkout day to 12:00 noon of the second day following.) · one-night camping in day-use area: 1 night (Only if permitted by the district superintendent; occupants must vacate by 9:00 a.m. the following morning.)
“Occupancy by the same persons, equipment, or vehicles of any camping facility is limited to a total of 30 days in any calendar year in that unit.”
California Off-Highway Motor Vehicle Laws 2014 ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — Temporary camping in California special occupancy parks, including parks containing recreational vehicles, tents, or camping cabins.
  ““Special occupancy park” means a recreational vehicle park, temporary recreational vehicle park, incidental camping area, or tent camp.”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
Tiny homesAllowed (with conditions)
Occupancy of a structure marketed or described as a tiny home in California.
- The tiny home must comply with applicable standards and be approved as a HUD-Code manufactured home, California Residential or Building Code home, factory-built housing, recreational vehicle, park trailer, or camping cabin.
- The location must be approved for the applicable classification.
- A tiny home that does not fit one of those classifications and does not comply with the California Building Standards Code is a noncomplying structure whose occupancy is illegal.
- Approving and enforcing agencies vary depending on whether the unit is inside or outside a mobilehome or special occupancy park.
park trailer or RV gross area limit: <= 400 square feet (Applicable classification-specific exclusions and standards apply.)
“In order to be occupied, a tiny home must comply with the standards of, and be approved as one of the following types of structures: a HUD-Code manufactured home (MH), California Residential Code or California Building Code home, factory-built housing (FBH), recreational vehicle (RV), park trailer (PT) or camping cabin (CC).”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
2 more reviewed findings on this topic
- Allowed (with conditions) — Tiny homes located in Lassen County, depending on whether the structure qualifies as an RV, park trailer, manufactured home, factory-built housing, camping cabin, or a site-constructed California Building Standards Code dwelling.
  “In order to be occupied, a tiny home must comply with the standards of, and be approved as one of the following types of structures: a HUD-Code manufactured home (MH), California Residential Code or California Building Code home, factory-built housing (FBH), recreational vehicle (RV), park trailer (PT) or camping cabin (CC).”
  Information Bulletin 2016-01: Tiny Homes ↗Re-checked Oct 4, 2026
- Limited — Tiny homes used for occupancy in California, including Lassen County
  “In order to be occupied, a tiny home must comply with the standards of, and be approved as one of the following types of structures: a HUD-Code manufactured home (MH), California Residential Code or California Building Code home, factory-built housing (FBH), recreational vehicle (RV), park trailer (PT) or camping cabin (CC).”
  Information Bulletin 2016-01 Tiny Homes ↗Re-checked Oct 5, 2026
Manufactured homesAllowed (with conditions)
Occupancy of manufactured homes inside or outside mobilehome parks in California.
- The manufactured home must satisfy applicable federal standards and California Manufactured Housing Act and Title 25 requirements.
- Installation and approval for occupancy are governed by the Mobilehome Parks Act.
- HCD or a local enforcement agency with assumed Mobilehome Parks Act authority is responsible for ensuring compliance with statutory construction and maintenance requirements.
- Local agency approvals may be necessary for the project.
minimum width for a new manufactured home: >= 8 body feet (The statutory definition also includes units at least 40 body feet in length.) · minimum erected floor area for a new manufactured home: >= 320 square feet
“MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
Well permitRequired
Construction, modification, or destruction of water wells in California.
- The permit is obtained from the applicable local environmental health agency or local water district before construction, modification, or destruction.
- Local enforcing agencies may adopt ordinances that meet or exceed DWR Well Standards.
- If no local well ordinance is adopted, the local enforcing agency must enforce the Statewide Model Well Ordinance.
- Water wells supplying public water systems have additional State Water Resources Control Board Division of Drinking Water certification requirements.
- Water-well construction must be performed by a licensed C-57 Well Drilling Contractor.
“Well owners need to obtain permits from local environmental health agencies or local water districts before construction, modification, or destruction takes place.”
Well Standards ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Limited — Construction, alteration, maintenance, or destruction of water wells, monitoring wells, cathodic protection wells, and geothermal heat exchange wells in California.
  “Permitting and enforcement are carried out by the LEAs, such as the County Department of Environmental Health.”
  Well Standards ↗Re-checked Sep 9, 2026
Mandatory utility hookupSewer (with conditions)
Certain existing OWTS in California Tier 3 impaired-water-body areas that commit to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The OWTS must have been constructed and operating, or permitted, on or before the date the nearby water body was added to OWTS Policy Attachment 2.
- The owner must commit by legally binding document to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The owner must sign the legally binding document within 48 months after the nearby water body's initial listing on Attachment 2.
- The specified connection date may not extend beyond nine years after the date the nearby water body is added to Attachment 2.
- The rule is an exception to Section 10 requirements for qualifying existing or permitted systems; it is not a general statewide requirement that every property connect to public sewer.
deadline to sign connection commitment: 48 months (Measured from the date the nearby water body is initially listed on Attachment 2.) · maximum time to complete connection: <= 9 years (Measured from the date the nearby water body is added to Attachment 2.)
“The owner must sign the document within forty-eight months of the date that the nearby water body is initially listed on Attachment 2. The specified date for the connection to the centralized community wastewater collection and treatment system shall not extend beyond nine years following the date that the nearby water body is added to Attachment 2.”
2023 OWTS Policy ↗Re-checked Sep 26, 2026
Agricultural exemptionConditional
Group U agricultural buildings subject to the California Wildland-Urban Interface Code in designated fire-hazard or wildland-urban-interface areas.
- The agricultural building must be a Group U occupancy agricultural building as defined in California Building Code Section 202.
- The agricultural building may be of any size but must be located at least 50 feet (15,240 mm) from an applicable building.
- The cited WUI application identifies State Responsibility Areas and Local Responsibility Areas identified by the State Fire Marshal as High or Very High Fire Hazard Severity Zones, as well as land designated by cities or other local agencies as a High or Very High Fire Hazard Severity Zone or Wildland-Urban Interface Area.
- This is an exception from the stated WUI-code application, not a general exemption from local building, zoning, septic, well, or other permit requirements.
minimum separation from applicable building: >= 50 feet (Group U occupancy agricultural building; source also states 15,240 mm.)
“Group U occupancy agricultural buildings, as defined in Section 202 of the California Building Code of any size located at least 50 feet (15 240 mm) from an applicable building.”
State Fire Marshal EF 01/25 Part 7 Emergency Rulemaking Readoption ↗Re-checked Nov 4, 2026
Shed and accessory-building permit exemptionConditional
One-story detached accessory structures covered by California Residential Code Section R105.2 or California Building Code Section 105.2.
- The structure must be one story and detached.
- The floor area must not exceed 120 square feet.
- The permit exemption does not authorize work that violates the code or any other law or ordinance of the jurisdiction.
- Local planning, zoning, fire, utility, and other approvals may still apply.
maximum floor area: <= 120 square feet (One-story detached accessory structure.)
“The provision of Item 1, “Work exempt from permit,” under the 2021 IRC, allows one-story detached accessory structures to be exempt from a permit, provided the floor area does not exceed 200 square feet (18.58 m²). HCD proposes to continue adoption of the California amendment retaining the exemption at a maximum of 120 square feet of floor area.”
HCD 06-21 Part 2.5 Initial Statement of Reasons ↗Re-checked Nov 4, 2026
Driveway accessRequired
Driveways and driveway connections involving proposed encroachments within, under, or over State highway rights of way.
- The requirement applies to proposed activities related to placement of encroachments within, under, or over State highway rights of way.
- Applications are submitted to the appropriate District Encroachment Permits Office having jurisdictional authority over the site.
- Local or other agency requirements may also apply outside State highway rights of way.
“An encroachment permit must be obtained for all proposed activities related to the placement of encroachments within, under, or over the State highway rights of way.”
Encroachment Permits | Caltrans ↗Re-checked Sep 26, 2026
Building in a floodplainRequired
Buildings and structures in special flood hazard areas in California, administered through local floodplain ordinances and the California Building Standards Code (Title 24)
- Flood-prone communities adopt local ordinances that detail floodplain development rules; the community's ordinance and/or building codes control over DWR's guide.
- Title 24 Part 2 Appendix G (flood-resistant construction) must be locally adopted and re-adopted each time a new code edition is adopted.
- Many communities adopt higher standards than the NFIP minimum (e.g., freeboard, cumulative substantial improvement).
- 2025 Title 24 edition has effective date January 1, 2026 per BSC; DWR page references the 2019 edition excerpts, so the current flood provisions edition was not directly quoted.
“please note that appendix g must be re-adopted each time the california building standards commission adopts a new edition of the building code.”
National Flood Insurance Program - California Department of Water Resources ↗Re-checked Nov 6, 2026
One more reviewed finding on this topic
- Limited — Land uses and development within a Central Valley Flood Protection Board-adopted designated floodway.
  “Land uses within an adopted designated floodway are restricted to not impede the free flow of water in the floodway or jeopardize public safety (23 CCR Section 107). In general, activities such as agriculture, grazing, and recreation are allowed, as are structures and activities that can be quickly and easily removed or pose little impedance to river flow. The CVFPB has the authority to determine additional permitted uses within the floodway on a case-by-case basis.”
  2022 State Plan of Flood Control Descriptive Document ↗Re-checked Nov 4, 2026
Campground & park staysLimited
Occupancy and use of manufactured homes and mobilehomes in California mobilehome parks and other locations subject to HCD jurisdiction.
- HCD administers titling and registration for manufactured homes and mobilehomes.
- HCD-inspected mobilehome parks are subject to health and safety enforcement where local government has not assumed enforcement.
- Manufactured/mobilehome park regulations address construction, use, maintenance, and occupancy.
- Separate local land-use, building, fire, health, and utility requirements may apply.
“MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
Manufactured & Mobilehomes ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Limited — Occupancy and use of recreational vehicles in California special occupancy parks and designated RV sections of mobilehome parks.
  “Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
county zoning authorityGeneral
California county legislative bodies' authority to adopt zoning ordinances regulating buildings, structures, land uses, lots, yards, open space, lot coverage, intensity of use, parking, loading, and setbacks within county jurisdiction, including unincorporated areas.
- The authority is exercised pursuant to Government Code Chapter 4, Zoning Regulations.
- The statute separately authorizes city legislative bodies; incorporated municipalities may exercise their own zoning authority.
- Government Code Section 65850 also lists authority to regulate signs and billboards, building and structure location, height, bulk, number of stories, and size, lot and open-space size and use, lot coverage, intensity of land use, offstreet parking and loading, and building setback lines.
- The cited section states it was amended by Stats. 2017, Ch. 376, Sec. 1, effective January 1, 2018.
“The legislative body of any county or city may, pursuant to this chapter, adopt ordinances that do any of the following:”
California Government Code Section 65850 ↗Re-checked Sep 21, 2026
county building authorityGeneral
California counties administering and enforcing state building standards through county building departments, including residential construction in unincorporated areas.
- Each county must maintain building standards and state building regulations in the office of the building official responsible for administration and enforcement of state building standards.
- The statewide Title 24 standards apply subject to statutory exceptions and any authorized local amendments or local requirements.
- The cited HCD bulletin concerns the 2019 California Building Standards Code and its July 1, 2021 supplement; later code editions may supersede those particular edition dates.
“These codes shall be maintained in the office of the building official responsible for the administration and enforcement of state building standards”
Information Bulletin 2021-02: 2019 California Building Standards Code Supplement ↗Re-checked Sep 26, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Lot coverage — Lot coverage limits in unincorporated Lassen County.
Short-term rentals — Short-term rental use in Lassen County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Lassen County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from California’s water agency.

Actively managed

This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.

Household wellPermit required — restricted

California requires no STATE permit for a domestic well — wells are permitted by the county — but under SGMA a Groundwater Sustainability Agency can meter or restrict new wells in medium/high-priority and critically overdrafted basins, and Executive Order N-7-22 requires counties in those basins to get GSA verification that a new well is consistent with the Groundwater Sustainability Plan before permitting.

Limit: 2 acre-feet/year de minimis under SGMA (Water Code §10721(e)) — largely exempt from GSA metering/fees

California DWR / State Water Board — SGMA de minimis & EO N-7-22 Action 9 FAQ ↗

Big Valley Basin (5-004, Lassen-Modoc) — Medium Prioritypartial of county
Medium-priority SGMA basin (DWR 2019 Basin Prioritization) requiring an adopted Groundwater Sustainability Plan; a new well is subject to GSA consistency review under Executive Order N-7-22. De minimis domestic wells (<2 af/yr) are generally exempt from GSA metering but still need a county permit.
California DWR — SGMA Basin Prioritization (2019) ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the California state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Lassen County, California

Is Lassen County a good place to live off-grid or homestead?

Lassen County scores 54/100 on the Bolthole Index, a solid county profile. Its strengths: deep seclusion — about 2,231 people within 15 miles and manageable long-term carry cost. Watch-outs: elevated current hazard exposure and thin water margin (19.7″/yr rainfall).

How much does land cost in Lassen County, California?

Land in Lassen County runs about $4,493 per acre, based on the latest county data.

What is the water situation in Lassen County?

Lassen County gets about 19.7" of rain a year, with severe drought in roughly 43.1% of years. On water rights, Lassen County lies in the Big Valley Basin (5-004, Lassen-Modoc) — Medium Priority — Medium-priority SGMA basin (DWR 2019 Basin Prioritization) requiring an adopted Groundwater Sustainability Plan; a new well is subject to GSA consistency review under Executive Order N-7-22. De minimis domestic wells (<2 af/yr) are generally exempt from GSA metering but still need a county permit..

How remote is Lassen County?

A typical private-land location has about 2,231 people within 15 miles and 778,420 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and land rules in Lassen County, California