Bolthole Index

Adams County, Washington

Building permits, zoning and land rules in Adams County, Washington

40Index Score / 100
#35 of 39 in Washington

Building permits are required for building projects in unincorporated Adams County, Washington, and the county Building Department reviews the applications.1 Adams County also has county zoning, while Environmental Health handles on-site sewage review and permitting.23

At a glance

Building permit
Required for building projects in unincorporated Adams County1
Zoning
County zoning and land-use review apply2
Septic
Adams County Environmental Health administers on-site sewage review3
RV living
Private-land occupancy limits were not confirmed; ask Planning before relying on an RV as housing4
Tiny home
Washington permits code-compliant tiny houses, subject to local siting and permits5
Owner-builder
A conditional contractor-registration exemption exists, but permits still apply6
Minimum home size
State code sets interior-space minimums; confirm any zoning standard with Planning7

Who to call

Building permits

Adams County Building & Planning

Building permits, plan review, inspections and planning questions

509-488-9441

449 E Cedar Boulevard Othello, WA 99344

Online permits →

Septic permits

Adams County Health Department

On-site sewage site registration and sewage-permit applications

(509) 488-2031

425 E MAIN STE 700, OTHELLO, WASHINGTON 99344

Roads & driveways

Adams County Public Works

County-road maintenance and approach questions

(509) 659-3276

[email protected]

210 W. Alder Ave. Ritzville, WA 99169

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

Do you need a building permit in Adams County, Washington?

Yes. The Adams County Building Department reviews permit applications for building projects in unincorporated Adams County.1 The department also reviews projects in Lind, Hatton and Washtucna, but an application in one of those towns needs town approval first; Ritzville routes submissions through the city even though the county provides plan review and inspections.1

County submittals must be complete for acceptance and include the application forms, a site plan, complete construction drawings, design criteria and the master fee schedule.8 Construction is inspected through its various phases, and current submittals are reviewed under the Washington State Codes adopted by the county.910 Do not assume a small project is exempt: Washington allows a narrow local option for certain low-value work, but the county-specific applicability must be confirmed with Building & Planning.11

Who issues building permits in Adams County, and how do you reach them?

Adams County Building & Planning is the first stop for a project in the county building jurisdiction. The Building Division enforces the Washington State Building Code, and its Othello office handles questions by phone at the contact listed above.12 The county publishes an online permit route through CloudPermit, and its permit process requires a complete package before acceptance.8

The Building Division reviews plans and performs inspections, while Planning handles zoning, land-use applications and parcel-specific use questions.92 An owner may qualify for Washington's contractor-registration exemption when working on their own property, unless the work is for selling, demolishing or leasing the property; that exemption does not erase building, septic or trade permits.6 For a permit-history search, contact Building & Planning with the parcel number and property address.

Does Adams County have zoning?

Yes. Adams County Planning administers county zoning and processes rezones, variances, special-use permits and subdivisions.2 The county publishes a zoning code and map, so a parcel's district—not a general description such as rural or agricultural—controls the allowed uses and dimensional standards.13

Washington's building code establishes interior-space minimums for regulated dwellings, but those are not a county zoning minimum for total house size.7 The available county material did not confirm a universal minimum dwelling size, lot-coverage limit or zoning height limit, so ask Planning for the parcel's district standards before choosing a house plan. A subdivision or short subdivision must also satisfy state law and applicable local land-use controls.14 Temporary growing structures used solely for horticultural production have a limited state building-code exemption, but that is not a general exemption for homes, barns or other agricultural buildings.15

How do septic permits work in Adams County?

Adams County Health Department's Environmental Health program administers on-site sewage review in the county.3 The county's site-registration form can be used with a sewage-permit application and a system design that meets applicable requirements.16

Washington requires an application and local-health-officer permit before installing, repairing, modifying, connecting to or expanding an on-site sewage system, except for a minor repair.17 The application addresses the water source, sewer availability, parcel size, utilities, soil and site evaluation, site plan and system design.17 Soil conditions are a real budgeting issue: about 41% of mapped county soils lack severe limits for a conventional drain field, so a parcel-level evaluation matters before purchase.18 The county's complete local exceptions were not confirmed; ask Environmental Health whether the proposed work needs a permit and what design documentation the site requires.

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

Adams County's private-land RV occupancy and temporary-camping limits could not be confirmed, so ask Planning about the parcel's zoning and the proposed duration before treating an RV as construction housing or a residence. Washington's definition of an RV in the manufactured-home-community context describes temporary, transient living quarters that are not used as a primary residence, but that definition does not grant general permission to live in an RV on private land.4

A Washington tiny house may be built on wheels, may be no larger than 400 square feet and must meet the Washington State Building Code; foundation, installation and location approval still depend on local permits and requirements.5 Adams County's current tiny-home siting rule was not confirmed, so take a proposed floor plan and parcel number to Building & Planning before ordering or moving a unit. Do not use state-park camping limits as a private-land rule.

Building a home in Adams County: what are the steps?

  1. Ask Adams County Planning to identify the parcel's zoning district and confirm that the home, accessory uses and site layout are allowed.2
  2. Confirm potable water and septic feasibility with Environmental Health; an on-site sewage application requires site and design information before covered construction begins.17
  3. Resolve access. A new approach to a county road requires county permission, while an approach on a state-highway right-of-way requires written state approval.1920
  4. Prepare a complete building-permit package with the application, site plan, construction drawings, design criteria and fee information.8
  5. Submit to Building & Planning and complete required inspections as work progresses.9
  6. If the parcel is in a floodplain, obtain the local floodplain development permit before development work.21 Ask Building & Planning whether a certificate of occupancy is required for the specific project because a general county rule was not confirmed.

What should you check before buying land in Adams County?

Start with zoning, legal access, water and septic rather than relying on the listing description. Adams County Planning maintains the zoning map and code, and Environmental Health evaluates sewage and potable-water issues for land development.133 A private-well permit or approval path was not confirmed, so ask Environmental Health and the applicable state water office before assuming a well can serve the parcel.

Check the proposed driveway early. A county driveway may serve no more than 2 residences; a driveway longer than 150 feet must be at least 20 feet wide and include an approved fire-apparatus turnaround, while one shorter than 150 feet must be at least 16 feet wide.22 Floodplain development requires a local permit, and local standards can exceed federal minimums.21 For carrying-cost context, the effective property-tax rate is about 0.8%, and the median annual property-tax bill is about $2,104.2324

Watch-outs

  • Private-land RV occupancy, temporary camping and the current county tiny-home siting rule were not confirmed; the statewide RV definition does not grant private-land siting permission, so ask Adams County Planning before buying land for one of those uses.4
  • Only about 41% of mapped soils lack severe limits for a conventional septic drain field, so complete site evaluation before treating a parcel as buildable.18
  • A long county driveway can trigger width and fire-apparatus turnaround requirements that materially affect site cost.22

Sources

  1. Permitting, quoted and re-checked
  2. Planning Division, quoted and re-checked
  3. Adams County Code — Ch. 13.06 On-Site Sewage Systems (2026 county census)
  4. RCW 59.30.020 — Definitions (Washington statewide rule), quoted and re-checked
  5. Tiny Houses (Washington statewide rule), quoted and re-checked
  6. RCW 18.27.090 Exemptions, quoted and re-checked
  7. WAC 51-50-1208 — Section 1208—Interior space dimensions (Washington statewide rule), quoted and re-checked
  8. Permitting, quoted and re-checked
  9. Building Division, quoted and re-checked
  10. Building Division, quoted and re-checked
  11. WAC 51-16-080 — Permit exemptions guideline (Washington statewide rule), quoted and re-checked
  12. Adams County Building & Planning (co.adams.wa.gov)
  13. Adams County Zoning Map & Codes, quoted and re-checked
  14. RCW 58.17.030 — Subdivisions to comply with chapter, local regulations (Washington statewide rule), quoted and re-checked
  15. RCW 19.27.065 — Exemption—Temporary growing structures used for production of horticultural plants (Washington statewide rule), quoted and re-checked
  16. Adams County Health Department (co.adams.wa.gov)
  17. WAC 246-272A-0200 Permit requirements (Washington statewide rule), quoted and re-checked
  18. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  19. RCW 36.75.130 — Approaches to county roads—Rules regarding construction—Penalty (Washington statewide rule), quoted and re-checked
  20. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
  21. Planning & regulation — Washington State Department of Ecology (Washington statewide rule), quoted and re-checked
  22. Permitting, quoted and re-checked
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data

Written September 27, 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.

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County locator

Adams County in Washington

40
County map
Adams County highlighted among the Washington counties · colored by Index score

How Adams County scores

Seclusion62100% ev.
Self-Sufficiency1492% ev.
Admin Boringness41100% ev.
Durability65100% ev.
Property Autonomy50100% ev.
Carry Cost81100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$310kTypical home
0.8%Property tax
$2,133Land / acre
11.5"Annual rain
13.6% of yrsSevere drought
13.7 / yr (+10.2)Mid-century 100°F days
37.6 daysMid-century dry spell
0.49" (+6.6%)Mid-century 1-day rain
1.16×Wildfire change factor
100%Forward climate coverage
$1,384Home insurance / yr
2% / yrInsurance growth
0.8%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
15,347People within 30 min
1,614,770People within 2 hr
2,912Radius comparison (15 mi)
10.8People / sq mi
1.8%Federal land
69.3%Land at 15% slope or less
41%Septic soil without severe limits
503,582 acWorkable land screen
0.7%Wooded land
49.6°FAvg temp

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Answers from the rulebook for Adams County

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

Adams County rules

  • Building permitRequired

    Building projects in unincorporated Adams County.

    • The Building Department also reviews projects in Lind, Hatton, and Washtucna; town applications require prior town approval.
    • The City of Ritzville uses the city for submission processing even though the county provides plan-review and inspection services.
    “The Building Department reviews permit applications for all building projects in the unincorporated areas of Adams County as well as the Towns of Lind, Hatton and Washtucna.”
  • Building code adoptedAdopted (with conditions)

    Building projects within Adams County building-jurisdiction areas.

    • As of March 15, 2024, submittals are reviewed under the 2021 Washington State Codes, including the state Energy Code.
    • Requirements may change based on local, state, and federal law or policy and building-code cycles.

    code edition effective date: 2024-03-15

    “As of March 15, 2024 the 2021 Washington State Codes, including the state Energy Code went into effect. All submittals will be reviewed for compliance with the 2021 State Codes as adopted.”
  • InspectionsRequired

    Construction subject to Adams County building-code enforcement.

    • Inspections occur through the various phases of construction and requirements may change with applicable law, policy, and code cycles.
    “The county has employed International Code Council certified a Building Official, Inspectors and Plans Examiners to ensure that site inspections and construction documents are efficiently inspected and reviewed for code compliance through the various phases of construction.”
  • Local zoningPresent (with conditions)

    Adams County local zoning and land-use regulation, including unincorporated county areas; incorporated municipalities may administer their own local rules.

    • The county Planning Division administers county zoning and processes rezones, variances, special-use permits, and subdivisions.
    “The Planning Division develops and maintains the County’s land use regulations, including the Comprehensive Land Use Plan, Adams County Zoning, Development Code, and Shoreline Master Program.”
  • Zoning districtsPublished (with conditions)

    Adams County zoning districts and zoning-map information.

    • The county publishes a zoning code and map; the opened page did not reproduce the district schedule or dimensional standards.
    “Adams County Zoning Code and Map, updated August 2025”
  • Manufactured homesLimited

    Manufactured-home placement and occupancy in Adams County.

    • New manufactured-home placement permits require manufacturer blocking and tie-down requirements.
    • As of August 19, 2025, new manufactured-home placements are subject to ACC 17.76.070(D) and the county page states a greater-than-20-year limitation as measured from Washington Labor and Industries approval.
    • Used homes older than 20 years may be permitted in designated mobile-home parks, including pre-HUD homes; used homes moved into the county require a Washington Labor and Industries fire-life-safety inspection.
    • Reroofs and remodels to factory-assembled structures and manufactured homes require Washington Labor and Industries approval.

    new manufactured-home placement age threshold: > 20 years (measured from the date of approval from the Washington Department of Labor and Industries)

    “As of August 19, 2025 in accordance ACC 17.76.070(D) All new Manufactured Homes placements shall be greater than 20 years, as measured from the date of approval from the WA Department of Labor and Industries.”
  • Driveway accessRequired

    County driveways serving residences in unincorporated Adams County.

    • A driveway may serve no more than two residences.
    • A county driveway longer than 150 feet must be at least 20 feet wide and provide an approved fire-apparatus turnaround meeting IFC Appendix D.
    • A county driveway shorter than 150 feet must be at least 16 feet wide; no turnaround is required.

    maximum residences served: <= 2 residences · driveway width: >= 20 feet (driveway longer than 150 feet) · driveway width: >= 16 feet (driveway less than 150 feet)

    “A driveway shall serve no more than two residences. Any County driveway hereafter created longer than 150 feet in length shall have a width of no less than 20 feet and shall provide an approved fire apparatus turnaround meeting the requirements of the IFC Appendix D. County driveways less than 150 feet in length shall have a width of no less than 16 feet a turnaround is not required.”
  • Permit processPublished (with conditions)

    County building-permit applications for unincorporated Adams County and specified towns.

    • Applications may be submitted through the CloudPermit portal.
    • Submittals must be complete for acceptance and include application forms, site plan, complete construction drawings, design criteria, and the master fee schedule.
    • Incomplete construction drawings could result in denial of the application submittal.
    “The Building Department permit submittal process requires all permit submittals to be complete for acceptance. Before submitting make sure your permit submittal includes.”
  • County-wide zoningPresent

    The county Planning Division maintains Adams County Zoning and the Development Code and processes rezones, variances, and special use permits under GMA.

    Adams County - Planning Division ↗Scouted from the county site, not yet independently re-checked

  • Who permits septicAdams County Health Department — Environmental Health

    Adams County Code Chapter 13.06 On-Site Sewage Systems establishes the county health officer's authority over septic/OSS permits; a residence must have a septic permit or Existing System Evaluation from the county Environmental Health Department.

    Adams County Code — Ch. 13.06 On-Site Sewage Systems ↗Scouted from the county site, not yet independently re-checked

Washington rules that apply here

  • Owner-builder exemptionConditional

    An owner or other person performing construction-related contractor activities on the person's own property or personal residence under Washington contractor-registration law.

    • The exemption concerns registration provisions under chapter 18.27 RCW and does not itself eliminate applicable building, electrical, plumbing, mechanical, land-use, or inspection requirements.
    • For work on the person's own property, the exemption does not apply when the person performs contractor activities for the purpose of selling, demolishing, or leasing the property.
    • For an owner contracting with a registered contractor, the exemption does not apply to a person performing contractor activities to lease or sell improved property owned for less than twelve months.

    small-project contract threshold: < 500 USD (The threshold exemption does not apply when the work is part of a larger operation, contracts are divided to evade the chapter, or the person advertises as a contractor.)

    “The registration provisions of this chapter do not apply to: [...] (12) Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
    One more reviewed finding on this topic
    • Available (with conditions) — Contractor-registration requirements for persons working on their own property or personal residence in Washington, including Adams County.
      “(12) Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
  • Minimum dwelling sizeSpecified

    Dwelling units regulated by Washington's state building code.

    • The rule specifies habitable-space and room-area minimums, not a zoning minimum lot or gross floor-area standard.
    • Kitchens are expressly excepted from the minimum floor-area requirement.
    • Efficiency dwelling units must comply with Sections 1208.1 through 1208.4 and must have a separate closet, required kitchen facilities, light and ventilation, and a separate bathroom as stated in the source.
    • The current rule text states WSR 23-23-102 was filed 11/15/23 and effective 3/16/24.

    minimum habitable space: >= 190 square feet · minimum area of at least one room: >= 120 square feet · minimum net floor area of sleeping units and other habitable rooms: >= 70 square feet (Kitchens are not required to be of a minimum floor area.)

    “1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m 2) of habitable space. 1208.4 Room area. Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m 2) of net floor area. Sleeping units and other habitable rooms of a dwelling unit shall have a net floor area of not less than 70 square feet (6.5 m 2). EXCEPTION: Kitchens are not required to be of a minimum floor area.”
  • Building heightSpecified

    Buildings subject to Washington's state building code, with allowable height determined by occupancy classification and type of construction.

    • Table 504.3 is occupancy- and construction-type-specific.
    • The source states that Chapters 4 and 5 contain specific exceptions to the allowable height.
    • The table includes NS and UL entries; the source footnotes state that NS is only for evaluation of existing building height under the International Existing Building Code and that other entries have sprinkler-related conditions.

    allowable building height: occupancy-classification and construction-type specific values in Table 504.3 feet above grade plane (See Chapters 4 and 5 for specific exceptions.)

    “Allowable Building Height in Feet Above Grade Plane”
  • Tiny homesAllowed (with conditions)

    Occupancy and placement of tiny houses in Washington

    • A tiny house may be built on wheels and may not exceed 400 square feet including kitchen, bathroom, and sleeping/living area.
    • It must be built to the Washington State Building Code.
    • Approval depends on where it is built; local building-department requirements and permits apply to foundation, installation, and location.
    • A wheeled structure that is not a tiny house as described may instead be a recreational vehicle or park model.
    • A manufactured home, including a tiny manufactured home, requires consultation with the local building department regarding where it may be located.

    maximum area: <= 400 square feet

    “A tiny house is a dwelling that may be built on wheels and is no larger than 400 square feet, including a kitchen, bathroom, and sleeping/living area, and must be built to the Washington State Building Code. The approval process for a tiny house depends on where it's built.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in portions of Washington cities, towns, and counties located within designated urban growth areas and subject to the Growth Management Act requirements

    • Cities and counties planning under the chapter must adopt or amend ordinances and development, zoning, and other official controls to implement the statutory requirements.
    • The requirements apply only in portions of towns, cities, and counties within designated urban growth areas.
    • Local governments may still apply public-health, safety, building-code, environmental-permitting, on-site-wastewater, and generally applicable development regulations.
    • Local governments may restrict or prohibit ADUs where development is restricted because of on-site sewage infrastructure, critical areas, or other unsuitable physical characteristics.
    • Under RCW 36.70A.681, at least two ADUs must be allowed on qualifying lots in configurations specified by statute, subject to listed exceptions and limitations.
    • The statutory requirements do not apply to lots designated with critical areas or buffers, or to specified impaired or threatened potable-water-reservoir watersheds.

    minimum ADUs in qualifying configurations: >= 2 accessory dwelling units per qualifying lot (Applies to lots in all zoning districts within an urban growth area that allow single-family homes, subject to statutory exceptions.)

    “The city or county must allow at least two accessory dwelling units on all lots that are located in all zoning districts within an urban growth area that allow for single-family homes in the following configurations:”
  • Septic permitRequired

    Installation, repair, modification, connection to, or expansion of an on-site sewage system statewide.

    • A permit is not required for a minor repair.
    • For covered activities other than a minor repair, the application and permit must be obtained before construction begins.
    • The application includes the drinking-water source, sewer-utility status, parcel size, sewage source, utilities, soil and site evaluation, site plan, and detailed OSS design.
    • The local health officer responds within 30 days, may require additional information, may deny or revoke a permit for just cause, and may impose additional requirements necessary to protect public health.
    • A permit expiration date may not exceed five years from issuance.
    • The cited rule revision was filed March 1, 2024, and became effective April 1, 2025.

    permit response time: <= 30 days (As required in RCW 70.05.074.) · permit expiration: <= 5 years (From the date of permit issuance.)

    “Except for a minor repair, [...] shall submit an application and obtain a permit from the local health officer prior to beginning construction.”
  • Agricultural exemptionAvailable (with conditions)

    Temporary growing structures used solely for production of horticultural plants in Washington.

    • The exemption is limited to temporary growing structures.
    • The structures must be used solely for production of horticultural plants, including ornamental plants, flowers, vegetables, and fruits.
    • The statute states that a temporary growing structure is not considered a building or structure for purposes of chapter 19.27 RCW.
    • This is not a general exemption for residences or all agricultural buildings.
    “The provisions of this chapter do not apply to temporary growing structures used solely for the production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. A temporary growing structure is not considered a building or structure for purposes of this chapter.”
  • Subdividing landRegulated (with conditions)

    Subdivision and short subdivision of land in Washington, with approval administered by the city, town, or county legislative authority having jurisdiction.

    • Every subdivision must comply with chapter 58.17 RCW.
    • Every short subdivision must comply with applicable local regulations adopted under RCW 58.17.060.
    • A plat or short plat may not be approved unless the city, town, or county makes a formal written finding that the proposal conforms to applicable zoning ordinances or other land-use controls.
    • Local approval procedures and applicable local land-use controls must be checked for the particular property.
    “Every subdivision shall comply with the provisions of this chapter. Every short subdivision as defined in this chapter shall comply with the provisions of any local regulation adopted pursuant to RCW 58.17.060.”
  • Building in a floodplainRequired

    Development work on property located in a Washington floodplain.

    • The applicant must contact the local government to obtain the floodplain development permit.
    • Local governments manage floodplain development under the National Flood Insurance Program.
    • Some local governments impose standards higher than NFIP minimums, including regulation of areas larger than FEMA Flood Insurance Rate Maps show.
    • Washington counties and cities planning under the Growth Management Act must periodically review and update Critical Areas Ordinances addressing frequently flooded areas.
    “If you're planning to do any development work on a property located in a floodplain, contact your local government to obtain a floodplain development permit. Local governments are responsible for managing development in floodplains under the NFIP; however, some local governments have higher regulatory standards than the minimums of the NFIP, such as regulating a larger area than what is shown on Flood Insurance Rate Maps.”
  • Campground & park staysLimited

    Camping and temporary occupancy in Washington State Parks facilities

    • Camping is permitted only in areas specifically designated or marked for camping, or as directed by a ranger.
    • State park facilities may not be used for residence purposes.
    • Continuous occupancy is limited to no more than 10 nights in one park within a 30-day period and no more than 90 nights per calendar year in all state parks, subject to stated qualifications in WAC 352-32-280 and WAC 352-32-285.
    • Occupants must vacate by 1:00 p.m. when the applicable fee is unpaid, the occupancy limit expires, or the site is reserved by another party; an additional camping fee may apply after checkout.

    maximum stay in one park: <= 10 nights per 30-day period (Limitations do not apply to individuals qualifying under WAC 352-32-280 and WAC 352-32-285.) · maximum stay in all state parks: <= 90 nights per calendar year (Limitations do not apply to individuals qualifying under WAC 352-32-280 and WAC 352-32-285.) · checkout time: 1:00 p.m. (Applies when the fee is unpaid, the occupancy limit has expired, or the site is reserved by another party.)

    “The maximum length of stay shall be no more than 10 nights in one park within a 30-day period. Total nights stayed by the same camping party must not exceed 90 nights per calendar year in all state parks. These limitations shall not apply to those individuals who meet the qualifications of WAC 352-32-280 and 352-32-285.”
    One more reviewed finding on this topic
    • Limited — Recreational vehicles in the context of Washington's manufactured/mobile-home community statutes
      “(12) "Recreational vehicle" means a travel trailer, motor home, truck camper, or camping trailer that is primarily designed and used as temporary living quarters, is either self-propelled or mounted on or drawn by another vehicle, is transient, is not occupied as a primary residence, and is not immobilized or permanently affixed to a manufactured/mobile home lot.”
  • county zoning authorityGeneral

    Washington counties adopting zoning and related official controls for county jurisdiction, including unincorporated areas.

    • A county must create a planning agency as authorized in RCW 36.70.030 and RCW 36.70.040 before engaging in the chapter's planning program.
    • Zoning maps may be adopted only for areas covered by a comprehensive plan containing at least a land use element and a circulation element.
    • Zoning regulations may address land uses, building location and dimensions, yards and open spaces, population density, lot coverage, parking, and minimum gross floor area requirements for single-family detached dwellings.
    • The cited enabling provisions do not state a population threshold, named-county limitation, or special geographic limitation.
    “Any board, by ordinance, may establish classifications, within each of which, specific controls are identified, and which will regulate:”
  • county building authorityGeneral

    Washington counties requiring and enforcing building permits and adopting amendments to the state building code for residential construction within county jurisdiction, including unincorporated areas.

    • The state building code must be enforced by counties and cities within their jurisdictional boundaries.
    • A county without a building department must contract with another county, city, or approved inspection agency for enforcement.
    • County amendments may not diminish the minimum performance standards and objectives of the state building code.
    • Residential-building amendments are subject to approval by the state building code council under RCW 19.27.074(1)(b), except as provided by statute.
    • The building-permit definition incorporates exemptions in International Building Code section 105.2 and International Residential Code section R105.2.
    • Counties may adopt permit exemptions for certain specified R-3 or M-1 construction or alteration with total fair market value not exceeding $1,500, but the exemption does not remove substantive code standards.

    permit-exemption fair-market-value ceiling: <= 1500 USD (Applies only to certain construction or alteration of group R, division 3, or group M, division 1 occupancies under RCW 19.27.060(7); substantive code standards still apply.)

    “The state building code required by this chapter shall be enforced by the counties and cities. Any county or city not having a building department shall contract with another county, city, or inspection agency approved by the county or city for enforcement of the state building code within its jurisdictional boundaries.”

Still unanswered

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

  • Certificate of occupancy — Certificate-of-occupancy requirements for county building projects.
  • Lot coverage — Lot-coverage limits in Adams County zoning districts.
  • Living in an RV — RV occupancy on private land in Adams County.
  • Camping on your land — Temporary camping on private land in Adams County.
  • Off-grid sanitation — Off-grid sanitation and alternative sewage systems in Adams County.
2 more unanswered
  • Well permit
  • Short-term rentals

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 Adams County

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

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt up to a limit

RCW 90.44.050 exempts up to 5,000 gpd for domestic use, but the 2018 Streamflow Restoration Act caps NEW permit-exempt domestic wells at 3,000 gpd/connection in some basins and 950 gpd (350 gpd indoor in drought) in others, and new post-2020 wells in the adjudicating Nooksack basin are limited to ~500 gpd indoor.

Limit: 5,000 gpd base (RCW 90.44.050); capped to 3,000 or 950 gpd/connection in streamflow-restoration basins; ~500 gpd indoor for new Nooksack wells

Washington Dept of Ecology — Groundwater permit exemption ↗
  • Odessa Subarea (deep basalt aquifer decline)partial of county

    Columbia Basin deep basalt aquifer severely depleted (some wells ~2,400 ft, hot/high-sodium); Ecology's response is a Columbia River surface-water replacement program rather than a formal closure, but new large groundwater supply is practically unavailable.

    WA Dept of Ecology ↗

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 Washington state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Adams County, Washington

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

Adams County scores 40/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and mixed durability signals. Watch-outs: weak self-sufficiency basics: only 11.5″ of rain a year and more administrative friction around building and land use.

Do you need a building permit in Adams County, Washington?

Adams County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Adams County Health Department — Environmental Health. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Adams County, Washington?

Land in Adams County runs about $2,133 per acre, based on the latest county data.

What is the water situation in Adams County?

Adams County gets about 11.5" of rain a year, with severe drought in roughly 13.6% of years. On water rights, Adams County lies in the Odessa Subarea (deep basalt aquifer decline) — Columbia Basin deep basalt aquifer severely depleted (some wells ~2,400 ft, hot/high-sodium); Ecology's response is a Columbia River surface-water replacement program rather than a formal closure, but new large groundwater supply is practically unavailable..

How remote is Adams County?

A representative private-land location has about 15,347 people within a 30-minute drive and 1,614,770 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

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

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How Adams compares in Washington

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