San Juan County, NM Building Permits, Zoning & Septic Rules

Unincorporated San Juan County, New Mexico requires a county building permit for a home, and the county will not issue it until the site has a verified E-911 address¹. The county does not have comprehensive countywide zoning, although limited land-use rules and municipal jurisdiction can still apply². Septic permits and inspections go through the New Mexico Environment Department's local field office³⁴.

At a glance

Building permit: Required in unincorporated San Juan County, issued by the county Building Department¹
Zoning: No comprehensive countywide zoning; only limited land-use ordinances apply outside city extraterritorial areas²
Septic permit: New Mexico Environment Department (state), not the county; county requires 0.75 acres minimum per system⁵
Owner-builder: Homeowner's permit available for a principal residence, applied for in person; no contractor's license needed⁶
Tiny home: Allowed on a permanent foundation if built to the state residential code; up to 400 sq ft excluding lofts⁷
Manufactured home: Allowed with a state installation permit (valid 180 days); local placement rules still apply⁸
Land division exemption: Parcels of 35 acres or more, used agriculturally for 3+ years, are exempt from state subdivision review⁹
Septic soils: About 22.5% of the county's soils carry no severe rating for a conventional drain field¹⁰

Who to call

Building permits

San Juan County Building Department (Community Development)

Building permits and inspections for unincorporated San Juan County, plus rural addressing, subdivision/land-division review, floodplain permits, mobile home permits, and county-road driveway permits

(505) 334-4313

100 South Oliver, Aztec, NM 87410

Septic permits

New Mexico Environment Department, Farmington Field Office (Liquid Waste Program)

On-site liquid waste (septic) system permits and inspections for San Juan County, under the state Liquid Waste Program

505-566-9741

[email protected]

1800 E 30th St, Suite B, Farmington, NM 87401

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in San Juan County, New Mexico?

Yes: unincorporated San Juan County requires a building permit for a home, issued by the county Building Department, and the permit will not issue without a verified E-911 physical address¹. The county ordinance index records that San Juan County adopted and amended the Uniform Building Code, but it does not establish the current operative edition or how the ordinance applies within municipalities¹¹. New Mexico's residential code requires a permit before covered construction, alteration, repair, moving or demolition begins; narrow exceptions include a one-story tool or storage shed no larger than 120 square feet and a fence no taller than 6 feet¹². Ask the county Building Department which current code edition and trade permits govern the exact parcel and project.

Who is the San Juan County building department, and how do you reach them?

The San Juan County Building Department, part of Community Development, handles building permits for unincorporated San Juan County¹. Reach the office at (505) 334-4313; the county's main address is 100 South Oliver, Aztec, NM 87410¹³. The county page also lists rural addressing at (505) 334-4314, land divisions at (505) 334-4248, floodplain and mobile-home permits at (505) 334-4719, county-road driveway permits at (505) 334-4530, and state or U.S. highway driveway permits at (505) 476-4223¹³. Building-permit fees vary with construction type, floor area, materials and project cost, so obtain a project-specific amount before budgeting¹⁴. A driveway onto a state highway requires a New Mexico Department of Transportation access permit before construction or modification¹⁵.

Does San Juan County have zoning?

No: San Juan County has no comprehensive countywide zoning ordinance for unincorporated land; only limited land-use ordinances exist, such as rules for manufactured-home parks, and the county has considered but not adopted a broader land-use ordinance (LUDMO) after facing opposition². New Mexico law lets a county adopt zoning for any territory outside a municipality's zoning jurisdiction, but it does not require a county to do so unless a petition signed by at least twenty-five percent of the votes cast for governor in the last general election forces the county commission to act within a year¹⁶. That absence of countywide zoning does not mean every acre is unrestricted, though: land close to Farmington can fall under that city's extraterritorial zoning even while sitting outside city limits, and the city of Aztec and city of Bloomfield each zone inside their own boundaries, reachable at (505) 334-7605 and (505) 632-6319²¹³.

How do septic permits work in San Juan County?

The New Mexico Environment Department, not San Juan County, handles applications for on-site liquid-waste systems through its local field office³. An application must include ownership documentation, a site diagram, bedroom information for a home or fixture information for a commercial project, and applicable site details; NMED may approve it, approve it with conditions, or deny it, with payment due after approval¹⁷. A conventional system designed for up to 1,000 gallons per day carries a published $225 permit fee, and fees rise with design flow and system type¹⁸. Conventional review may take up to 5 business days for completeness and 10 business days for a decision¹⁹. Request inspection 48 hours, or 2 business days, ahead and do not cover the system; NMED issues the permit to operate after approval⁴. The county calls for at least 0.75 acres per system, while only about 22.5% of county soils lack severe limits for a conventional drain field⁵¹⁰. Reach the Farmington Field Office at 505-566-9741²⁰.

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

We could not confirm a specific San Juan County ordinance on living in an RV on private land in the sources reviewed for this guide; with no countywide zoning ordinance to check, this is worth confirming directly with the county Building Department before you plan on it¹³². A tiny house is a defined, allowed structure under New Mexico's statewide code, if it sits on a permanent foundation, provides full living, sleeping, eating, cooking and sanitation facilities, and is inspected for compliance with the state residential code; the state caps a tiny house at 400 square feet excluding lofts, with an 6 feet 8 inch minimum ceiling height in living space⁷. A tiny house still sitting on a chassis with its axle in place is legally a recreational vehicle instead, and must meet RV codes and licensing until the axle is removed⁷. Manufactured homes are allowed statewide with a state installation permit, valid for 180 days, obtained before installation, though local siting rules still decide whether a given unincorporated San Juan County parcel can have one⁸.

Building a home in San Juan County: the steps, in order

Get a verified E-911 physical address; San Juan County will not issue the building permit without one¹.
Ask the Building Department whether municipal or limited land-use rules affect the parcel, because San Juan County does not have comprehensive countywide zoning².
Submit the septic application and supporting ownership, site and dwelling information to the NMED Farmington Field Office³¹⁷²⁰.
After NMED approval, pay the septic fee; a conventional system designed for up to 1,000 gallons per day is listed at $225¹⁸.
Apply to the county Building Department and request a project-specific fee; an owner building a principal residence may seek an in-person homeowner permit without a contractor's license⁶¹⁴¹³.
Obtain the appropriate driveway approval before work, including an NMDOT access permit for a state highway connection¹⁵.
Arrange NMED's septic inspection 48 hours, or 2 business days, before it is needed, leave the system uncovered, and obtain the permit to operate after approval⁴.

What to check before you buy land in San Juan County

San Juan County is high desert: annual precipitation runs only about 8.9 inches, the county has spent roughly 50.7% of years in severe drought, and just 7.2% of the land is wooded, so water availability is worth researching well before soil quality²¹²²²³. About 25.2% of the county is federal land, a meaningful share for a buyer checking whether a parcel borders public land managed differently than private property²⁴. Terrain is workable for building: about 68.5% of the county sits at 15% slope or less²⁵. Distance and money: the county sits roughly 125 straight-line miles from the nearest city of 100,000 or more people, the effective property tax rate is about 0.7% with a median annual bill near $1,249, and typical home insurance runs about $1,197 a year²⁶²⁷²⁸²⁹.

Watch-outs

San Juan County has no comprehensive zoning ordinance for unincorporated land, and a proposed countywide land-use ordinance (LUDMO) has faced opposition and was not in force as of this guide's research; check the county Building Department for the current status before assuming no rules will ever apply².
Land near Farmington can fall under that city's extraterritorial zoning even while it sits outside the city limits, so confirm with the county or the city before assuming 'no county zoning' means no zoning at all².
We could not confirm a San Juan County-specific rule on living in an RV on private land; ask the Building Department directly before you count on it¹³.

Sources

Written September 29, 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.

How San Juan County scores

Seclusion62100% ev.

Self-Sufficiency20100% ev.

Admin Boringness60100% ev.

Durability49100% ev.

Property Autonomy38100% ev.

Carry Cost85100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$278kTypical home

0.7%Property tax

$745Land / acre

8.9"Annual rain

50.7% of yrsSevere drought

10.3 / yr (+9.4)Mid-century 100°F days

37.5 daysMid-century dry spell

0.63" (+3.7%)Mid-century 1-day rain

1.18×Wildfire change factor

100%Forward climate coverage

$1,197Home insurance / yr

-1.1% / yrInsurance growth

0.87%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

141,637People within 2 hr

41,401Radius comparison (15 mi)

21.9People / sq mi

25.2%Federal land

68.5%Land at 15% slope or less

22.5%Septic soil without severe limits

764,021 acWorkable land screen

7.2%Wooded land

19 tonsBiomass / forest ac

52°FAvg temp

Answers from the rulebook for San Juan County

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

San Juan County rules

Building code adoptedAdopted (with conditions)
County building-code adoption evidenced by the county ordinance index
- The opened ordinance index identifies Ordinance 9 as adopting and amending the Uniform Building Code; the current operative code edition and applicability by municipality were not established from the opened source.
“Ordinance 9: Adopting The Uniform Building Code - Amended”
County Ordinances ↗Re-checked Sep 26, 2026
County-wide zoningAbsent
San Juan County has no comprehensive countywide zoning for unincorporated areas; only limited land-use ordinances exist (e.g., manufactured home parks, Farmington extraterritorial zoning), and a proposed countywide land-use ordinance (LUDMO) has faced opposition.
San Juan County Ordinances ↗Scouted from the county site, not yet independently re-checked
Owner-builder exemptionAvailable
If the home is the owner's principal residence, a homeowner's permit may be obtained to construct or alter the residence without a contractor's license (permit still required, applied for in person).
San Juan County Building Department ↗Scouted from the county site, not yet independently re-checked

New Mexico rules that apply here

Building permitRequired
Buildings and structures regulated by the New Mexico Residential Code, including residential construction, alterations, repairs, additions, moves, improvements, removals, conversions, and demolitions, and state-administered commercial construction.
- A permit must be obtained before covered work begins.
- Residential exceptions include one-story detached accessory buildings used as tool or storage sheds, playhouses, and similar uses not exceeding 120 square feet; fences not over 6 feet high; specified retaining walls; certain water tanks, sidewalks, driveways, finish work, shallow prefabricated pools, playground equipment, window awnings, and detached decks.
- Unless otherwise exempted, separate plumbing, electrical, and mechanical permits may still be required for otherwise exempted residential work.
- Commercial applicants must be validly licensed with the appropriate license classification, submit the state building permit application, obtain any required city or county zoning approval, and pay the valuation-based fee before permit issuance.
residential accessory-building exemption floor area: <= 120 square feet (One-story detached accessory buildings used as tool and storage sheds, playhouses, and similar uses.) · fence exemption height: <= 6 feet · water-tank exemption capacity: <= 5000 gallons (Height-to-diameter or width ratio must not exceed 2:1.) · detached-deck exemption area: <= 200 square feet (Deck must not be more than 30 inches above grade, must not be attached to a dwelling, and must not serve the required exit door.)
“Except as specified in Section 105.2 IRC, no building or structure regulated by this code shall be erected, constructed, enlarged, altered, repaired, moved, improved, removed, converted, or demolished unless a permit has first been obtained from the building official.”
Building Permit Guide for Residential Construction ↗Re-checked Sep 12, 2026
InspectionsRequired
State-administered residential and commercial construction requiring building permits.
- Residential inspections include foundation, concrete slab or under-floor, frame, weather-resistive barrier, and final inspection.
- Final electrical, plumbing, and mechanical inspections must occur before the final general construction inspection.
- The building official or Construction Inspector may require additional inspections to establish compliance with the New Mexico Building Code and other enforced laws.
- Inspection requests require the permit number, inspection type, requestor contact information, and confirmation that work is complete and the permit is affixed near the front exterior door.
“REQUIRED INSPECTIONS To request an inspection e-mail us at [email protected] or call 505-222-9813 or 877-243-0979”
Building Permit Guide for Residential Construction ↗Re-checked Sep 12, 2026
Tiny homesAllowed (with conditions)
Tiny houses used as single dwelling units with complete independent living facilities and placed on a permanent foundation statewide in New Mexico.
- The unit must provide permanent provisions for living, sleeping, eating, cooking, and sanitation.
- The tiny house must comply with the New Mexico Residential Code and Appendix AQ.
- Tiny houses constructed in New Mexico or transported into New Mexico must be inspected for compliance with New Mexico Residential Code requirements.
- A tiny house on a chassis with a permanent axle is treated as a recreational vehicle and must meet recreational-vehicle codes and licensing requirements while the axle remains in place.
- If axles are removed and the unit is placed on supports or a foundation, it must comply with the code requirements for tiny houses on a permanent foundation.
- The rule applies to construction, use, and occupancy subject to the jurisdiction of the Construction Industries Division; construction not addressed in the residential code must comply with the New Mexico Commercial Building Code.
maximum floor area excluding lofts: <= 400 square feet (The definition excludes loft area and excludes recreational vehicles.) · minimum habitable-space and hallway ceiling height: >= 6 feet 8 inches (Loft ceiling heights may be lower.) · minimum bathroom, toilet-room, and kitchen ceiling height: >= 6 feet 4 inches (None stated in the cited passage.)
“This appendix shall be applicable to tiny houses used as single dwelling units providing complete independent living facilities for one or more persons”
14.7.3 NMAC — 2021 New Mexico Residential Building Code ↗Re-checked Sep 12, 2026
Manufactured homesAllowed (with conditions)
Installation and resulting residential use and occupancy of new or pre-owned manufactured homes statewide in New Mexico, subject to the Manufactured Housing Division's permitting and inspection rules.
- An installation permit or combined installation and permanent-foundation inspection permit must be obtained before installation.
- The permit must identify the licensees performing installation work and the consumer's name and address; a map is required when the address is a post-office box or rural route.
- An unlicensed homeowner working on the homeowner's own principal residential property must perform the work personally or use division-approved licensees, execute the required acknowledgment, and assume responsibility for applicable federal, state, local, code, and inspection requirements.
- Final inspection must certify that the manufactured home meets the minimum standards for use and occupancy under the act and regulations.
- Permits are valid for 180 days, subject to possible time extension for weather or re-manufacturing or permanent-foundation inspections.
- Each new or pre-owned manufactured home installed in New Mexico requires an installation permit.
- Failure to obtain a permit subjects the homeowner, dealer, or installer to a fine of double the permit fee.
- Local requirements, codes, and inspections still apply; the cited state rule does not establish local land-use placement or zoning permission.
installation permit validity: 180 days (A time extension may be granted for weather-related delay or inspections involving a home being re-manufactured or installed on a permanent foundation.) · permit for certain alteration, modification, or repair: 15 USD (Available upon written request and excludes warranty work performed under a previous permit and installation.) · fine for installation without permit: double the permit fee (Applies to the homeowner, dealer, or installer.)
“inspectors shall certify on the permit, or upon any inspection report, that the manufactured home meets the minimum standards for use and occupancy”
14.12.9 NMAC — Inspections ↗Re-checked Sep 12, 2026
Who permits septicState
On-site liquid waste systems and effluent receiving 5,000 gallons or less per day and not requiring a discharge plan or NPDES permit.
- 20.7.3 NMAC identifies the New Mexico Environmental Improvement Board as the issuing agency and defines the department as the New Mexico Environment Department.
- More stringent city or county requirements may also apply.
maximum regulated flow: <= 5000 gallons per day (Systems requiring a discharge plan under 20.6.2 NMAC or an NPDES permit are outside this part.)
“20.7.3.1 ISSUING AGENCY: New Mexico Environmental Improvement Board.”
20.7.3 NMAC — Liquid Waste Disposal and Treatment ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- State (with conditions) — Onsite wastewater permitting affecting San Juan County
  “Submit to Local NMED Field Office for review”
  Apply for a Permit ↗Re-checked Sep 26, 2026
Septic permitRequired
Installation or modification of a new or existing on-site liquid waste system, including residential or commercial units on lots for which such a system is required.
- A permit issued by the New Mexico Environment Department, including payment of the permit fee, is required before construction or modification.
- A permit is not required for graywater discharges or systems meeting 20.7.3.810 NMAC.
- A dwelling may not be constructed, modified, or transported onto a lot requiring an on-site liquid waste system unless the department has issued the permit beforehand.
- Other state, city, county, or federal approvals may also be required.
- The department generally acts within 10 working days after a completed conventional-system application, subject to the rule's extension for potentially more stringent requirements.
maximum regulated flow: <= 5000 gallons per day (20.7.3.2 NMAC scope limitation) · permit application completeness determination: 5 working days (Conventional systems) · conventional permit decision: 10 working days (After receipt of a completed application; review may extend to 20 working days when more stringent requirements may be necessary)
“No person shall install or have installed a new on-site liquid waste system or modify or have modified an existing on-site liquid waste system, unless that person obtains a permit issued by the department, including payment of the permit fee, prior to construction of such installation or modification.”
20.7.3.401 NMAC — Permitting; General Requirements ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Required — Installation or modification of onsite liquid-waste systems serving property in San Juan County
  “Application – Print and fill out an Application for Liquid Waste Permit, Section 20.7.3.401 NMAC”
  Apply for a Permit ↗Re-checked Sep 26, 2026
Septic inspectionRequired
NMED inspection of onsite liquid-waste systems in San Juan County
- Inspection must be requested from NMED 48 hours, or two business days, in advance.
- The system must not be covered before inspection.
- A Permit to Operate is issued after approved inspection.
inspection notice: 48 hours (two business days)
“Request Inspection by NMED 48 hours (2 business days) in advance (DO NOT COVER BEFORE INSPECTION)”
Apply for a Permit ↗Re-checked Sep 26, 2026
Off-grid sanitationLimited
Privies, permitted on-site liquid waste systems, and qualifying private residential graywater discharges statewide.
- A privy may dispose of human excreta and toilet paper but not other liquid wastes.
- Untreated liquid waste must go to a permitted and approved enclosed system, permitted and approved treatment unit, or public sewer, except qualifying graywater.
- Graywater under 250 gallons per day may be used for household gardening, composting, or landscaping irrigation only if all listed conditions are met, including no runoff, no spraying, no watercourse discharge, floodway exclusion, five-foot groundwater separation, local ordinance compliance, 24-hour storage limit, and specified well setbacks.
- Graywater use for purposes other than irrigation or composting requires a department permit.
private residential graywater discharge: < 250 gallons per day (Qualifying graywater discharge under 20.7.3.810 NMAC) · graywater setback from private domestic well: >= 100 feet · graywater setback from public water supply well: >= 200 feet · graywater storage before discharge: <= 24 hours
“A privy may be used for the disposal of human excreta and toilet paper, but not for the disposal of other liquid wastes.”
20.7.3 NMAC — Liquid Waste Disposal and Treatment ↗Re-checked Sep 12, 2026
Mandatory utility hookupConditional
Residential and commercial units using an on-site liquid waste system when a public sewer is available and connection is required by the local authority with jurisdiction.
- A public sewer is deemed available when it has capacity and is located in a thoroughfare, right-of-way, or easement abutting the lot.
- The on-site system must be properly abandoned within 30 days after connection.
- The state rule does not itself identify which local authority will require connection.
abandonment deadline after sewer connection: 30 days
“All residential and commercial units utilizing an on-site liquid waste system shall connect to a public sewer upon availability and if required in accordance with the local authority that has jurisdiction.”
20.7.3 NMAC — Liquid Waste Disposal and Treatment ↗Re-checked Sep 12, 2026
Agricultural exemptionConditional
Statewide agricultural exemption from the New Mexico Subdivision Act for the sale, lease, or other conveyance of a parcel of at least 35 acres.
- The parcel must be thirty-five acres or larger.
- The conveyance must occur within a twelve-month period covered by the statutory exception.
- The land must have been used primarily and continuously for agricultural purposes, in accordance with Section 7-36-20 NMSA 1978, for the preceding three years.
minimum parcel size: >= 35 acres · agricultural use duration: >= 3 years (land must have been used primarily and continuously for agricultural purposes in accordance with Section 7-36-20 NMSA 1978) · conveyance period: 12 months (within any twelve-month period)
“the sale, lease or other conveyance of any parcel that is thirty-five acres or larger in size within any twelve-month period; provided that the land has been used primarily and continuously for agricultural purposes, in accordance with Section 7-36-20 NMSA 1978, for the preceding three years;”
Senate Bill 176 — New Mexico Subdivision Act ↗Re-checked Sep 12, 2026
Subdividing landRegulated (with conditions)
Division of land statewide in New Mexico into two or more parcels for sale, lease, other conveyance, or building development, subject to the New Mexico Subdivision Act and its statutory exceptions.
- The source defines subdivision as division of a surface area of land, including land within a previously approved subdivision, into two or more parcels for sale, lease or other conveyance or for building development, whether immediate or future.
- The Act contains exceptions, including certain agricultural conveyances, grazing or farming divisions, municipal-boundary divisions, family transfers, divisions creating no parcel smaller than 140 acres, and other listed exceptions.
“The board of county commissioners of each county shall regulate subdivisions within the county's boundaries.”
Senate Bill 176 — New Mexico Subdivision Act ↗Re-checked Sep 12, 2026
Driveway accessRequired
Permanent or temporary direct vehicular access from property in close proximity to or adjoining a New Mexico state highway.
- An access permit must be issued by the New Mexico Department of Transportation before constructing or modifying covered access.
- Access permits are issued only when the application complies with 18.31.6 NMAC.
- The department or an approved issuing authority may impose terms and conditions.
- The rule concerns state highways under the jurisdiction of the state transportation commission; it does not establish a universal permit requirement for every non-state roadway.
- For additional traffic from expansion or redevelopment, the property owner must contact the department to determine whether a new application or access modification is required; no new application is required if the department determines modifications are unnecessary.
“no person shall construct or modify any permanent or temporary access [...] without an access permit issued by the New Mexico department of transportation.”
18.31.6 NMAC ↗Re-checked Sep 12, 2026
Building in a floodplainRequired
Construction or development within a FEMA Special Flood Hazard Area in a New Mexico community, and proposed construction or other development in communities where FEMA has not defined a Special Flood Hazard Area.
- Approval by the local community Floodplain Administrator is required before construction or development within any Special Flood Hazard Area.
- Where FEMA has not defined the Special Flood Hazard Area, the community must require permits for all proposed construction or other development, including manufactured homes, to determine whether the activity is in a flood-prone area.
- Approval is intended to ensure compliance with the National Flood Insurance Program and the community’s floodplain management ordinance.
- The source identifies 104 New Mexico communities participating in the National Flood Insurance Program; the administering official is the applicable local community Floodplain Administrator, not the state agency.
“Approval by the local community Floodplain Administrator is required before construction or development begins within any Special Flood Hazard Area.”
Flooding ↗Re-checked Sep 12, 2026
Permit feesPublished (with conditions)
New Mexico liquid-waste permit fees applicable to systems in San Juan County
- The page identifies the fee schedule as effective July 1, 2020.
- Fees vary by system type and design flow.
- The page states that the table was prepared April 9, 2020.
conventional system design flow up to 1000 gpd: 225 USD (effective 7/1/20) · conventional system design flow 1001 to 2000 gpd: 325 USD (effective 7/1/20) · conventional system design flow 2001 to 5000 gpd: 500 USD (effective 7/1/20) · re-inspection fee: 125 USD (effective 7/1/20)
“Conventional system, register, construct, or modify design flow up to 1,000 gpd | 7/1/20 | $225.00”
Apply for a Permit ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Variable (with conditions) — New Mexico Construction Industries Division permitting fees for covered construction work statewide.
  “Permitting Fees are based upon type of construction, square footage, type of materials and construction costs.”
  Construction Industries Forms and Applications Fees ↗Re-checked Sep 12, 2026
Permit processPublished (with conditions)
New Mexico liquid-waste permit process applicable to systems in San Juan County
- Applications are submitted to a local NMED field office.
- Conventional systems may take up to five business days for completeness review and ten business days for a decision.
- Advanced treatment systems may take up to ten business days for completeness review and twenty business days for a decision.
- A variance process may require at least twenty days for public notification and review.
- Appeals must be filed in writing with the NMED Secretary within 15 working days after notice of NMED action.
conventional completeness check: <= 5 business days · conventional decision: <= 10 business days · advanced treatment completeness check: <= 10 business days · advanced treatment decision: <= 20 business days · appeal deadline: <= 15 working days (after notice of NMED action)
“Conventional Systems may take up to five (5) business days for completeness check and ten business (10) days to return a decision.”
Apply for a Permit ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Published (with conditions) — Construction Industries Division permit applications in New Mexico.
  “Permits can also be completed using our online permitting portal.”
  Forms and Applications ↗Re-checked Sep 12, 2026
county zoning authorityGeneral
New Mexico counties may adopt zoning ordinances for all or any portion of county territory that is not within a municipality's zoning jurisdiction.
- The county zoning authority's ordinance applies only to territory not within the zoning jurisdiction of a municipality.
- Municipalities may have concurrent extraterritorial zoning authority in specified circumstances, including population-based distances, overlapping extraterritorial jurisdictions, and additional territory placed under municipal jurisdiction by county-municipal agreement.
- Concurrent municipal authority is exercised pursuant to an extraterritorial zoning authority or joint powers agreement and may be exercised whether or not the county has enacted a comprehensive zoning ordinance.
- In the absence of a county zoning ordinance, a qualified-elector petition signed by at least twenty-five percent of votes cast for governor at the preceding general election may require the board of county commissioners to adopt a county zoning ordinance within one year.
“A. a county zoning authority may adopt a zoning ordinance applicable to all or any portion of the territory within the county that is not within the zoning jurisdiction of a municipality;”
Senate Bill 241, Final Version ↗Re-checked Sep 21, 2026
county building authorityLimited
New Mexico counties that qualify as an authority having jurisdiction may administer permitting, inspection, and enforcement for residential construction in unincorporated areas and enforce applicable New Mexico construction codes.
- A county must have a full-service building department employing a full-time certified building official and have permitting, inspection, and enforcement authority over general construction, electrical, and mechanical-plumbing trades.
- A county established as an authority having jurisdiction before July 1, 2009 may continue with authority over specified trades without a full-service building department until it relinquishes that authority.
- Construction work subject to the Construction Industries Licensing Act and applicable rules requires the applicable permit before construction or specified installation, alteration, repair, maintenance, or demolition work begins, unless an applicable statute or rule provides otherwise.
- The statewide rule is effective March 10, 2022, unless a later date is cited at the end of a section.
- A permit may be issued to a homeowner only subject to the limitations of 14.5.2.18 NMAC and an annual permit under 14.5.2.19 NMAC.
““Authority having jurisdiction” “AHJ” means the state or a municipality, county or other political subdivision that has a full-service building department employing a full-time certified building official and has permitting, inspection and enforcement authority over the general construction, electrical and mechanical-plumbing trades within its jurisdiction.”
14.5.1 NMAC, Construction Industries General Provisions ↗Re-checked Sep 21, 2026

Still unanswered

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

Certificate of occupancy — Certificates of occupancy for buildings in unincorporated San Juan County
Local zoning — Local zoning within San Juan County, including incorporated municipalities and any other local jurisdictions
Zoning districts — Published zoning districts or zoning maps in San Juan County
Minimum dwelling size — Minimum dwelling size in San Juan County
Minimum lot size — Minimum lot size in San Juan County

8 more unanswered

Setbacks
Lot coverage
Building height
Living in an RV
Camping on your land
Accessory dwellings
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 San Juan County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from New Mexico’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 (issued by right)

Nearly all developed New Mexico lies inside an OSE 'declared' underground water basin, but a household 72-12-1.1 domestic well is a by-right permit the State Engineer issues even in closed/over-appropriated basins (metering can be required). The by-right amount is cut to 0.25 acre-ft/yr in a declared Domestic Well Management Area, and a few basin-specific orders cap it further (Gallup Order 197, Zuni Order 199) or stop issuing new domestic permits entirely (Hot Springs Order 198).

Limit: 1 acre-ft/yr by right (NMSA 72-12-1.1); 0.25 acre-ft/yr in a declared Domestic Well Management Area

NM OSE domestic well rules, 19.27.5 NMAC ↗

San Juan Underground Water Basinpartial of county
OSE-declared Article-7 groundwater basin; new non-domestic (72-12-3) appropriations require an OSE permit showing unappropriated water. The 72-12-1.1 household domestic well remains by-right — no Domestic Well Management Area is declared in New Mexico. San Juan (Colorado River) system in NW NM, governed by the Upper Colorado compacts and the Navajo Nation water-rights settlement.
NM OSE Article 7 (Declared Underground Water Basins) ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the New Mexico state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in San Juan County, New Mexico

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

San Juan County scores 46/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and about 41,401 people within 15 miles. Watch-outs: weak self-sufficiency basics: only 8.9″ of rain a year, in severe drought 50.7% of years and a weaker property-autonomy legal backdrop.

Do you need a building permit in San Juan County, New Mexico?

San Juan County generally requires a residential building permit, and it has no county-wide zoning. Onsite septic is permitted by New Mexico Environment Department (NMED) Liquid Waste Program. 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 San Juan County, New Mexico?

Land in San Juan County runs about $745 per acre, based on the latest county data.

What is the water situation in San Juan County?

San Juan County gets about 8.9" of rain a year, with severe drought in roughly 50.7% of years. On water rights, San Juan County lies in the San Juan Underground Water Basin — OSE-declared Article-7 groundwater basin; new non-domestic (72-12-3) appropriations require an OSE permit showing unappropriated water. The 72-12-1.1 household domestic well remains by-right — no Domestic Well Management Area is declared in New Mexico. San Juan (Colorado River) system in NW NM, governed by the Upper Colorado compacts and the Navajo Nation water-rights settlement..

How remote is San Juan County?

A typical private-land location has about 41,401 people within 15 miles and 429,896 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and septic rules in San Juan County, New Mexico

At a glance

Who to call

Do you need a building permit in San Juan County, New Mexico?

Who is the San Juan County building department, and how do you reach them?

Does San Juan County have zoning?

How do septic permits work in San Juan County?

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

Building a home in San Juan County: the steps, in order

What to check before you buy land in San Juan County

Watch-outs

Sources

San Juan County in New Mexico

How San Juan County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for San Juan County

San Juan County rules

New Mexico rules that apply here

Still unanswered

Water rights & wells in San Juan County

Living off-grid in San Juan County, New Mexico

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

Do you need a building permit in San Juan County, New Mexico?

How much does land cost in San Juan County, New Mexico?

What is the water situation in San Juan County?

How remote is San Juan County?

How San Juan compares in New Mexico