Off-Grid Living in Navajo County, Arizona

I researched off-grid living rules across eight key areas for Navajo County and found that while the county permits some off-grid practices, it requires strict compliance with building codes, zoning enforcement, and permit systems. Several important rules remain county-undefined and are instead governed by Arizona state law. Here's what I learned and what you need to do next.

Zoning: Know Your Parcel Category Before You Buy

Navajo County enforces a countywide Zoning Ordinance administered by Planning and Development Services. The county uses zone categories including A-General and Rural, but zoning varies significantly across the county. Your first step must be to confirm whether your specific parcel is zoned for residential use, agricultural use, or something else - and whether your intended off-grid project is a permitted use in that zone.

If you want to build a primary dwelling on a parcel zoned Rural, that is typically allowed, but if you plan a mixed-use project (say, a residence plus an agricultural operation or small business), you may need a Special Use Permit. If your parcel's current zoning does not accommodate your use, you can pursue a zoning variance or zone change, but both require county approval and public notice - a process that can take weeks or months.

Contact Navajo County Planning and Development Services early. They will review your parcel ID, tell you the current zone, and clarify whether your intended use is permitted by right, conditionally permitted, or prohibited. This step is non-negotiable and inexpensive; skipping it can lead to investing in a project that the county will later deny.

Building Your Own Home: Code Compliance Is Mandatory

Navajo County allows you to build your own primary dwelling if you meet all federal, state, and local building codes and pass county inspections. This is not a blanket permission to build however you want. The county adopts the 2018 International Residential Code (IRC) and 2018 International Building Code (IBC), plus county-specific addenda.

In practical terms, this means your foundation, framing, electrical, plumbing, and mechanical systems must all be code-compliant. You must obtain a building permit before breaking ground, and the county will inspect at key stages: foundation, framing, rough-in, and final. You cannot occupy the dwelling until you receive a Certificate of Occupancy from the county.

Owner-building is allowed, but many off-gridders hire a contractor for portions they cannot do themselves (electrical, plumbing, HVAC) to ensure code compliance and pass inspections smoothly. The county website does not explicitly discuss conversion of existing structures (sheds, outbuildings) into dwellings - the emphasis is on new construction meeting code from the start. If you have an existing outbuilding you want to adapt, ask Planning and Development Services whether it must be retrofitted to meet 2018 IRC standards or whether the county allows adaptive reuse with modified requirements. This is unconfirmed locally and worth clarifying in writing.

Tiny homes are not explicitly prohibited, but Navajo County has not published a tiny-house policy. Arizona state law defers to counties on tiny homes; some Arizona counties (such as Cochrane) set minimums of 296 square feet, while others cap them at 600 square feet. Contact Planning and Development Services to ask whether there is a minimum or maximum dwelling footprint that applies to your project. If the county has no formal tiny-home rule, ask for confirmation in writing so you have a record.

Septic Systems: Permits and Soil Testing Required

Navajo County permits conventional septic systems and requires a soil test specific to your property before system design. Your system must pass county inspection before you can use it. Arizona state law (ADEQ) requires septic systems on unincorporated land to generally sit on at least one acre and maintain a 100-foot setback from private wells. If your property is smaller or the well is closer, you will need a variance or alternative system.

The county does not explicitly prohibit alternative systems like composting toilets on its website, but it also does not formally approve them either. Arizona state law allows composting toilets that meet NSF 41 certification, but Navajo County may have additional requirements or inspections. Before ordering a composting toilet, contact Planning and Development Services to confirm that the county will accept it on your parcel and what inspections are needed. Get this approval in writing.

If you are building on marginal soils (clay, rock, very shallow groundwater), the soil test may show that a conventional septic system won't work, and you will need to invest in a more expensive alternative, such as a raised mound system or aerobic treatment system. Budget for this possibility if your land is in challenging terrain.

Well Permits: Two-Agency Checkpoint

Well drilling in Navajo County requires permits from both Navajo County and, in many cases, the Arizona Department of Water Resources (ADWR). Navajo County administers local well permits. ADWR has jurisdiction over groundwater in Active Management Areas (AMAs), and even outside AMAs, ADWR tracks large groundwater users.

Here is the practical sequence: First, apply for a Navajo County well permit and provide a site plan. Second, if your project is larger than 5 acres or uses significant groundwater, you must also file with ADWR and submit a preliminary water resource study. ADWR's study requirement can take months and may require a hydrogeologist's involvement, adding cost and time.

Outside AMAs, you are generally allowed one domestic well up to 35 gallons per minute and no more than ten acre-feet per year without an ADWR permit. But if you are selling water, irrigating more than one acre, or serving more than one household, you will exceed that threshold and need state permits. Check with ADWR before drilling; ADWR's website has a tool to see whether your parcel is in an AMA or not. This is one of the most commonly overlooked steps and can result in a well being declared illegal after completion.

Greywater: State Rules Apply, County Policy Unconfirmed

Navajo County has not published county-specific greywater rules in publicly available sources. However, Arizona state law (ADEQ) allows greywater reuse statewide under a tiered permit system. Systems producing less than 400 gallons per day for uses like landscape irrigation - from shower, sink, and washing machine water - generally require no permit. Larger systems and potable reuse require permits and inspections.

Crucially, Arizona state law prohibits counties from imposing additional requirements beyond ADEQ's standards. This means Navajo County cannot ban greywater systems that meet state rules, but the county may have local inspectors who verify compliance. Contact Planning and Development Services to ask which county office inspects greywater systems (likely the building department or health department) and what documentation they require. A 25% state tax credit (up to $1,000) is available for system installation, so keep receipts if you move forward.

If you build a greywater system, get county approval before installing it. Use a design that meets ADEQ guidelines and keep records of your system layout, plumbing, and inspection results.

Rainwater Harvesting: Legal Statewide, County Rules Unconfirmed

Arizona state law fully permits residential roof rainwater collection with no permit, registration, or state-imposed volume limit. You can collect rainwater and use it for non-potable purposes (landscape, livestock) without asking anyone.

However, Navajo County's official sources do not address rainwater harvesting. It is possible that the county has no specific rules (meaning state law applies), or the county may have local guidance that is not yet published online. If you plan a large system or potable use (drinking water), contact Planning and Development Services to ask whether the county has any permitting or inspection requirements. If you intend to treat rainwater for potable use, you will likely need a permit and inspections from a county health or building official; potable rainwater is treated more stringently than non-potable use.

For a basic non-potable system (gutters, storage tank, landscape use), you can install it on your property without county approval, but having county confirmation of this in writing is wise to avoid any future disputes.

Grid Disconnection and Off-Grid Power: Unconfirmed Locally

Navajo County does not publish a specific rule explicitly permitting or prohibiting off-grid power systems (solar, battery, wind). One county source mentioned that utilities cannot supply grid power to a vacant property until valid primary dwelling and septic permits are approved, but that applies to grid connections, not off-grid systems.

Arizona state law does not require connection to a municipal grid on rural or unincorporated parcels, and solar-only homes are generally accepted in rural Arizona. This suggests that Navajo County likely permits off-grid power, but the county has not officially confirmed this.

If you plan to build completely off-grid (solar, battery backup, no grid connection), contact Planning and Development Services before investing heavily in solar equipment. Ask whether the county has any rules on battery backup, microhydro, or wind generation, and whether you need a separate electrical permit for off-grid systems. In my research, I found no county-specific prohibition, but I also found no explicit approval - get clarity in writing from the county before finalizing your electrical plan.

Building Permits and the Inspection Process

All new construction in Navajo County requires a building permit from the county. To obtain one, you will need to submit a completed Construction Permit Application, site plan (showing property lines, proposed structure location, well location if applicable, and septic system location), and proof of zoning compliance. The county will review these documents and issue the permit.

Once you have a permit, you are responsible for scheduling inspections at each critical phase. Missing an inspection or proceeding without one voids the permit and creates liability. The county may assess penalty fees for code violations or unpermitted work, and if you have to stop and correct work, the delays and costs add up quickly.

Navajo County Planning and Development Services is the point of contact for all building and zoning questions. They also administer the Zoning Ordinance, review permit applications, and conduct inspections.

Pulling It All Together: Your Pre-Construction Checklist

Before you break ground on any off-grid project in Navajo County, do the following in this order:

1. Confirm zoning: Submit your parcel ID to Planning and Development Services and ask for a zoning letter stating whether your intended use is permitted by right, conditionally permitted, or prohibited.

2. Request written clarification on unconfirmed areas: Greywater, rainwater, composting toilets, tiny-home size limits, and off-grid power. Get responses in writing.

3. Commission a soil test: If you plan septic or foundation construction, have a professional soil test done. Share results with the county to confirm septic feasibility.

4. File for well and water permits: If you need a well, apply to Navajo County and, if applicable, ADWR. Do not drill without permits.

5. Apply for a building permit: Submit your site plan, building plans, and other required documents.

6. Schedule and pass inspections: Coordinate with the county to inspect at each phase (foundation, framing, rough-in, final). Do not skip any inspection.

Throughout this process, Planning and Development Services is your primary contact. Keep a file of all correspondence and approvals; they are your proof that your project met all requirements.

Arizona State Rules That Override or Supplement County Policy

Remember that Navajo County is subject to Arizona state law on water, septic, and certain building matters. ADEQ (Arizona Department of Environmental Quality) regulates septic, greywater, and onsite wastewater systems. ADWR (Arizona Department of Water Resources) regulates well drilling and groundwater use. These agencies' rules may be stricter than county rules and will supersede any conflicting county policy. If you encounter a conflict between county guidance and state rules, state law prevails.

The bottom line: Navajo County permits off-grid living but requires advance permits, code compliance, and zoning confirmation. Many specific rules are unconfirmed at the county level, meaning state law applies - contact both the county and relevant state agencies before investing in your project.