Off-grid site report
Washington County, OK
36.7403, -95.9346 · 745 ft elevationRead this before you act on anything below. This is my researched starting point for Washington County, OK, not legal advice and not a guarantee. Rules change, and the deciding facts on any specific parcel (setbacks, perc results, overlay districts, deed restrictions, road frontage) live at the county or town office, not in any database. Before you buy land or build, confirm the current rules directly with the local zoning and health offices - the sources on this page tell you exactly who to call.
The local rulesWashington County, OK
Zoning & raw-land occupancy
Unclear - verifyNo official Washington County zoning ordinance or map was found online. The Town of Washington is separately updating its own zoning map, showing zoning here is set at the municipal level, not countywide. Confirm directly with the county or relevant town. source
Dwellings, tiny homes & RVs
Unclear - verifyNo official county page addresses tiny homes, RVs, or minimum dwelling size. Likely governed by whatever building authority has jurisdiction, or by municipal code inside town limits; not confirmed for unincorporated county land.
Building permits & codes
Varies locallyOklahoma's Uniform Building Code Commission (OUBCC) sets a statewide minimum code (IBC, IFC, IMC, IPC, etc.), enforced locally. Washington County's specific adopted edition or amendments were not confirmed on an official page. source
Septic & composting toilets
RestrictedOklahoma DEQ regulates all on-site sewage systems statewide, requiring an Authorization to Construct, a certified soil profile, and DEQ approval for alternative systems like composting toilets. The county health department is the local contact for coordination. source
Greywater reuse
Generally allowedNo Washington County-specific greywater ordinance was found, so the state statute is the operative rule as a baseline.
Rainwater harvesting
Generally allowedNo Washington County-specific rainwater harvesting ordinance was found, so state rules apply as a baseline.
Private wells & water rights
Generally allowedWell siting, construction, and water sampling are governed by state DEQ/OWRB rules, with the county health department coordinating locally. No county-specific well ordinance beyond that was confirmed. source
Living disconnected from utilities
Unclear - verifyNo official Washington County document confirms whether grid hookup is required for occupancy approval. Oklahoma has no statewide mandate to connect to utilities, but this is not confirmed specifically for this county.
Sun30-year normals
- Peak-sun hours, annual average
- 5.2 hrs/day
- Worst month (sizes an off-grid array)
- 3.9 hrs/day
- Yearly output per 1 kW of panels
- 1,494 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 43 in/yr
- Heating degree days
- 4,141 (moderate)
How far help isstraight-line
- Hospital
Jane Phillips Medical Center - 0.9 mi
- Fire station
Washington County Fire Department - 0.3 mi
- Hardware store
Lowe's - 0.9 mi
- Grocery
Walmart Supercenter - 0.2 mi
From OpenStreetMap. Road miles will be longer, often much longer in hill country.
Plan this spot
These open with this location's real numbers already filled in (ZIP 74006).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
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Sources: US Census Bureau geocoder; NLR PVWatts v8 (solar); NOAA NCEI 1991-2020 climate normals (nearest station) or Open-Meteo (ZIP-centroid) for weather; Open-Elevation; OpenStreetMap contributors. Public data retrieved Aug 22, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.