Off-grid site report
Johnston County, OK
34.4887, -96.6258 · 1,030 ft elevationRead this before you act on anything below. This is my researched starting point for Johnston 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 rulesJohnston County, OK
Zoning & raw-land occupancy
Unclear - verifyNo countywide zoning ordinance or planning department could be found on Johnston County's official site. Confirm with the County Commissioners' office whether unincorporated land is zoned at all; incorporated towns like Tishomingo may have their own rules.
Dwellings, tiny homes & RVs
Unclear - verifyNo county ordinance on tiny homes, minimum dwelling size, or RV living was found. Oklahoma has no statewide tiny-home law, so this is a local question the county or town would need to answer directly.
Building permits & codes
Unclear - verifyNo Johnston County building-permit office or adopted code was located officially. The state's Uniform Building Code Commission sets a baseline, but county-level enforcement is not confirmed.
Septic & composting toilets
RestrictedSeptic systems in Oklahoma are regulated statewide by the Department of Environmental Quality, which requires a permit and soil evaluation. No separate Johnston County health department page was found, so applicants likely work directly with DEQ.
Greywater reuse
Generally allowedNo Johnston County restriction was found beyond the state baseline; Oklahoma law allows residential greywater reuse for irrigation without a permit below a statutory volume threshold.
Rainwater harvesting
Generally allowedNo Johnston County ordinance restricts rainwater catchment; the state treats non-potable rooftop collection as unregulated.
Private wells & water rights
Generally allowedPrivate domestic wells are governed by state groundwater law and the Oklahoma Water Resources Board, not by any Johnston County ordinance found in this research.
Living disconnected from utilities
Unclear - verifyNo county ordinance mandating grid or water hookup was found. Incorporated towns like Tishomingo may set their own utility-connection rules separate from county government.
Sun30-year normals
- Peak-sun hours, annual average
- 5.3 hrs/day
- Worst month (sizes an off-grid array)
- 4.1 hrs/day
- Yearly output per 1 kW of panels
- 1,508 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 44 in/yr
- Heating degree days
- 3,173 (moderate)
How far help isstraight-line
- Hospital
Mercy Hospital Tishomingo - 18.6 mi
- Fire station
- none within range
- Hardware store
The Home Depot - 20.8 mi
- Grocery
Dollar General Market - 17.9 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 74836).
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.