Off-grid site report
Irion County, TX
31.2840, -100.8119 · 2,169 ft elevationRead this before you act on anything below. This is my researched starting point for Irion County, TX, 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 rulesIrion County, TX
Zoning & raw-land occupancy
Unclear - verifyNo Irion County zoning ordinance was found; Texas counties generally lack broad zoning power over unincorporated land, so the state baseline of minimal county authority applies. The county's only cited land-use document is 'Subdivision Regulations 2025,' which covers platting, not zoning. source
Dwellings, tiny homes & RVs
Unclear - verifyNo official Irion County page addresses tiny homes, minimum dwelling size, or RV occupancy. Texas counties have had only narrow authority to regulate this since 2009, so the state baseline applies by default.
Building permits & codes
Unclear - verifyNo building permit process, adopted building code, or floodplain administrator page was found on the county's official site; confirm directly with Irion County government whether any permit is required. source
Septic & composting toilets
RestrictedSeptic (OSSF) systems are regulated statewide by TCEQ under Health & Safety Code Chapter 366 and 30 TAC Chapter 285, requiring a permit unless you qualify for the 10+ acre single-dwelling exemption. It's not confirmed whether Irion County or TCEQ's regional office directly issues these permits locally. source
Greywater reuse
Unclear - verifyNo standalone greywater rule was found for the state or Irion County; greywater appears to be handled within the same OSSF/30 TAC 285 framework as septic.
Rainwater harvesting
Generally allowedNo Irion County restriction on rainwater harvesting was found, and Texas generally encourages it at the state level.
Private wells & water rights
RestrictedThe Irion County Water Conservation District covers the entire county and requires a permit for non-exempt wells, with state-mandated spacing rules and a permit that expires within six months unless extended. source
Living disconnected from utilities
Unclear - verifyNo county or Mertzon city ordinance requiring utility hookup was found, so living off-grid from electric, water, or sewer utilities appears unrestricted, but this is based on an absence of published rules rather than a confirmed policy.
Sun30-year normals
- Peak-sun hours, annual average
- 6.0 hrs/day
- Worst month (sizes an off-grid array)
- 4.9 hrs/day
- Yearly output per 1 kW of panels
- 1,680 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 21 in/yr
- Snowfall
- 2 in/yr
- Heating degree days
- 2,317 (mild)
- Frost-free season
- Mar 26 to Nov 11
How far help isstraight-line
- Hospital
Shannon South Emergency Room - 22.2 mi
- Fire station
- none within range
- Hardware store
Lowe's - 20.6 mi
- Grocery
Walmart Supercenter - 20.4 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 76941).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Irion County, TX?The rules above are the jurisdiction. The land check runs the parcel itself: flood zone, soils and septic suitability, wetlands, slope, access, climate, and these verdicts, from a parcel number or coordinates.
Check a parcel →Share or save this report:New report
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 21, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.
New here, or not sure where this fits? Start here walks through the whole thing in order.