Off-grid site report
Tom Green County, TX
31.4340, -100.4961 · 1,900 ft elevationRead this before you act on anything below. This is my researched starting point for Tom Green 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 rulesTom Green County, TX
Zoning & raw-land occupancy
Varies locallyTom Green County has no general zoning for unincorporated land, a statewide Texas norm, but the Commissioners Court has adopted Subdivision Regulations governing platting. Land inside San Angelo city limits or ETJ is separately zoned by the city. source
Dwellings, tiny homes & RVs
Varies locallyThe county has adopted specific rules for manufactured home rental communities, but no countywide minimum dwelling size or general tiny-home/RV occupancy standard for private acreage was confirmed. Ask the county for specifics on stand-alone RV or tiny home living. source
Building permits & codes
Unclear - verifyThe county requires plat compliance before construction under its Subdivision Regulations, but a comprehensive countywide building code (like IRC/IBC) for unincorporated areas was not confirmed. San Angelo enforces its own building code inside city limits. source
Septic & composting toilets
Generally allowedTCEQ is the state authority licensing on-site sewage facilities, and it authorizes Tom Green County's own Environmental Health Division to administer OSSF permits and complaints locally. source
Greywater reuse
Unclear - verifyNo standalone Tom Green County greywater ordinance was found; greywater is generally handled under the state's TCEQ OSSF rules (30 TAC 285) through the same County Environmental Health Division. Confirm specifics with that office. source
Rainwater harvesting
Generally allowedNo county ordinance restricting rainwater harvesting was found, so the general state-level allowance applies. Not confirmed whether the county has any extra permit requirement.
Private wells & water rights
Varies locallyPart of Tom Green County lies within the Irion County Water Conservation District, which regulates well registration and groundwater from several aquifers; other parts of the county fall under Texas's default rule of capture with no local groundwater regulator. Well construction standards statewide come from the Texas Department of Licensing and Regulation. source
Living disconnected from utilities
Unclear - verifyNo Tom Green County ordinance was found requiring connection to electric, water, or sewer utilities in unincorporated areas; any such requirement is more likely to come from subdivision deed restrictions or San Angelo's city code if inside city limits.
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
- 1,681 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 24 in/yr
- Heating degree days
- 2,504 (mild)
- Frost-free season
- Mar 26 to Nov 11
How far help isstraight-line
- Hospital
Shannon South Emergency Room - 1.9 mi
- Fire station
San Angelo Fire Station 2 - 1.2 mi
- Hardware store
The Home Depot - 0.5 mi
- Grocery
Walmart Supercenter - 0.9 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 76904).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Tom Green 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.