Off-grid site report
Atascosa County, TX
28.9193, -98.5459 · 479 ft elevationRead this before you act on anything below. This is my researched starting point for Atascosa 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 rulesAtascosa County, TX
Zoning & raw-land occupancy
Generally allowedAtascosa County has no countywide zoning ordinance, consistent with the general lack of Texas county zoning power. Incorporated towns within the county set their own zoning if your parcel is inside city limits. source
Dwellings, tiny homes & RVs
Generally allowedThe county Fire Marshal's office states single-family dwelling permits are optional, not required, in unincorporated Atascosa County. RV use as a permanent dwelling isn't specifically addressed, so confirm with the Fire Marshal's office.
Building permits & codes
Varies locallyThe county has adopted the 2024 International Fire Code and Building Code, required for commercial and multi-family buildings of four units or more, but single-family homes don't need a county building permit. source
Septic & composting toilets
RestrictedAtascosa County's Environmental Health Department is the TCEQ-designated authority permitting all OSSFs, requiring a licensed designer, an assigned address, and additional paperwork for aerobic systems. source
Greywater reuse
Unclear - verifyNo standalone county greywater ordinance was found; it's likely folded into the OSSF/TCEQ framework the county administers. Confirm specifics with the Environmental Health Department.
Rainwater harvesting
Generally allowedNo Atascosa County rule restricting rainwater harvesting was found, and Texas generally supports it for domestic use. Not confirmed whether any local plumbing conditions apply.
Private wells & water rights
RestrictedPrivate wells fall under the Evergreen Underground Water Conservation District, which can deny permits or limit withdrawals under its own rules, overriding the state's default rule of capture. source
Living disconnected from utilities
Generally allowedNo county mandate requires unincorporated households to connect to electric or water utilities; proof of availability is only required when platting a new subdivision.
Sun30-year normals
- Peak-sun hours, annual average
- 5.4 hrs/day
- Worst month (sizes an off-grid array)
- 4.4 hrs/day
- Yearly output per 1 kW of panels
- 1,496 kWh
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Weather1991-2020
- Precipitation
- 32 in/yr
- Snowfall
- 0 in/yr
- Heating degree days
- 1,465 (mild)
- Frost-free season
- Feb 27 to Nov 29
How far help isstraight-line
- Hospital
Methodist Hospital South - 1.5 mi
- Fire station
Poteet Volunteer Fire Department - 8.3 mi
- Hardware store
MG Lumber - 3.0 mi
- Grocery
Walmart Supercenter - 2.4 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 78026).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Atascosa 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.