Off-grid site report
Jeff Davis County, TX
30.5875, -103.8947 · 4,885 ft elevationRead this before you act on anything below. This is my researched starting point for Jeff Davis 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 rulesJeff Davis County, TX
Zoning & raw-land occupancy
Unclear - verifyNo countywide zoning ordinance is published on the county's official site, and Texas counties generally lack broad zoning power over unincorporated land; state platting rules under the Local Government Code still apply.
Dwellings, tiny homes & RVs
Unclear - verifyNo Jeff Davis County ordinance on dwelling size, tiny homes, or RV occupancy was found; the county would need to have opted into limited state authority (post-2009) to regulate this, and no adoption record was found. source
Building permits & codes
Unclear - verifyThe county's official site does not show a building-permit office, adopted code, or inspection department for unincorporated areas; not confirmed whether any county program exists, so check directly with the County Judge's office. source
Septic & composting toilets
RestrictedSeptic systems (OSSFs) require a permit under Texas state rules; TCEQ is the default permitting authority anywhere a county hasn't been separately authorized, and no local Jeff Davis County OSSF program was confirmed. source
Greywater reuse
Unclear - verifyNo standalone county or state greywater rule exists apart from the general state OSSF framework covering all on-site sewage disposal, including greywater components. source
Rainwater harvesting
Generally allowedNo Jeff Davis County ordinance restricts rainwater harvesting; the state baseline, including TWDB encouragement and TCEQ backflow rules for potable connections, applies. source
Private wells & water rights
RestrictedAll of Jeff Davis County lies within the Jeff Davis County Underground Water Conservation District, a state-created local body that sets well permitting and pumping rules rather than leaving groundwater unrestricted. source
Living disconnected from utilities
Unclear - verifyNo Jeff Davis County ordinance requiring connection to electric, water, or sewer utilities was found on the official county site; any such requirement is not confirmed at the county level.
Sun30-year normals
- Peak-sun hours, annual average
- 6.4 hrs/day
- Worst month (sizes an off-grid array)
- 5.8 hrs/day
- Yearly output per 1 kW of panels
- 1,804 kWh
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Weather1991-2020
- Precipitation
- 17 in/yr
- Snowfall
- 2 in/yr
- Heating degree days
- 2,888 (mild)
- Frost-free season
- Apr 8 to Oct 30
How far help isstraight-line
- Hospital
Big Bend Regional Medical Center - 19.4 mi
- Fire station
Jeff Davis County Emergency Services - 0.1 mi
- Hardware store
Marfa Hardware - 20.5 mi
- Grocery
Stone Village Market - 0.4 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 79734).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Jeff Davis 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 22, 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.