Off-grid site report
Presidio County, TX
29.5636, -104.3716 · 2,585 ft elevationRead this before you act on anything below. This is my researched starting point for Presidio 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 rulesPresidio County, TX
Zoning & raw-land occupancy
Unclear - verifyPresidio County has no general zoning authority over unincorporated land, as is typical for Texas counties; only Marfa and Presidio (incorporated cities) can zone. No county zoning or planning department page was found.
Dwellings, tiny homes & RVs
Unclear - verifyNo Presidio County ordinance on tiny homes, minimum dwelling size, or RV living was found. Texas counties have only limited optional authority here, and no evidence shows Presidio County has adopted such rules.
Building permits & codes
Unclear - verifyNo building-permit or code-enforcement page exists on the county's official site. Texas has no statewide building code and counties opt in voluntarily; whether Presidio County has done so for unincorporated areas is not confirmed. source
Septic & composting toilets
Generally allowedSeptic (OSSF) systems are regulated statewide by TCEQ under Health and Safety Code Chapter 366 and 30 TAC Chapter 285. Whether Presidio County has its own authorized agent or defers to the TCEQ regional office is not confirmed. source
Greywater reuse
Unclear - verifyNo separate county or state greywater ordinance was found; greywater appears to fall under the general OSSF/30 TAC 285 framework without a distinct local rule.
Rainwater harvesting
Generally allowedNo restrictions were found, and the Presidio County Underground Water Conservation District actively promotes rainwater catchment as part of its strategic water plan.
Private wells & water rights
Varies locallyThe Presidio County Underground Water Conservation District requires Operating Permits for non-exempt wells, but ordinary household wells are typically exempt. A 2025 state bill (SB 3044) changed the district's structure, so current rules should be reverified. source
Living disconnected from utilities
Unclear - verifyNo county ordinance requiring utility hookups for unincorporated land was found; such rules, if they exist, would most likely apply only within Marfa or Presidio city limits.
Sun30-year normals
- Peak-sun hours, annual average
- 6.7 hrs/day
- Worst month (sizes an off-grid array)
- 5.7 hrs/day
- Yearly output per 1 kW of panels
- 1,830 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 10 in/yr
- Snowfall
- 0 in/yr
- Heating degree days
- 1,388 (mild)
- Frost-free season
- Feb 27 to Nov 28
How far help isstraight-line
- Hospital
Instituto Mexicano del Seguro Social - 1.7 mi
- Fire station
Presidio Fire Station - 0.9 mi
- Hardware store
Ferreteria Norte - 3.8 mi
- Grocery
Porter's - 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 79845).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Presidio 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.