Off-grid site report
Webb County, TX
27.5174, -99.4500 · 433 ft elevationRead this before you act on anything below. This is my researched starting point for Webb 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 rulesWebb County, TX
Zoning & raw-land occupancy
Unclear - verifyNo countywide zoning ordinance was found; Webb County Planning describes its role as platting and land-use enforcement (especially colonias), not general zoning, consistent with the statewide limit on county zoning power. If your parcel is in Laredo's city limits or ETJ, city zoning applies instead. source
Dwellings, tiny homes & RVs
Unclear - verifyNo county minimum dwelling size, RV, or tiny-home standard was found; the confirmed county-level lever is the Subdivision Regulations governing plats, roads, and infrastructure for new lots. source
Building permits & codes
Unclear - verifyNo Webb County building-code adoption or building-permit ordinance was found on the county's official site; Texas has no statewide building code, so this needs direct confirmation with Webb County Planning. source
Septic & composting toilets
Generally allowedSeptic (OSSF) systems are permitted under Texas Health & Safety Code Ch. 366 and 30 TAC Chapter 285, with Webb County acting as the local permitting authority; a limited exemption exists for a single-family home on 10+ acres meeting site, setback, and no-nuisance conditions. source
Greywater reuse
Unclear - verifyNo standalone Webb County or TCEQ greywater ordinance was found; greywater reuse is generally folded into the state's OSSF framework rather than treated as its own permit category.
Rainwater harvesting
Generally allowedNo Webb County restriction on rainwater harvesting was found; this follows the state baseline that domestic rainwater harvesting is allowed, subject to standard cross-connection/backflow rules if tied to a well or public system.
Private wells & water rights
Varies locallyA new Webb County Groundwater Conservation District, created by the Texas Legislature in 2023 (S.B. 2570), now regulates wells within the boundary of the former Legacy Water Control and Improvement District; outside that boundary, the state's rule-of-capture default still applies. Confirm which side of the line your parcel falls on. source
Living disconnected from utilities
Unclear - verifyNo Webb County ordinance requiring connection to electric, water, or sewer utilities was found in unincorporated areas; such mandates typically come from a municipality, so check with the City of Laredo if you're in its ETJ.
Sun30-year normals
- Peak-sun hours, annual average
- 5.7 hrs/day
- Worst month (sizes an off-grid array)
- 4.6 hrs/day
- Yearly output per 1 kW of panels
- 1,585 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 20 in/yr
- Heating degree days
- 927 (mild)
- Frost-free season
- Feb 3 to Dec 14
How far help isstraight-line
- Hospital
Laredo Medical Center - 2.0 mi
- Fire station
Fire Station #11 - 1.6 mi
- Hardware store
South Central Hardware Inc. - 2.9 mi
- Grocery
Walmart Supercenter - 0.1 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 78040).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Webb 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.