Off-grid site report
San Jacinto County, TX
30.5857, -95.1266 · 381 ft elevationRead this before you act on anything below. This is my researched starting point for San Jacinto 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 rulesSan Jacinto County, TX
Zoning & raw-land occupancy
Varies locallySan Jacinto County has no countywide zoning ordinance, but the Commissioners Court enforces broad subdivision rules affecting land division. If your parcel is in an incorporated town, that town's own zoning would apply instead. source
Dwellings, tiny homes & RVs
Unclear - verifyNo dedicated county ordinance on minimum dwelling size or RV occupancy was found; the Texas state baseline (no statewide minimum size, narrow county building authority since 2009) applies. Confirm current practice with the county permit office.
Building permits & codes
Generally allowedThe county requires a General Residential Development Permit issued via the Central Appraisal office, with floodplain review triggered if the 9-1-1 address falls within a FEMA flood zone. This is a permit process rather than a full adopted building code. source
Septic & composting toilets
Varies locallyStandard state OSSF rules under 30 TAC Chapter 285 apply countywide via the county's authorized agent, but properties within 2,075 feet of Lake Conroe are instead regulated and permitted by the San Jacinto River Authority. source
Greywater reuse
Unclear - verifyNo standalone county or SJRA greywater ordinance was found; greywater is governed within the state's OSSF/30 TAC 285 framework with no county-specific addition located. Ask the county's OSSF authorized agent for confirmation.
Rainwater harvesting
Generally allowedNo county ordinance restricting rainwater harvesting for domestic use was found; the state's generally permissive posture toward rainwater collection applies.
Private wells & water rights
Varies locallySan Jacinto County is covered by the Lower Trinity Groundwater Conservation District, so well owners fall under district registration and spacing rules rather than pure rule-of-capture; every driller must also file a State Well Report with TDLR. source
Living disconnected from utilities
Unclear - verifyNo county ordinance was found mandating connection to electric, water, or sewer utilities; such mandates, if any, would come from an incorporated town's code rather than the county.
Sun30-year normals
- Peak-sun hours, annual average
- 5.1 hrs/day
- Worst month (sizes an off-grid array)
- 4.0 hrs/day
- Yearly output per 1 kW of panels
- 1,355 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 51 in/yr
- Heating degree days
- 1,864 (mild)
- Frost-free season
- Mar 8 to Nov 27
How far help isstraight-line
- Hospital
CHI Sainit Luke's Health-Memorial Livingston - 15.0 mi
- Fire station
Bear Creek Volunteer Fire Department - 11.1 mi
- Hardware store
Lowe's - 13.4 mi
- Grocery
Brookshire Brothers - 0.6 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 77331).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in San Jacinto 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.