Off-grid site report
Blanco County, TX
30.1007, -98.4221 · 1,375 ft elevationRead this before you act on anything below. This is my researched starting point for Blanco 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 rulesBlanco County, TX
Zoning & raw-land occupancy
Varies locallyBlanco County has no general zoning ordinance for unincorporated land; its authority is limited to subdivision, floodplain, road, and septic rules under Texas Local Government Code Chapters 232-233. Zoning exists only inside the City of Blanco and Johnson City limits/ETJ. source
Dwellings, tiny homes & RVs
Unclear - verifyNo standalone county ordinance on tiny homes, minimum dwelling size, or RV occupancy was confirmed for unincorporated land; county Development Rules mainly address subdivision lot/setback standards. Cities of Blanco and Johnson City have their own separate rules. source
Building permits & codes
Varies locallyNo confirmed countywide building code for unincorporated Blanco County; the City of Blanco requires permits and has adopted the 2015 International Building Codes. Confirm unincorporated-area requirements directly with the county. source
Septic & composting toilets
Generally allowedBlanco County is the local permitting authority for septic (OSSF) systems under state law (Health and Safety Code Ch. 366, Water Code 5.012/5.013) via TCEQ delegation; permits are tied to approved subdivision plats. source
Greywater reuse
Unclear - verifyNo standalone Blanco County greywater ordinance was found; greywater appears to fall under the state OSSF permitting framework administered locally, so confirm specifics with the county's Environmental Health office.
Rainwater harvesting
Generally allowedNo Blanco County ordinance restricting rainwater harvesting was found, and Texas state policy (TWDB) actively encourages it.
Private wells & water rights
RestrictedAll wells in Blanco County must be registered with the Blanco-Pedernales Groundwater Conservation District, which covers the entire county; small domestic wells are generally exempt from an operating permit but must still register and follow spacing rules. source
Living disconnected from utilities
Unclear - verifyNo county or confirmed city ordinance mandates connecting to electric, water, or sewer utilities for occupancy; subdivision plats just disclose utility providers as a platting formality.
Sun30-year normals
- Peak-sun hours, annual average
- 5.5 hrs/day
- Worst month (sizes an off-grid array)
- 4.1 hrs/day
- Yearly output per 1 kW of panels
- 1,539 kWh
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Weather1991-2020
- Precipitation
- 35 in/yr
- Snowfall
- 0 in/yr
- Heating degree days
- 2,190 (mild)
- Frost-free season
- Mar 22 to Nov 13
How far help isstraight-line
- Hospital
Baptist Neighborhood Hospital - Overlook - 29.1 mi
- Fire station
North Hays County Fire Hall 86 - 9.5 mi
- Hardware store
Elder Hardwoods - 17.4 mi
- Grocery
Lowe's Market - 0.8 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 78606).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Blanco 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.