Off-grid site report
Orange County, CA
33.8413, -117.9949 · 89 ft elevationRead this before you act on anything below. This is my researched starting point for Orange County, CA, 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 rulesOrange County, CA
Zoning & raw-land occupancy
RestrictedOC's Comprehensive Zoning Code governs unincorporated areas and has no general allowance for occupying raw/vacant land off-grid; any residence must fit a permitted dwelling classification for its zoning district. Incorporated cities use their own zoning codes instead. source
Dwellings, tiny homes & RVs
RestrictedManufactured/mobile homes are a distinct, permit-governed dwelling category under the County Zoning Code, but permanent occupancy of a standalone RV outside a mobile-home park isn't listed as a standard permitted dwelling use in the sections reviewed. source
Building permits & codes
RestrictedOC Development Services requires standard building permits for unincorporated areas with no off-grid exemption; even ground-mounted solar or solar water heaters can trigger permits, and state Title 24 energy code applies on top. source
Septic & composting toilets
RestrictedSeptic systems follow the State Water Board's OWTS Policy, with Orange County's Local Agency Management Program (LAMP) administered locally and the Santa Ana Regional Water Quality Control Board as lead agency; OC Public Works requires Regional Board clearance before reviewing septic plans. Composting toilet rules not confirmed. source
Greywater reuse
Generally allowedNo Orange County-specific greywater ordinance stricter than the state's California Plumbing Code Chapter 15 was found; this is not confirmed to differ from the state baseline.
Rainwater harvesting
Generally allowedNo county-specific restriction on rooftop rainwater capture was found; treated as inheriting the state Rainwater Capture Act (AB 1750) baseline.
Private wells & water rights
RestrictedThe Orange County Health Care Agency enforces the County Well Ordinance requiring a permit to construct, reconstruct, or destroy wells in unincorporated areas and in 29 of 34 cities; five cities (Anaheim, Buena Park, Fountain Valley, Orange, San Clemente) enforce their own well rules.
Living disconnected from utilities
Unclear - verifyNo dedicated County ordinance addresses off-grid utility disconnection directly, but the combined building, septic, and well permitting chain makes full disconnection difficult for a legally permitted residence; not confirmed as explicitly banned or protected.
Sun30-year normals
- Peak-sun hours, annual average
- 6.1 hrs/day
- Worst month (sizes an off-grid array)
- 4.7 hrs/day
- Yearly output per 1 kW of panels
- 1,693 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 14 in/yr
- Heating degree days
- 1,225 (mild)
How far help isstraight-line
- Hospital
Los Angeles Community Hospital - 16.5 mi
- Fire station
OCFA Station 13 - 2.4 mi
- Hardware store
Vista Paint - 5.9 mi
- Grocery
Stater Bros. - 2.4 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 90622).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Orange County, CA?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.