Off-Grid Living in Grant County, Washington

I've been digging into what it actually takes to live off-grid in unincorporated Grant County, Washington, and the short version is: it's doable, but every step runs through a permit or review of some kind. There's no "no zoning" loophole here to exploit.

Zoning. Grant County adopted a countywide Unified Development Code (UDC) under the state Growth Management Act, so every parcel falls into a zoning designation, rural, resource, urban growth area, or activity center, and what you can do with land depends on which one you're in. This is administered by Grant County Development Services' Planning Division. There's no county-wide "anything goes" zone, so I'd check your specific parcel before assuming you can put a dwelling or off-grid setup on it.

Dwellings, tiny homes, RVs. The county has a genuinely useful, explicit pathway here. Site-built tiny houses are treated like any other single-family home regardless of size, and units 400 square feet or under can use the relaxed Appendix Q building code provisions. Wheeled units (Park Model RVs, tiny houses on wheels) are a separate track entirely, following the state's RV rules including an L&I insignia and permanent foundation attachment. Where you can actually park or build any of these still comes down to zoning.

Building permits. Grant County Development Services enforces the Washington State Building Code (RCW 19.27) locally, with its own ICC-certified inspectors. Depending on your project, you may also need Health District sign-off (septic, water) and, if your access is off a state highway, a WSDOT approval.

Septic and composting toilets. The Grant County Health District administers the state's on-site septic rules (WAC 246-272A) locally, and it recently updated its own setback standards to match the state and extended installation-start permit validity to two years instead of one. Composting toilets fall under the state DOH registered-products list; I couldn't confirm any additional Grant-specific restriction on top of that, so ask the Health District directly.

Greywater and rainwater. I found no Grant County-specific ordinance for either. Both default to the state baseline (WAC 246-274 for greywater, Ecology's general rainwater harvesting policy), administered locally by the Health District where relevant.

Wells and water rights. Grant County falls under Ecology's Central Regional Office for water rights administration. The state's well-permit exemption applies: wells established before 2020 can draw up to 5,000 gallons/day for domestic and limited irrigation use, while wells after 2020 are capped at 500 gallons/day indoors with much less outdoor watering allowed. Local rules can still add requirements on top, so check with the Health District on well-siting tied to building permits.

Disconnecting from utilities. No county ordinance bans living off-grid outright, but you'll still need to clear building, septic, and water-supply review to get there legally.

Bottom line: Grant County isn't hostile to off-grid living, and it's actually more explicit than most counties about tiny houses, but nothing here is a shortcut around zoning, building, septic, or water permitting.