Off-Grid Living in Chelan County, Washington

I've been digging into what off-grid living actually looks like in Chelan County, Washington, and the short version is: nothing here is unregulated, but nothing is flatly banned either. You're working within a stack of state, county, and health-district rules, and where they intersect matters a lot.

Zoning is countywide. Chelan County Community Development administers zoning under the county's Comprehensive Plan, and rural parcels typically fall into designations like Rural Residential/Resource (RR-20 is one example I saw referenced). What you can put on a given parcel depends on its specific zone, so don't assume raw land equals a blank slate, call Community Development and ask about your parcel's zone before you plan anything.

Dwellings: Washington State's Residential Code (Appendix Q) allows tiny houses built on-site as permanent dwellings, and tiny houses built off-site on wheels need Washington L&I approval. Park Model RVs certified to ANSI A119.5 can work as permanent dwellings too, if they carry a WA State Insignia, sit on a permanent foundation, and have approved utilities, plus the county's own placement permit (valid six months, renewable once). Manufactured homes need a county placement permit as well, and pre-1976 units need an L&I alteration permit first. Yurts on permanent foundations are allowed too.

Building permits run through the county Building Division under the standard suite of state codes (IBC, IRC, plumbing, mechanical, energy code) plus FEMA floodplain rules. Before you get a Certificate of Occupancy, the county wants a Letter of Availability from a water supplier or sewer district, plus final septic sign-off from the Chelan-Douglas Health District.

Septic is handled by the Chelan-Douglas Health District, which reviews and inspects all on-site systems. Composting toilets fall under the statewide Department of Health standard; I didn't find a county-specific composting-toilet rule, so confirm details with the Health District directly.

Greywater and rainwater harvesting: I could not confirm county-specific ordinances on either. Greywater likely falls under the statewide WAC framework, and rainwater catchment doesn't appear separately addressed in county materials I reviewed, so ask Community Development or the Health District before you build a system and assume it's fine.

Wells and water rights are where Chelan County adds real teeth. Beyond the state's standard permit-exempt well rules, the county runs a Water Mitigation Program requiring a Water Mitigation Certificate for new dwellings in the Entiat, Lake Chelan, and Wenatchee basins, unless you're replacing an existing dwelling on the same parcel or hooking to an approved public water system. Septic permits also require a Private Water Review proving adequate supply.

Utility disconnection isn't banned outright, but it's practically gated: you need that Letter of Availability and final septic approval before occupancy, so a fully off-grid water/waste setup has to clear those reviews rather than being automatically prohibited.

Bottom line: Chelan County is workable for off-grid living, but plan around water rights and septic review early, since those two gates control almost everything else.