Off-Grid Living in Kittitas County, Washington

I've been digging into what off-grid living actually looks like in Kittitas County, Washington, and the short version is: this is not a wide-open "unzoned rural county" situation. Kittitas County has a full countywide zoning code, and on top of that it sits in one of the most heavily litigated groundwater basins in the state (the Yakima River Basin). That combination makes it a trickier place to go off-grid than a lot of the counties I've covered.

Zoning is set by the county under Title 17 of the Kittitas County Code, with zones ranging from Rural-5 and Agriculture-5 (5-acre minimums) up to Forest & Range zones with much larger minimums. New rural density, including subdivisions, is explicitly tied to whether "adequate supplies of potable water are available," so land use and water rules are intertwined here from the start. If you're eyeing property inside Ellensburg, Cle Elum, Roslyn, South Cle Elum, or Kittitas (the town), remember those cities administer their own separate codes, not the county's.

Dwellings, tiny homes, and RVs are tightly regulated under the county's building code (Title 14). RVs generally can't be used as a permanent residence, there's a strict cap on how long an RV can be occupied before it must be disconnected from utilities, and park model trailers require county-inspected foundations with no alterations allowed. I found no county carve-out for "tiny houses on wheels," so they'd fall under the same RV rules by default. Confirm specifics with the Building Division before you buy a trailer or tiny house.

Building permits run through the county, and here's the catch for off-gridders: you can't get a certificate of occupancy until the Kittitas County Public Health Department signs off on your potable water and sewage disposal. No well/septic approval, no legal occupancy.

Septic is administered locally by Kittitas County Public Health under the state's WAC 246-272A rule. You'll need a site evaluation from an Environmental Health Specialist before an installation permit, but the county does allow homeowner self-installation (commercial installers need a county license). Composting toilets aren't specifically addressed in anything I found at the county level, so I'd call the Liquid Waste program directly.

Greywater and rainwater harvesting have no confirmed county-specific ordinances. The state baselines (WAC 246-274 for greywater, Department of Ecology policy for rainwater) would presumably apply through the county health department, but I couldn't confirm distinct local rules either way, so treat this as unclear.

Wells and water rights are the biggest wrinkle in Kittitas County. Because of Yakima Basin water scarcity, new groundwater uses generally require Water Budget Neutral mitigation and metering, and most building permits need an Adequate Water Supply Determination. This is a real, county-specific hurdle beyond the standard state exempt-well statute, so don't assume you can just drill a well and build.

Bottom line on "living disconnected": there's no ordinance that outright bans off-grid living, but the RV occupancy rules and the water/septic sign-off requirement for occupancy certificates functionally block a fully disconnected permanent dwelling unless you document compliance.