Off-Grid Living in Walla Walla County, Washington

I've been digging through Walla Walla County's official pages and state statute to figure out what's actually realistic if you want to live off-grid here. Quick heads up before anything else: this county has both unincorporated land (governed by county code) and towns like Walla Walla, College Place, Waitsburg, and Prescott, which have their own municipal rules. What follows is about unincorporated county land unless I say otherwise, and I'm not a lawyer, just researching public sources.

Zoning. The county has countywide zoning under its Title 17 code, administered per Washington's Growth Management Act. Whether you can occupy raw land depends entirely on the zone your parcel sits in (agricultural, rural, resource, etc.), and there are critical aquifer recharge overlays layered on top in some areas. You really need to check your parcel's specific zone with the county's Planning & Building department before assuming anything is allowed.

Dwellings, tiny homes, RVs. The City of Walla Walla has language allowing tiny homes in its Neighborhood Residential zone, but that's city code, not county. For unincorporated county land, I could not confirm specific rules on tiny-house-on-wheels or RVs as permanent dwellings. The county does have a manufactured home compliance permit process requiring inspection. If you're planning to live in something unconventional, call Community Development directly and ask before you buy land.

Building permits. Required, administered locally by the county's Building and Planning / Community Development Department, consistent with the state's minimum building code. They also run an online eTRAKiT portal for permit status, inspections, and applications.

Septic and composting toilets. Septic (on-site sewage) is regulated by the county's Department of Community Health under both a county ordinance and the state's WAC 246-272A. As of July 2023, Walla Walla County added a requirement beyond the state baseline: all systems must be designed by a licensed On-Site Sewage System Designer or Professional Engineer before a permit gets approved. Site evaluations require test holes dug several feet deep. There's also a special local rule for the Lewis Peak area requiring wet-season water table monitoring before a permit issues. Composting toilets aren't addressed specifically in county materials I found, so the state WAC baseline likely applies, but confirm with the health department.

Greywater. The county enforces the state's WAC 246-274 greywater rule as adopted; I found no county-specific add-on.

Rainwater harvesting. No county-specific policy found. The state Department of Ecology's general position (no water right needed for on-site non-potable collection) likely applies by default, but this isn't confirmed at the county level.

Wells and water rights. This is the trickiest piece. Walla Walla County sits in a basin where Ecology has flagged limited water availability, and the county participates in a state-created Walla Walla Pilot Local Water Management Program with its own local board. Standard state well-permit exemptions under RCW 90.44.050 still apply, but Ecology's own guidance says to check with the local permitting agency before drilling, since local rules can add requirements.

Full utility disconnection. No standalone county ordinance directly addresses this. In practice, going off-grid here means satisfying building code, septic permitting, and water supply rules separately, since there's no single "off-grid permit."