Off-Grid Living in Grays Harbor County, Washington

If you're eyeing off-grid land in Grays Harbor County, Washington, here's what I've found digging through the county's own pages. As always, remember: this is unincorporated county land I'm describing. If your parcel is inside Aberdeen, Montesano, Ocean Shores, Hoquiam, or another incorporated town, throw this out and check that town's own zoning and building code instead, they run separately from the county.

Zoning. Grays Harbor County has countywide zoning for the unincorporated areas, laid out under Title 17 of the county code, administered by the Planning Division. There's a mix of districts, Restricted Residential, General Residential, Resort Residential, Rural Residential, and General Development districts meant for a wider range of rural uses. Whether you can legally live in an RV, tent, or camp on raw land comes down entirely to which district your specific parcel sits in, and some uses need Conditional Use approval from the Board of Adjustment. There's no single county-wide yes or no here, you have to check your parcel.

Dwellings, tiny homes, RVs. The county follows the state building code for permanent, foundation-built homes. For accessory structures, the county sets clear caps: an exempt structure up to 800 square feet can't be lived in, and a smaller 200-square-foot exempt structure also can't be occupied as a dwelling. I could not confirm a dedicated county ordinance addressing RVs as permanent residences, so if that's your plan, call the Building Division directly before you commit.

Building permits. Most construction needs a county permit, issued through the Building Division. The county has moved application intake to its SmartGov online portal, and paper applications aren't accepted anymore except for construction drawings. Small detached accessory buildings, sheds and similar under 200 square feet meeting setback rules, are exempt from permitting.

Septic and composting toilets. The county's Environmental Health Division, On-Site Sewage Section, permits all septic systems, and design work must come from a Washington State licensed On-Site Designer or Professional Engineer. Applications go through SmartGov now too. Good news for resale: Grays Harbor County does not require septic inspection at point of sale, unlike some other counties. Composting toilet rules specifically aren't confirmed at the county level; I'd assume the state WAC baseline applies and would ask Environmental Health to be sure.

Greywater and rainwater. I found no county-specific ordinance for either. These likely default to the state Department of Ecology and state health code (WAC 246-274) baselines, administered locally, but there's no dedicated county page laying out rules, so confirm directly with Environmental Health if you're planning a greywater system.

Wells. Group B water systems (3 to 14 connections) require a site inspection and Environmental Health Division approval before drilling. Subdivisions face a water-availability evaluation through the same office. A single private domestic well otherwise follows the state's exempt-well framework under RCW 90.44.050.

Full utility disconnection. No standalone county rule addresses this directly. In practice, going off-grid successfully means separately satisfying Planning (zoning), Building (permits), and Environmental Health (septic/water) for your particular parcel.