Off-Grid Living in Washington County, Ohio

Washington County, Ohio is a place where the answer to "can I do this?" often depends less on the county and more on which township your land sits in. Here's what I've found digging through the official sources.

Zoning and raw land. Ohio law (ORC 303/519) puts general zoning authority in the hands of townships, not counties. Washington County itself has no countywide zoning code. The county's Planning Commission exists, but its job is subdivision review and right-of-way approval, not land-use rules like minimum dwelling size or whether you can camp or park an RV on raw land. That means whether you can live in a tiny house, RV, or bare-bones cabin on a given parcel comes down to whether that particular township has adopted its own zoning resolution, and many haven't. You have to check with the township trustees or zoning inspector directly; there's no single county page that covers this.

Dwellings, tiny homes, RVs. I couldn't find a Washington County-specific rule here. It inherits the state baseline that HUD-code manufactured homes have to be allowed anywhere single-family homes are, but beyond that, tiny home and RV occupancy rules are set township by township where zoning exists.

Building permits. This part is countywide and clear. The Washington County Building Department, operating as part of the Southeast Ohio Building Department (SEOBD), enforces the Ohio Residential and Building Codes. Before you build most structures you submit construction drawings for approval, and a Certificate of Occupancy comes only after inspections. Small accessory buildings, like sheds 200 square feet or under, are exempt from permitting.

Septic and composting toilets. The Washington County Health Department permits and inspects home sewage treatment systems, following the process (application, then a soil survey with an Environmental Health Specialist) required statewide under Ohio Administrative Code 3701-29. There's also a mandatory Operation & Maintenance program, meaning documented inspections and upkeep aren't optional once a system's installed. Composting toilets aren't separately addressed on the county site, so I'd assume they fall under the same state framework until the Health Department says otherwise.

Greywater and rainwater. Neither has a county-specific page. Both likely fall under the state OAC frameworks (3701-29 for greywater-type systems, 3701-28 for private water systems including rainwater catchment), administered locally by the Health Department, but I can't confirm county-level specifics.

Wells. Regulated the same way, through the Washington County Health Department's Environmental Health division, under state ORC 3701.344-347 and OAC 3701-28. You need a permit before constructing, altering, or sealing a private water system.

Utilities. No county ordinance requiring hookup to grid power, water, or sewer was found. But any permitted structure still has to meet Residential Code occupancy standards for its Certificate of Occupancy, and townships with zoning may layer on their own habitability rules.

Bottom line: building, septic, and wells are handled consistently at the county/state level, but zoning and dwelling rules are a township patchwork. Always confirm with the specific township before assuming anything.