Off-Grid Living in Fayette County, Pennsylvania

I'll be upfront: Fayette County, Pennsylvania is one of those places where the county government doesn't run the whole show. There's no county health department handling septic or wells here, and building code enforcement is split up among all 42 municipalities. So a lot of what governs your off-grid plans depends less on "Fayette County" as a monolith and more on which township or borough your parcel sits in.

Zoning is administered by the Fayette County Planning, Zoning & Community Development office for 31 of the 42 municipalities, per the county's own site. The other 11 handle zoning themselves, though all of them still have to follow the state's Municipalities Planning Code. There's no single zoning map covering the whole county, so the first thing I'd do is confirm which of the two systems applies to your specific parcel.

Dwellings, tiny homes, and RVs as residences aren't addressed in anything I found at the county level. That means you're working off the state's Uniform Construction Code baseline (built on the 2018 IRC) until a township tells you otherwise. Rules on minimum size, RV occupancy, and similar questions would be set township-by-township, so check with the local zoning/UCC officer.

Building permits are required, since Pennsylvania mandated Fayette County adopt the UCC back in 2004, but who actually issues the permit varies. Some townships handle it locally, some contract it out to a third-party agency (Franklin Township, for example, uses K2 Engineering), and others fall under the state's Department of Labor & Industry. There's no single countywide permit counter.

Septic systems are also not a county function here. Fayette County's own planning office tells residents to contact their local municipality to find the appointed Sewage Enforcement Officer. Everything flows from the state's Sewage Facilities Act (Act 537) and the related DEP regulations in Title 25, but enforcement happens locally.

Greywater and rainwater harvesting don't have any Fayette-specific rules that I found. Greywater falls under the same state sewage-permitting framework as septic, meaning it isn't a casual DIY system, it needs a permitted on-lot arrangement. Rainwater harvesting for non-potable uses (irrigation, etc.) appears to be fine under the state baseline, but I found nothing suggesting it can substitute for an approved potable water supply if you're living there full time.

Private wells aren't permitted or inspected by Fayette County; there's no county environmental health office to do it. Well construction runs through state driller-licensing law (Act 610) instead.

Utility disconnection, meaning going without grid power, water, or sewer hookups, isn't addressed by any countywide ordinance I found. Since occupancy and building permitting sit with individual townships, any hookup requirement (if one exists) would come from that municipality, not the county.

Bottom line: Fayette County gives you a partial framework, but the real answers live at the township level for building, septic, and occupancy questions.