Off-Grid Living in Allegheny County, Pennsylvania

I'll be upfront: Allegheny County is a tricky place to research off-grid rules because Pennsylvania is "fully municipalized." There's no unincorporated land here, and the county itself has no countywide zoning code. That means for a lot of these questions, my honest answer is "it depends on which of the 130 municipalities you're in" - and I'd rather tell you that clearly than pretend there's one county-wide answer.

Zoning and raw land. Zoning is enacted separately by each borough, township, or city. Allegheny County Economic Development (ACED) is the county's planning agency, and it acts as the default subdivision/land-development authority for the 27 municipalities that haven't adopted their own subdivision ordinance. But actual use districts, minimum lot sizes, and whether you can just live on raw land are decided municipality by municipality. You have to check with your specific town.

Dwellings, tiny homes, RVs. Same story. Pennsylvania sets a statewide building baseline (the Uniform Construction Code), but whether a tiny home on wheels or an RV can be a permanent residence is a municipal zoning call, not a county one. I couldn't confirm a single county-wide answer.

Building permits. Pennsylvania's Uniform Construction Code, administered by the state Department of Labor & Industry, is the baseline everywhere. Most of Pennsylvania's municipalities enforce it themselves or through a certified third-party agency; Pittsburgh runs its own permitting through PLI. You'll need to find your specific municipality's building office.

Septic and composting toilets. This is one area where the county does step in directly. The Allegheny County Health Department (ACHD) enforces Article XIV of its own Rules and Regulations, covering septic systems, non-sewered toilets (including composting units), sewage haulers, and system abandonment. Non-sewered systems need a permit under Article XIV, they're not simply unregulated. I could not confirm ACHD's stance on holding tanks for year-round use, so ask them directly.

Greywater. No distinct county greywater ordinance turned up in my research. ACHD's Article XIV treats wastewater broadly as sewage, consistent with Pennsylvania's general approach.

Rainwater harvesting. I found no Allegheny County-specific rule here at all. It likely falls back to the state baseline, where collecting rainwater for non-potable use is fine, but using it as your only water source for a permanent residence is not the approved path.

Wells. ACHD is more active here than in many PA counties: it offers well-water bacteria testing and enforces plumbing code covering private water and drainage systems. State well-driller licensing still applies on top of that.

Off-grid utilities. No county ordinance requires hookup to grid power, water, or sewer. That's a municipal call, tied to building and occupancy permit conditions in your specific town.

Bottom line: start with your municipality's zoning/building office, then loop in ACHD for anything involving septic, wells, or wastewater.