Off-grid site report

Mercer County, PA

41.4093, -80.3795 · 974 ft elevation
Read this before you act on anything below. This is my researched starting point for Mercer County, PA, not legal advice and not a guarantee. Rules change, and the deciding facts on any specific parcel (setbacks, perc results, overlay districts, deed restrictions, road frontage) live at the county or town office, not in any database. Before you buy land or build, confirm the current rules directly with the local zoning and health offices - the sources on this page tell you exactly who to call.

The local rulesMercer County, PA

Zoning & raw-land occupancy
Varies locallyMercer County has no countywide zoning ordinance; 30 of 48 municipalities have adopted their own zoning, so raw-land occupancy rules depend entirely on the specific township or borough. The Mercer County Regional Planning Commission coordinates but does not zone. source
Dwellings, tiny homes & RVs
Unclear - verifyNo Mercer County-specific rule on tiny homes or RVs as permanent dwellings was found; this is set by whichever municipal zoning ordinance applies, or is unregulated in unzoned townships. Confirm with the local Zoning Officer.
Building permits & codes
RestrictedPennsylvania's Uniform Construction Code applies statewide and is administered locally in Mercer County, coordinated in part through the Mercer County Regional Council of Governments, but permits and inspections are issued by individual municipalities or their contracted agencies. source
Septic & composting toilets
RestrictedSeptic permitting under the state's Sewage Facilities Act (Act 537) is carried out in Mercer County by municipal Sewage Enforcement Officers, not a county health department, so rules and process depend on your township. source
Greywater reuse
RestrictedNo Mercer County ordinance on greywater was found; it appears to default to the state Act 537 framework, meaning greywater is treated like sewage and enforced by the local Sewage Enforcement Officer. source
Rainwater harvesting
Generally allowedNo county-specific ordinance was found; Mercer County appears to follow the state baseline allowing rainwater harvesting for non-potable use, with no confirmation it's approved as a sole potable water supply.
Private wells & water rights
Generally allowedPennsylvania does not require a state well permit, and Mercer County's own guidance confirms wells are largely unregulated, though the county Conservation District offers technical assistance on water and soil questions. source
Living disconnected from utilities
Varies locallyNo countywide requirement to connect to utilities was found, and Pennsylvania has no state mandate either, but a certificate of occupancy in a zoned municipality could still require hookups depending on local rules. Confirm with the specific township or borough.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average
4.2 hrs/day
Worst month (sizes an off-grid array)
1.9 hrs/day
Yearly output per 1 kW of panels
1,152 kWh
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Weather1991-2020

Precipitation
41 in/yr
Snowfall
52 in/yr
Heating degree days
6,844 (cold)
Frost-free season
May 15 to Oct 1

How far help isstraight-line

Hospital
UPMC Horizon — Greenville
0.4 mi
Fire station
Greenville Fire Department
0.3 mi
Hardware store
Busy Beaver
1.4 mi
Grocery
Walmart Supercenter
1.1 mi

From OpenStreetMap. Road miles will be longer, often much longer in hill country.

Plan this spot

These open with this location's real numbers already filled in (ZIP 16125).

Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt

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Sources: US Census Bureau geocoder; NLR PVWatts v8 (solar); NOAA NCEI 1991-2020 climate normals (nearest station) or Open-Meteo (ZIP-centroid) for weather; Open-Elevation; OpenStreetMap contributors. Public data retrieved Aug 21, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.