Off-grid site report

Montgomery County, PA

40.1016, -75.3947 · 184 ft elevation

Read this before you act on anything below. This is my researched starting point for Montgomery 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 rulesMontgomery County, PA

Zoning & raw-land occupancy

Varies locallyMontgomery County has no countywide zoning code; each of the 62 municipalities sets its own zoning under the state Municipalities Planning Code. The County Planning Commission reviews subdivision plans but doesn't zone land itself. source

Dwellings, tiny homes & RVs

Varies locallyNo county-level rule on tiny homes or RV occupancy was found; this is set by each municipality's zoning and property-maintenance code. Confirm with your township or borough.

Building permits & codes

RestrictedThe county doesn't issue building permits; each municipality's building department enforces the statewide Uniform Construction Code. source

Septic & composting toilets

RestrictedThe county's Office of Public Health directly administers septic permitting under the state Sewage Facilities Act (Act 537), including composting toilet rules for washwater disposal. Some townships add their own Sewer Authority review on top. source

Greywater reuse

RestrictedNo county-specific greywater rule was found; it falls under the state baseline (25 Pa. Code §73.65) treating washwater as needing an approved disposal method, not confirmed beyond that.

Rainwater harvesting

Generally allowedThe county Conservation District promotes rain barrels for non-potable uses like gardening; it can't replace an approved potable water supply.

Private wells & water rights

RestrictedUnusually for PA, Montgomery County's Office of Public Health requires a permit for any new drinking water, irrigation, or geothermal well, via a permit-to-construct, inspection, and approval-to-operate process. source

Living disconnected from utilities

Varies locallyNo countywide rule on grid disconnection was found; whether an occupancy permit requires utility hookup is set by each municipality.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.7 hrs/day
Worst month (sizes an off-grid array): 3.0 hrs/day
Yearly output per 1 kW of panels: 1,321 kWh

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Weather1991-2020

Precipitation: 48 in/yr
Snowfall: 24 in/yr
Heating degree days: 5,003 (moderate)
Frost-free season: Apr 11 to Oct 28

How far help isstraight-line

Hospital Wills Eye Hospital: 16.5 mi
Fire station King of Prussia Substation 47-B Fire Station: 0.9 mi
Hardware store Lowe's: 12.0 mi
Grocery Whole Foods Market: 16.6 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 19406).

Size a solar system Heat loss & insulation Firewood per winter Rainwater harvest Garden size Panel tilt

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.