Off-grid site report
Waukesha County, WI
42.9036, -88.2523 · 889 ft elevationRead this before you act on anything below. This is my researched starting point for Waukesha County, WI, 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 rulesWaukesha County, WI
Zoning & raw-land occupancy
Varies locallyWaukesha County zoning applies only to the Township of Ottawa, the Village of Lac La Belle, and shoreland/floodland areas in six other towns; everywhere else, the town, village, or city sets its own zoning rules. source
Dwellings, tiny homes & RVs
Varies locallyLocal building inspectors enforce the state Uniform Dwelling Code; no county-specific tiny-home or RV-living ordinance was confirmed, so check the specific town or village. source
Building permits & codes
Varies locallyThe county reviews zoning permits and forwards approvals to the local building inspector, who is the actual building department for most addresses in the county. source
Septic & composting toilets
RestrictedWaukesha County Environmental Health issues sanitary permits under state statute and county code; composting toilets need compliant liquid disposal per state code SPS 391.10, and holding tanks may need a county committee appeal for long-term use. source
Greywater reuse
Unclear - verifyNo county-specific greywater ordinance was found; greywater reuse would fall under the state plumbing code (DSPS, SPS 383) baseline, so confirm with the state or county Environmental Health.
Rainwater harvesting
Unclear - verifyNo Waukesha County ordinance or guidance on rainwater harvesting was found; outdoor non-potable use is generally accepted under the state baseline, while indoor/potable use faces the stricter state plumbing code.
Private wells & water rights
Generally allowedPrivate wells are permitted and administered under the state DNR well code (NR 812); homeowners are responsible for their own water testing, and well abandonment must be done by a licensed professional per state rule. source
Living disconnected from utilities
Unclear - verifyNo county or state rule was found that directly addresses fully disconnecting a legal dwelling from utilities; this likely intersects with local building-code occupancy standards enforced by your town's building inspector.
Sun30-year normals
- Peak-sun hours, annual average
- 4.6 hrs/day
- Worst month (sizes an off-grid array)
- 2.9 hrs/day
- Yearly output per 1 kW of panels
- 1,339 kWh
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Weather1991-2020
- Precipitation
- 35 in/yr
- Snowfall
- 40 in/yr
- Heating degree days
- 7,362 (cold)
- Frost-free season
- May 1 to Oct 6
How far help isstraight-line
- Hospital
Watertown Regional Medical Center - 30.4 mi
- Fire station
Vernon Fire Department - 1.8 mi
- Hardware store
Anchors A'Weigh - 5.2 mi
- Grocery
ALDI - 5.0 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 53103).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Waukesha County, WI?The rules above are the jurisdiction. The land check runs the parcel itself: flood zone, soils and septic suitability, wetlands, slope, access, climate, and these verdicts, from a parcel number or coordinates.
Check a parcel →Share or save this report:New report
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 22, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.
New here, or not sure where this fits? Start here walks through the whole thing in order.