Waukesha County, WI zoning map, flood zone and property lines by address
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Towns in Waukesha County: Waukesha, New Berlin, Brookfield.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Waukesha County has 205 FIRM panels, the newest effective October 2023; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Waukesha house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Wisconsin statewide parcel layer (from each county, compiled by the State Cartographer), so a Waukesha lot shows the same lines the real property lister draws. Waukesha County covers about 351,826 acres of land and 19,719 acres of water.
Mapped lines are approximate. The Waukesha County real property lister keeps the parcel record (Waukesha County website); a licensed surveyor sets the true corners.
Zoning
In Wisconsin zoning is set by the county, the town or the city or village, depending on where the lot is: in Waukesha County, Waukesha, New Berlin, Brookfield each zone the land inside their limits. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the county, town or city zoning office has the district, the uses it allows and the lot size it needs. The Waukesha County website lists the county's municipalities.
ADU and guest houses
Under Wisconsin's zoning laws (Wis. Stat. 59.69 for counties, 60.61 for towns and 62.23 for cities), the county, the town or the city or village, depending on where the lot is can allow an accessory dwelling unit on a lot with a house. Whether a Waukesha lot can add one depends on its district; the county, town or city zoning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Waukesha County is soil survey area WI133, Waukesha County, Wisconsin, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Waukesha County needs a permit from the Waukesha County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services).
Setbacks
Setbacks in Waukesha County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county, town or city zoning office gives them for the lot's district, and Waukesha, New Berlin, Brookfield for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Waukesha lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Waukesha County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Waukesha County has 205 panels, the newest effective October 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Waukesha County?
Open the Wisconsin map, type the address, and the parcel outline from the Waukesha County real property lister shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Waukesha County?
Zoning in Waukesha County is set by the county, the town or the city or village, depending on where the lot is (such as Waukesha, New Berlin). ParcelSheet shows the use code on the parcel record and names the municipality; the county, town or city zoning office has the final word.
Can I build an ADU in Waukesha County?
Under Wisconsin's zoning laws (Wis. Stat. 59.69 for counties, 60.61 for towns and 62.23 for cities), the county, the town or the city or village, depending on where the lot is can allow an accessory dwelling unit, and each sets its own rules. In Waukesha County ask the county, town or city zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Waukesha County?
Yes. A new or changed septic system in Waukesha County needs a permit from the Waukesha County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area WI133 (Waukesha County, Wisconsin).
What can I build on 5 acres in Waukesha County?
Zoning in Waukesha County is set by the county, the town or the city or village, depending on where the lot is (such as Waukesha, New Berlin). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the county, town or city zoning office has the district and its rules. See the Waukesha County website.
What are the residential setbacks in Waukesha County (2026)?
Setbacks in Waukesha County come from the zoning code of the municipality the lot sits in: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the county, town or city zoning office gives them for the district. See the Waukesha County website.
Next to Waukesha County: Dodge County, Jefferson County, Milwaukee County, Racine County, Washington County.
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