Milwaukee County, WI zoning map, flood zone and property lines by address
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Towns in Milwaukee County: Milwaukee, West Allis, Wauwatosa.
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 Milwaukee County has 111 FIRM panels, the newest effective October 2024; coastal V zones, where waves add to the flood, are mapped along its shore.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Milwaukee 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 Milwaukee lot shows the same lines the real property lister draws. Milwaukee County covers about 154,533 acres of land and 606,755 acres of water.
Mapped lines are approximate. The Milwaukee County real property lister keeps the parcel record (Milwaukee 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 Milwaukee County, Milwaukee, West Allis, Wauwatosa 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 Milwaukee 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 Milwaukee 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. Milwaukee County is soil survey area WI079, Milwaukee County, Wisconsin, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Milwaukee County needs a permit from the Milwaukee County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services).
Setbacks
Setbacks in Milwaukee 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 Milwaukee, West Allis, Wauwatosa for land inside their limits.
Hazards that apply
- Storm surge. Milwaukee County has coastal V zones on its FEMA map, so storm surge reaches its shore. The county's evacuation zones are on its emergency management site; ParcelSheet shows the FEMA zone and the 3 ft sea level rise map at the lot.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Milwaukee lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Milwaukee 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 Milwaukee County has 111 panels, the newest effective October 2024. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Milwaukee County?
Open the Wisconsin map, type the address, and the parcel outline from the Milwaukee 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 Milwaukee County?
Zoning in Milwaukee County is set by the county, the town or the city or village, depending on where the lot is (such as Milwaukee, West Allis). 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 Milwaukee 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 Milwaukee 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 Milwaukee County?
Yes. A new or changed septic system in Milwaukee County needs a permit from the Milwaukee 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 WI079 (Milwaukee County, Wisconsin).
What can I build on 5 acres in Milwaukee County?
Zoning in Milwaukee County is set by the county, the town or the city or village, depending on where the lot is (such as Milwaukee, West Allis). 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 Milwaukee County website.
What are the residential setbacks in Milwaukee County (2026)?
Setbacks in Milwaukee 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 Milwaukee County website.
Next to Milwaukee County: Ozaukee County, Racine County, Waukesha County.
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