Washington County, WI zoning map, flood zone and property lines by address
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Towns in Washington County: West Bend, Germantown, Hartford.
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 Washington County has 181 FIRM panels, the newest effective February 2026; 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 Washington 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 Washington lot shows the same lines the real property lister draws. Washington County covers about 275,612 acres of land and 3,212 acres of water.
Mapped lines are approximate. The Washington County real property lister keeps the parcel record (Washington 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 Washington County, West Bend, Germantown, Hartford 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 Washington 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 Washington 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. Washington County is soil survey area WI131, Washington County, Wisconsin, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Washington County needs a permit from the Washington County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services).
Setbacks
Setbacks in Washington 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 West Bend, Germantown, Hartford for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Washington lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Washington 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 Washington County has 181 panels, the newest effective February 2026. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Washington County?
Open the Wisconsin map, type the address, and the parcel outline from the Washington 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 Washington County?
Zoning in Washington County is set by the county, the town or the city or village, depending on where the lot is (such as West Bend, Germantown). 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 Washington 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 Washington 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 Washington County?
Yes. A new or changed septic system in Washington County needs a permit from the Washington 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 WI131 (Washington County, Wisconsin).
What can I build on 5 acres in Washington County?
Zoning in Washington County is set by the county, the town or the city or village, depending on where the lot is (such as West Bend, Germantown). 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 Washington County website.
What are the residential setbacks in Washington County (2026)?
Setbacks in Washington 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 Washington County website.
Next to Washington County: Dodge County, Fond du Lac County, Ozaukee County, Sheboygan County, Waukesha County.
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