Monroe County, WI zoning map, flood zone and property lines by address
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Towns in Monroe County: Sparta, Tomah, Cashton.
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 Monroe County has 160 FIRM panels, the newest effective December 2019; 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 Monroe 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 Monroe lot shows the same lines the real property lister draws. Monroe County covers about 576,579 acres of land and 4,593 acres of water.
Mapped lines are approximate. The Monroe County real property lister keeps the parcel record (Monroe 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 Monroe County, Sparta, Tomah, Cashton 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 Monroe 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 Monroe 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. Monroe County is soil survey area WI081, Monroe County, Wisconsin, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Monroe County needs a permit from the Monroe County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services).
Setbacks
Setbacks in Monroe 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 Sparta, Tomah, Cashton for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Monroe lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Monroe 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 Monroe County has 160 panels, the newest effective December 2019. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Monroe County?
Open the Wisconsin map, type the address, and the parcel outline from the Monroe 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 Monroe County?
Zoning in Monroe County is set by the county, the town or the city or village, depending on where the lot is (such as Sparta, Tomah). 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 Monroe 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 Monroe 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 Monroe County?
Yes. A new or changed septic system in Monroe County needs a permit from the Monroe 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 WI081 (Monroe County, Wisconsin).
What can I build on 5 acres in Monroe County?
Zoning in Monroe County is set by the county, the town or the city or village, depending on where the lot is (such as Sparta, Tomah). 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 Monroe County website.
What are the residential setbacks in Monroe County (2026)?
Setbacks in Monroe 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 Monroe County website.
Next to Monroe County: Jackson County, Juneau County, La Crosse County, Vernon County.
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