Trempealeau County, WI zoning map, flood zone and property lines by address
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Towns in Trempealeau County: Arcadia, Osseo, Trempealeau.
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 Trempealeau County has 88 FIRM panels, the newest effective April 2011; 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 Trempealeau 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 Trempealeau lot shows the same lines the real property lister draws. Trempealeau County covers about 469,098 acres of land and 5,765 acres of water.
Mapped lines are approximate. The Trempealeau County real property lister keeps the parcel record (Trempealeau 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 Trempealeau County, Arcadia, Osseo, Trempealeau 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 Trempealeau 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 Trempealeau 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. Trempealeau County is soil survey area WI121, Trempealeau County, Wisconsin, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Trempealeau County needs a permit from the Trempealeau County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services).
Setbacks
Setbacks in Trempealeau 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 Arcadia, Osseo, Trempealeau for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Trempealeau lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Trempealeau 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 Trempealeau County has 88 panels, the newest effective April 2011. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Trempealeau County?
Open the Wisconsin map, type the address, and the parcel outline from the Trempealeau 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 Trempealeau County?
Zoning in Trempealeau County is set by the county, the town or the city or village, depending on where the lot is (such as Arcadia, Osseo). 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 Trempealeau 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 Trempealeau 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 Trempealeau County?
Yes. A new or changed septic system in Trempealeau County needs a permit from the Trempealeau 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 WI121 (Trempealeau County, Wisconsin).
What can I build on 5 acres in Trempealeau County?
Zoning in Trempealeau County is set by the county, the town or the city or village, depending on where the lot is (such as Arcadia, Osseo). 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 Trempealeau County website.
What are the residential setbacks in Trempealeau County (2026)?
Setbacks in Trempealeau 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 Trempealeau County website.
Next to Trempealeau County: Buffalo County, Eau Claire County, Jackson County, La Crosse County.
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