Winona County, MN zoning map, flood zone and property lines by address
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Towns in Winona County: Winona, Goodview, Saint Charles.
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 has 55 FIRM panels covering Winona County, the newest effective July 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 Winona 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 Minnesota open parcel layer (Minnesota Geospatial Information Office, from the counties that share their parcels), so a Winona lot shows the same lines the county assessor draws. Winona County covers about 400,762 acres of land and 9,888 acres of water.
Mapped lines are approximate. The Winona County assessor keeps the parcel record (Winona County website); a licensed surveyor sets the true corners.
Zoning
In Minnesota zoning is set by the county, the township or the city, depending on where the lot is: in Winona County, Winona, Goodview 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, township or city zoning office has the district, the uses it allows and the lot size it needs. The Winona County website lists the county's municipalities.
ADU and guest houses
Under Minnesota's zoning laws (Minnesota Statutes chapters 394 and 462), the county, the township or the city, depending on where the lot is can allow an accessory dwelling unit on a lot with a house. Whether a Winona lot can add one depends on its district; the county, township 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. Winona County is soil survey area MN169, Winona County, Minnesota, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Winona County needs a permit from the Winona County septic (SSTS) program under the Minnesota Pollution Control Agency rules.
Setbacks
Setbacks in Winona County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county, township or city zoning office gives them for the lot's district, and Winona and Goodview for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Winona lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Winona County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 55 flood map panels covering Winona County, the newest effective July 2026. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Winona County?
Open the Minnesota map, type the address, and the parcel outline from the Winona County assessor 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 Winona County?
Zoning in Winona County is set by the county, the township or the city, depending on where the lot is (such as Winona, Goodview). ParcelSheet shows the use code on the parcel record and names the municipality; the county, township or city zoning office has the final word.
Can I build an ADU in Winona County?
Under Minnesota's zoning laws (Minnesota Statutes chapters 394 and 462), the county, the township or the city, depending on where the lot is can allow an accessory dwelling unit, and each sets its own rules. In Winona County ask the county, township 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 Winona County?
Yes. A new or changed septic system in Winona County needs a permit from the Winona County septic (SSTS) program under the Minnesota Pollution Control Agency rules. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area MN169 (Winona County, Minnesota).
What can I build on 5 acres in Winona County?
Zoning in Winona County is set by the county, the township or the city, depending on where the lot is (such as Winona, Goodview). 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, township or city zoning office has the district and its rules. See the Winona County website.
What are the residential setbacks in Winona County (2026)?
Setbacks in Winona 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, township or city zoning office gives them for the district. See the Winona County website.
Next to Winona County: Fillmore County, Houston County, Olmsted County, Wabasha County.
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