Shiawassee County, MI zoning map, flood zone and property lines by address
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Towns in Shiawassee County: Owosso, New Haven, Corunna.
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 Shiawassee County has 42 FIRM panels, the newest effective September 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 Shiawassee 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 Michigan county parcel layers (each county publishes its own), so a Shiawassee lot shows the same lines the township or city assessor draws. Shiawassee County covers about 339,921 acres of land and 6,282 acres of water.
Mapped lines are approximate. The Shiawassee County township or city assessor keeps the parcel record (Shiawassee County website); a licensed surveyor sets the true corners.
Zoning
In Michigan zoning is set by the county, the township, or the city or village, depending on where the lot is: in Shiawassee County, Owosso, New Haven, Corunna 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 township or city zoning office has the district, the uses it allows and the lot size it needs. The Shiawassee County website lists the county's municipalities.
ADU and guest houses
Under Michigan Zoning Enabling Act (Public Act 110 of 2006, MCL 125.3101 and following), the county, the township, 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 Shiawassee lot can add one depends on its district; the 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. Shiawassee County is soil survey area MI155, Shiawassee County, Michigan, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Shiawassee County needs a permit from the Shiawassee County health department (local health department, under Michigan EGLE onsite wastewater rules).
Setbacks
Setbacks in Shiawassee County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the township or city zoning office gives them for the lot's district, and Owosso, New Haven, Corunna for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Shiawassee lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Shiawassee 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 Shiawassee County has 42 panels, the newest effective September 2011. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Shiawassee County?
Open the Michigan map, type the address, and the parcel outline from the Shiawassee County township or city 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 Shiawassee County?
Zoning in Shiawassee County is set by the county, the township, or the city or village, depending on where the lot is (such as Owosso, New Haven). ParcelSheet shows the use code on the parcel record and names the municipality; the township or city zoning office has the final word.
Can I build an ADU in Shiawassee County?
Under Michigan Zoning Enabling Act (Public Act 110 of 2006, MCL 125.3101 and following), the county, the township, or the city or village, depending on where the lot is can allow an accessory dwelling unit, and each sets its own rules. In Shiawassee County ask the 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 Shiawassee County?
Yes. A new or changed septic system in Shiawassee County needs a permit from the Shiawassee County health department (local health department, under Michigan EGLE onsite wastewater rules). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area MI155 (Shiawassee County, Michigan).
What can I build on 5 acres in Shiawassee County?
Zoning in Shiawassee County is set by the county, the township, or the city or village, depending on where the lot is (such as Owosso, New Haven). 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 township or city zoning office has the district and its rules. See the Shiawassee County website.
What are the residential setbacks in Shiawassee County (2026)?
Setbacks in Shiawassee 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 township or city zoning office gives them for the district. See the Shiawassee County website.
Next to Shiawassee County: Clinton County, Genesee County, Gratiot County, Ingham County, Livingston County, Saginaw County.
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