Environmental Rules in Grant County, WI (2026)
4 rules for unincorporated Grant County, Wisconsin.
Verified from official government sources
Stormwater Management
In unincorporated Grant County, Wisconsin, every plat and subdivision must provide for the adequate disposal of surface water, either to a natural drainage course or to a storm sewer system approved by the County Engineer. Section 305-23 of the Grant County Subdivision Regulation Ordinance sets the rule, and the Planning and Zoning Committee reviews each plat against it.
Grant County WI Subdivision Drainage and Stormwater Rules
Some RestrictionsGrant County Code § 305-23
§ 305-23. Utilities and drainage. All plats and subdivisions shall meet the following requirements: ... B. Drainage. (1) Provision shall be made for the adequate disposal of surface water either to a natural drainage course or to a storm sewer system, as approved by the County Engineer. (2) All surface drainage facilities shall connect to an adequate drainage course. (3) Land that is subject to...
Erosion Control
In unincorporated Grant County, Wisconsin, a permit is required for filling or grading within 300 feet landward of navigable water, where surface drainage runs toward the water, on any slope of more than 20%, more than 1,000 square feet on 12% to 20% slopes, or more than 2,000 square feet on slopes under 12%. Section 316-34 attaches erosion conditions to each permit.
Grant County WI Shoreland Grading and Erosion Control Rules
Some RestrictionsGrant County Code § 316-33
§ 316-33. Permit required. ... Except as provided in § 316-32, a permit is required: A. For any filling or grading of any area which is within 300 feet landward of the ordinary high-water mark of navigable water and which has surface drainage toward the water and on which there is either: (1) Any filling or grading on slopes of more than 20%. (2) Filling or grading of more than 1,000 square fee...
Flood Zones
Chapter 290 regulates every area in unincorporated Grant County, Wisconsin, covered by the regional or base flood on the FEMA Flood Insurance Rate Map or other DNR-approved maps. Section 290-7 splits that land into three districts: Floodway, Flood-Fringe and General Floodplain. A land use permit is required before new development, and violations carry a forfeiture of $40 to $50 plus costs.
Floodplain Zoning in Unincorporated Grant County, WI
Significant RestrictionsGrant County Code §§ 290-5, 290-7
This chapter regulates all areas that would be covered by the regional flood or base flood as shown on the Flood Insurance Rate Map (FIRM) or other maps approved by the DNR. Base flood elevations are derived from the flood profiles in the Flood Insurance Study (FIS) and are shown as AE, A1-30, and AH Zones on the FIRM. Other regulatory zones are displayed as A and AO Zones. ... The regional flo...
Flood Elevation Requirements
In unincorporated Grant County, Wisconsin, the flood protection elevation is two feet of freeboard above the regional flood water surface profile. Under § 290-27, a new home in the flood-fringe needs its lowest floor at or above that elevation on fill one foot or more above the regional flood elevation, and no basement or crawlway floor can sit below the regional flood elevation.
Flood Protection Elevation in Unincorporated Grant County, WI
Significant RestrictionsGrant County Code §§ 290-27, 290-46
A. Residential uses. Any structure, including a manufactured home, which is to be newly constructed or moved into the flood-fringe, shall meet or exceed the following standards. Any existing structure in the flood-fringe must meet the requirements of Article VI, Nonconforming Uses; (1) The elevation of the lowest floor shall be at or above the flood protection elevation on fill unless the requi...
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