Environmental Rules in Fond du Lac County, WI (2026)
5 rules for unincorporated Fond du Lac County, Wisconsin.
Verified from official government sources
Stormwater Management
New development in unincorporated Fond du Lac County that splits a parcel into five or more lots or adds 20,000 square feet or more of impervious surface must get a stormwater management permit under County Code Sec. 27-104. The Land and Water Conservation Department reviews the plan, and violators face a forfeiture of $100 to $500 per day under Sec. 27-113.
Fond du Lac County Stormwater Permit Rules
Some RestrictionsFond du Lac County Code §§ 27-104, 27-113
Unless otherwise exempt under section 27-104(1)(b), all stormwater management provisions of this chapter shall apply to all land developing activity that meet any of the following and a permit under section 27-108 shall be required:1.Divides an existing tax parcel into five separate parcels of, regardless of size, within a common plan of development;2.Ultimately results in the addition of imper...
Erosion Control
Land-disturbing construction on 4,000 square feet or more of unincorporated Fond du Lac County requires an erosion and sediment control permit from the County Land and Water Conservation Department under Code Sec. 27-4. Smaller sites still must follow baseline standards, and violators face a forfeiture of $100 to $500 per day under Sec. 27-12.
Fond du Lac County Erosion Control Permit
Some RestrictionsFond du Lac County Code §§ 27-4, 27-12
1.A permit is required for a construction site with 4,000 square feet or greater of land disturbing construction activity. ... Any person violating any of the provisions of this article shall be subject to a forfeiture of not less than $100.00 nor more than $500.00 and the costs of prosecution for each violation. Each day a violation exists shall constitute a separate offense.
Flood Zones
Unincorporated land mapped in the floodway of Fond du Lac County is limited to open-space uses like farming, parks and boat ramps; habitable structures and most new fill are barred outright. County Code Sec. 28-42 lists what's allowed, Sec. 28-43 requires an engineering study for any encroachment, and violators face a forfeiture of up to $50 per day under Article IX.
Fond du Lac County Floodway Development Rules
Significant RestrictionsFond du Lac County Code §§ 28-41, 28-43, Ch. 28 Art. IX
This section applies to all floodway areas on the floodplain zoning maps and those identified pursuant to section 28-71(5). ... Any encroachment in the regulatory floodway is prohibited unless the data submitted for section 28-43(1)(b) above demonstrates that the encroachment will cause no increase in flood elevations in flood events up to the base flood at any location or removes the encroache...
Boat Dock Permits
Building or maintaining a pier, dock, or walkway on pilings within the shoreland-wetland district of unincorporated Fond du Lac County doesn't require a county land use permit under Code § 44-53(2)e, so long as the work involves only limited excavating and filling.
Boat Dock Rules in Fond du Lac County Shorelands
Light RestrictionsFond du Lac County Code §§ 44-53(2)e, 44-352(a)
(2)Uses which do not require the issuance of a permit and which may include limited filling, flooding, draining, dredging, ditching, tiling, or excavating but only to the extent specifically provided below: ... e.The construction or maintenance of piers, docks or walkways built on pilings, including limited excavating and filling necessary for such construction and maintenance; ... (a)When requ...
Flood Elevation Requirements
In the floodway, floodfringe and general floodplain districts of unincorporated Fond du Lac County, new residential construction and substantial improvements must have the lowest floor built to or above the flood protection elevation: the regional flood elevation plus two feet of freeboard. Fill must extend at least 15 feet beyond the structure, and a zoning administrator permit is required before construction begins.
Fond du Lac County Flood Protection Elevation Rule
Some RestrictionsFond du Lac County Code § 28-58(1)(a); Art. X (Definitions)
(a)All new construction, including placement of manufactured homes, and substantial improvement of residential structures, shall have the lowest floor elevated to or above the flood protection elevation on fill. The fill around the structure shall be one foot or more above the regional flood elevation extending at least 15 feet beyond the limits of the structure. No area may be removed from the...
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