Environmental Rules in Winnebago County, WI (2026)

Winnebago County Code Ch. 23 (Town/County Zoning), Article 15, § 23.15 S.03 & S.10(1)(b)-(c), Construction Site Erosion Control & Stormwater Management Ordinance

This ordinance applies to land-disturbing construction activity, new land development, and all land redevelopment activity located within the boundaries and jurisdiction of the unincorporated portion of Winnebago County... Those involving grading, removal of protective ground cover or vegetation, excavation, land filling or other activity affecting a surface area of 4,000 square feet or more; T...

Winnebago County Code Ch. 23 § 23.15, Section B, S.15(1) (Article 15 – Stormwater Management)

A permit shall be required for all construction sites with one acre or more of land disturbance, and to sites of less than one acre if they are a part of a larger common plan of development or sale. A permit shall be required for land development or redevelopment which increases impervious surfaces greater than 15,000 square feet. The total area of imperious surfaces shall be considere...

Winnebago County Code Ch. 26 § 26.1-3(a) (Jurisdiction)

Unincorporated areas of the county. This chapter applies to those areas in the unincorporated area of Winnebago County that would be covered by the regional flood or base flood as shown on the adopted flood insurance rate maps (FIRMs) or other maps approved by the Department of Natural Resources. Base flood elevations are derived from the flood profiles in the flood insurance study and are...

Winnebago County Code Ch. 23 §§ 23.8-446, 23.8-65(b)(11) (Town/County Zoning)

A boat dock shall comply with all rule and regulations established in state statutes and administrative rules established pursuant to those statutes. ... boat docks and boathouses when located in a shore yard, but not closer than 3 feet to a side yard property boundary line.

Winnebago County Code Ch. 26 § 26.5-23(b)(1) (Development standards — Residential structures, Floodfringe District); freeboard defined at § 26.3-2(34)

The elevation of the lowest floor shall be at or above the flood protection elevation on fill unless the requirements in subsection (b)(2) can be met. The fill shall be one foot or more above the regional flood elevation extending at least 15 feet beyond the limits of the structure. (2) The basement or crawlway floor may be pla...