FEMA flood zone rules in New Berlin, WI — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
New Berlin regulates floodplain development through Article IXA (Floodplain Zoning) of Chapter 275, in conformance with Wis. Stat. Sec. 87.30 and Wis. Admin. Code Chapter NR 116, plus 44 CFR Parts 59-72 of the National Flood Insurance Program. The city has mapped 100-year floodplain along Poplar Creek, Deer Creek, Root River, Calhoun Creek, Tess Corners Creek, Underwood Creek, the Fox River drainage, and the Upper Kelly Lake Tributary. All development in the 100-year floodplain - including buildings, filling, excavation, and fences - requires a zoning permit from the Department of Community Development. The 50% substantial-improvement rule applies to any repair or improvement to existing structures.
Chapter 275, Article IXA establishes New Berlin's Floodplain Zoning regulations, adopted under Wis. Stat. Sec. 87.30, which requires every Wisconsin municipality with mapped floodplain to adopt and enforce a floodplain zoning ordinance meeting the minimum standards of Wis. Admin. Code Chapter NR 116 and 44 CFR Parts 59-72. The Code provisions supersede any Waukesha County general zoning provisions relating to shorelands, wetlands, and floodplains within the city's corporate limits. The Official Floodplain Zoning Map, on file in the Department of Community Development, delineates the regional flood (1% annual chance, also called the 100-year flood) along Poplar Creek, Deer Creek, Root River, Calhoun Creek, Tess Corners Creek, Underwood Creek, and the Upper Kelly Lake Tributary - all part of the Fox River and Lake Michigan drainage basins. New Berlin is in Waukesha County (FEMA Community Identifier 550498); FEMA Digital Flood Insurance Rate Maps for Waukesha County form the regulatory basis. Under NR 116 standards, the regulatory floodway prohibits new residential structures and most fill, while the flood fringe permits development only if the lowest floor of any habitable space is elevated to or above the flood protection elevation (regional flood elevation plus freeboard, typically 2 feet under NR 116.13). The substantial-improvement rule (44 CFR 59.1 and NR 116) requires that if repair or improvement costs exceed 50% of the structure's market value (excluding land), the entire building must be brought up to current floodplain standards. Municipal Code Sec. 137-7 separately prohibits depositing materials in watercourses, including stormwater ditches. Floodplain inquiries: Planning and Zoning Division at (262) 786-8610 ext. 2400.
Wis. Stat. Sec. 87.30(2) and Wis. Admin. Code NR 116.21 require local enforcement. Violations - including filling, structural development, or new habitable construction in the floodway, building below the flood protection elevation in the flood fringe, or depositing material in a watercourse contrary to Sec. 137-7 - can result in citations, daily forfeitures, restoration orders, denial of occupancy, and loss of NFIP eligibility for the property. Misrepresenting elevation data on a permit application is independently actionable. Failure of New Berlin to enforce its floodplain ordinance could lead to community suspension from the NFIP under 44 CFR Part 59.
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