Environmental Rules in Sun Prairie, WI (2026)
4 verified environmental rules for Sun Prairie, Wisconsin, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Sun Prairie requires a stormwater management permit from the city engineering department before any development adds 20,000 square feet of impervious surface, subdivides land, or files a certified survey map for commercial or industrial use. Discharging pollutants into the municipal storm sewer system, drainage ways, lakes, streams or wetlands anywhere in the city is a separate, standalone violation under Chapter 15.30.
Sun Prairie Stormwater Management Permit Rules
Some RestrictionsSun Prairie Code of Ordinances §§ 15.30.030(A)(1), 15.30.210, 15.30.260(A)
Unless otherwise exempted by Section 15.30.040, a stormwater management permit shall be required and all stormwater management provisions of this chapter shall apply, to any of the following activities within the city of Sun Prairie:1.Any development(s) after August 22, 2001, that result(s) in the cumulative addition of twenty thousand (20,000) square feet of impervious surface to the site. ......
Erosion Control
Sun Prairie requires an erosion control permit before disturbing 4,000 square feet or more of land, grading on slopes steeper than 12%, or moving 400 cubic yards of dirt, and separately bans letting eroded dirt or sediment reach adjacent land, streets or waterways from any site.
Sun Prairie Construction Erosion Control Rules
Some RestrictionsSun Prairie Code of Ordinances §§ 15.28.030(B), 15.28.070(C), 15.28.110(F)(1)(a)
An area of four thousand (4,000) square feet or greater that will be disturbed by grading, removal of protective ground cover or vegetation, excavation, land filling or other land disturbing activities, or activities on a slope steeper than twelve percent (12%); ... In addition to the permit requirements set forth in this chapter, no person shall cause or permit erosion or the tracking or dropp...
Vehicle Idling Restrictions
Sun Prairie bans letting a parked vehicle's engine idle for more than five consecutive minutes on any public street, highway, or place open to the public. Exceptions cover extreme temperatures, defrosting, repairs, and traffic delays outside the driver's control, under Code § 10.16.050(B).
Sun Prairie Vehicle Idling Time Limit
Some RestrictionsSun Prairie Code of Ordinances § 10.16.050(B), (D)
B.Violation. No person shall cause or permit the engine of any motor vehicle to operate in idle for longer than five consecutive minutes while stopping, standing, or parking on any highway or place open to the public. ... D.Exceptions. The following periods of idling by any motor vehicle shall be exempted from subsection (B) of this section:1.Idling as needed when the ambient temperature is bel...
Flood Elevation Requirements
In the City of Sun Prairie's mapped floodfringe, new and substantially improved residential structures must have their lowest floor raised on fill to the flood protection elevation, a level set two feet above the Regional Flood Elevation under Chapter 17.28.
Sun Prairie Flood Protection Elevation Rule
Some RestrictionsSun Prairie Code of Ordinances § 17.28.030(D)(3)(a)
i.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. ... 34."Flood protection elevati...
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