Prior Lake regulates stormwater under its MS4 permit and the Prior Lake Spring Lake Watershed District rules. Construction sites disturbing 1 acre or more need an NPDES permit; smaller sites still require local erosion control.
As an MS4 (Municipal Separate Storm Sewer System) permittee under the Minnesota NPDES program, Prior Lake enforces stormwater rules through Chapter 5 and shoreland overlay provisions. Construction projects disturbing one acre or more (or less than one acre but part of a common plan) must obtain an MPCA Construction Stormwater General Permit and implement a stormwater pollution prevention plan (SWPPP). Smaller projects still need silt fence, erosion blankets, and sediment control measures per the city's grading and erosion ordinance. The Prior Lake Spring Lake Watershed District has independent permitting jurisdiction over wetland impacts, drainage, and floodplain work. Illicit discharges into the storm sewer system (oil, paint, sewage) are prohibited.
Stormwater violations are misdemeanors with fines up to $1,000 per day under the city code, plus MPCA civil penalties up to $10,000 per day under Minn. Stat. Sec. 115.071 for NPDES violations.
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Prior Lake, MN
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Prior Lake, MN
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Prior Lake, MN
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Prior Lake, MN
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Prior Lake, MN
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