Cheyenne operates an MS4 stormwater program under EPA Phase II. Construction sites disturbing one acre or more need stormwater permits, and illicit discharges to storm drains feeding Crow Creek are prohibited.
Cheyenne is a regulated small Municipal Separate Storm Sewer System (MS4) under the Clean Water Act. The city requires a Stormwater Pollution Prevention Plan (SWPPP) for projects disturbing one acre or more, with best management practices like silt fence, inlet protection, and stabilized construction entrances. Discharging anything other than rainwater into city storm drains, including soapy car-wash runoff, paint, concrete slurry, and yard waste, is prohibited. Drains ultimately route to Crow Creek and downstream tributaries of the South Platte basin. Violations can be reported to the Cheyenne Engineering Division.
Illicit discharges, missing erosion controls, or unpermitted earthwork over one acre may trigger stop-work orders, daily fines, and required cleanup of impacted drainages by the responsible party.
Cheyenne, WY
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See how Cheyenne's stormwater management rules stack up against other locations.
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