Environmental Rules in Cheyenne, WY (2026)
5 verified environmental rules for Cheyenne, Wyoming, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
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 Stormwater Permit Rules
Some RestrictionsErosion Control
Cheyenne requires erosion and sediment control on graded sites because High Plains winds and summer thunderstorms move loose soil rapidly. Silt fencing, mulching, and stabilized exits are standard for active construction.
Erosion Control on High Plains Sites
Some RestrictionsFlood Zones
Cheyenne participates in the National Flood Insurance Program. Crow Creek and Dry Creek floodplains carry Special Flood Hazard Area designations, and substantial improvements within them must meet elevation standards.
Crow Creek FEMA Flood Zones
Some RestrictionsDefensible Space
Cheyenne and Laramie County properties in grass-fire-prone areas are urged to maintain defensible space. Tall dry grass, cured cheatgrass, and brush near structures fuel fast-moving High Plains wildfires under chinook winds.
High Plains Defensible Space Practices
Some RestrictionsClimate Emergency Mobilization
Cheyenne has not adopted a binding climate emergency declaration or formal climate action plan. Sustainability efforts are limited to specific operational measures rather than a comprehensive citywide greenhouse gas reduction policy.
Cheyenne Climate Planning Status
Few RestrictionsLooking for Laramie County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Cheyenne city rules.
Environmental Rules in Laramie County →