Environmental Rules in Wyoming (2026)
10 rules on the books across Wyoming, 2 cities and counties. Select a rule to read the full details.
Severity: Few Restrictions · Light Restrictions · Some Restrictions · Significant Restrictions · Heavy Restrictions
Stormwater Management
Requirements for managing rainwater runoff on your property, including retention basins, permeable surfaces, and drainage plans.
Wyoming: statewide
StatewideHeavy RestrictionsThe Wyoming Department of Environmental Quality administers the Wyoming Pollutant Discharge Elimination System, which…
Read full rule →Cheyenne
Significant RestrictionsCheyenne bans dumping anything but rain into the storm drain system, and the city engineer enforces it under the Urban…
Read full rule →Casper
Some RestrictionsCasper Municipal Code Chapter 13.49 bans discharging anything but stormwater into the city's storm drain system or…
Read full rule →Erosion Control
Rules to prevent soil erosion during construction and landscaping, including required sediment barriers and ground cover standards.
Wyoming: statewide
StatewideHeavy RestrictionsWyoming requires erosion and sediment controls on construction sites under WYPDES Construction General Permits issued…
Read full rule →Casper
Significant RestrictionsCasper requires an erosion and sediment control permit from the community development office before any construction…
Read full rule →Cheyenne
Some RestrictionsAny construction project in Cheyenne covered by a WYPDES construction stormwater permit must comply with that permit's…
Read full rule →Flood Zones
Building requirements for properties in FEMA flood zones, including elevation standards, flood insurance mandates, and construction limits.
Casper
Some RestrictionsIn the City of Casper, any development within a federally mapped special flood hazard area needs a development permit…
Read full rule →Cheyenne
Some RestrictionsNew homes and additions in Cheyenne's mapped flood hazard areas need a development permit and must sit at least one…
Read full rule →Flood Elevation Requirements
FEMA NFIP minimum base flood elevation (BFE) construction standards for properties in mapped flood zones, including freeboard requirements above BFE.
Casper
Some RestrictionsIn the City of Casper, new and substantially improved residential structures inside a mapped flood hazard area must…
Read full rule →Cheyenne
Some RestrictionsCheyenne requires new and substantially improved structures in mapped flood hazard areas to sit at least one foot above…
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