Environmental Rules in Casper, WY (2026)
4 verified environmental rules for Casper, Wyoming, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Casper Municipal Code Chapter 13.49 bans discharging anything but stormwater into the city's storm drain system or watercourses, and bars illicit connections such as sewage lines tied into storm drains, to meet Clean Water Act and Wyoming Water Quality Standards. The city manager enforces it, and violations are misdemeanors.
Casper Stormwater Discharge Control Rules
Some RestrictionsCasper Municipal Code § 13.49.090
No person shall discharge or cause to be discharged into the municipal storm drain system or watercourses any materials, including, but not limited to, pollutants or waters containing any pollutants that cause or contribute to a violation of Wyoming Water Quality Standards, other than stormwater. The commencement, conduct or continuance of any illegal discharge to the storm drain system is proh...
Erosion Control
Casper requires an erosion and sediment control permit from the community development office before any construction activity disturbing one acre or more within city limits, backed by a security deposit starting at ten cents per square foot and liability insurance of at least $250,000 per claim.
Casper Erosion and Sediment Control Permit
Significant RestrictionsCasper Municipal Code §§ 12.20.030, 12.20.080(A)
12.20.030 - Erosion and sediment control—Permit requirements. It is unlawful for any person to do any construction activity that disturbs areas one acre or greater in size within the corporate limits of the city, except as exempted by Section 12.20.040 of this chapter, or cause the same to be done, without first obtaining a permit for such construction activity from the community development of...
Flood Zones
In the City of Casper, any development within a federally mapped special flood hazard area needs a development permit issued by the floodplain administrator. Casper Municipal Code section 17.20.050 designates the community development director as floodplain administrator, and section 17.20.070 requires permit applications showing elevations, structure plans, and floodproofing certifications before construction can begin.
Casper Floodplain Development Permits
Some RestrictionsCasper Municipal Code §§ 17.20.050, 17.20.070
The community development director is appointed the floodplain administrator to administer and implement the provisions of this chapter and other appropriate sections of 44 CFR (National Flood Insurance Program Regulations) pertaining to floodplain management. ... An application for a development permit shall be presented to the floodplain administrator on forms furnished by him/her and may inc...
Flood Elevation Requirements
In the City of Casper, new and substantially improved residential structures inside a mapped flood hazard area must have their lowest floor built at least one foot above the base flood elevation. Casper Municipal Code section 17.20.100(A)(1) sets that freeboard requirement and requires a registered professional's elevation certification before the floodplain administrator signs off.
Casper Base Flood Elevation Rule
Some RestrictionsCasper Municipal Code § 17.20.100(A)(1)
1.Residential Construction. New construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevated no less than one foot above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection as proposed in Secti...