Water Quality Standards Regulations: Wyoming
Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.
The EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. For each document listed under "State Standards in Effect for CWA Purposes", the EPA has made a reasonable effort to identify parts of the standards that are disapproved or are otherwise not in effect for CWA purposes. Additionally, please note the documents may also contain provisions that the EPA does not have the authority and duty to act on under the Clean Water Act because the provisions are not water quality standards.
State Standards in Effect for CWA Purposes
-
Water Quality Rules and Regulations, Chapter I—Wyoming Surface Water Quality Standards (pdf)
(Effective July 26, 2018) - Recreation Designated Uses Web Map
(Effective September 12, 2017) The Recreational Designated Uses Web Map displays primary and secondary contact recreation designations. Secondary contact recreation designations are based on either a statewide Categorical Use Attainability Analysis for Recreation or site-specific use attainability analyses completed in Wyoming. Please note that some use designations presented in the web map were disapproved by the EPA. Refer to the list of water bodies disapproved by the EPA.-
List of Water Bodies Disapproved by EPA for Designated Use Changes (pdf)
(Effective September 12, 2017) This table shows the ten water bodies that the EPA disapproved for designated use changes from primary contact recreation (PCR) to secondary contact recreation (SCR).
-
List of Water Bodies Disapproved by EPA for Designated Use Changes (pdf)
Wyoming's water quality standards are applicable to "waters of the State." In some limited instances, the definition adopted by Wyoming for "waters of the State" as part of its water quality standards may result in water quality standards that are more comprehensive than required under section 303(c) of the Clean Water Act and the implementing federal regulations. The EPA has included the State's water quality standards in their entirety here for context and as supplementary information for the reader.
Wyoming water quality standards apply to all waters within the State of Wyoming, with the exception of those waters that are within Indian Country, as defined in 18 U.S.C. Section 1151. EPA's approval of Wyoming's water quality standards was not intended as an action to approve or disapprove water quality standards applying to waters within Indian Country. The EPA, or eligible Indian Tribes, as appropriate, will retain responsibilities for water quality standards within Indian Country.
Federally Proposed or Promulgated Standards
- None at this time.