• State Standards in Effect for CWA Purposes
• Federally Proposed or Promulgated Standards

State Standards in Effect for CWA Purposes

• [See Water Quality Rules and Regulations, Chapter I—Wyoming Surface Water Quality Standards ]
  (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 EPA. Refer to the list of water bodies disapproved by EPA.
  • [See List of Water Bodies Disapproved by EPA for Designated Use Changes ]
    (Effective September 12, 2017) This table shows the ten water bodies that EPA disapproved for designated use changes from primary contact recreation (PCR) to secondary contact recreation (SCR).

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. 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. 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.

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• Water Quality Rules and Regulations, Chapter I—Wyoming Surface Water Quality Standards (PDF)(60 pp, 793 K)
• List of Water Bodies Disapproved by EPA for Designated Use Changes (PDF)(2 pp, 286 K)