Changes to designated uses are modifications to the designated uses assigned to a surface water or group of surface waters when the currently assigned designated uses are not attainable or sufficiently protective.
Changes to designated uses are made on an ongoing basis, as necessary and after consideration of public comment, by the Administrator of the Water Quality Division. Designated uses must protect both existing uses present in a surface water as well as those that are attainable. A scientific evaluation of the factors affecting attainment, including physical, chemical, biological or economic considerations, known as a use attainability analysis, must be completed to support the designated use changes. The Wyoming-Surface-Water-Classification-List or recreation designated uses web map are updated as changes are approved.
Lindsay Patterson, Program Supervisor (Cheyenne)
Surface Water Quality Standards