Site-Specific Criteria

Site-specific criteria are water quality criteria developed to protect a surface water or group of surface waters when the base water quality criteria in Wyoming’s Surface Water Quality Standards are not attainable or sufficiently protective. Site-specific criteria are developed on an on-going basis and adopted into Appendix C of the Water Quality Rules, Chapter 1, Wyoming’s Surface Water Quality Standards, during the formal rulemaking process. Each site-specific criterion must protect both the 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 site-specific criteria.