Water Quality Standards Support Documents

This page provides supporting materials for new or updated water quality standards. These documents explain the regulatory and scientific basis for the standards and offer implementation guidance for Division of Water Quality (DWQ) programs and permittees.

Standards Support Documents

• 2025 Methylmercury in Fish Tissue Implementation
• 2023 Site-specific ammonia water quality criteria for the Jordan River, Little Cottonwood Creek, State Canal, Surplus Canal, and Mill Creek: Criteria Support Document
• 2022 Aluminum Criteria Implementation
• 2020 Jordan River Temperature Use Attainability Analysis
• 2020 Kanab Creek Use and Value Assessment and Revised Criteria for Dissolved Solids
• 2019 Standards Revisions Support Document
  
  • Attachment 2: Criteria Support Document: Site-specific criteria based on recalculated aquatic life water quality criteria for ammonia for a segment of Mill Creek and the Jordan River, Salt Lake County, Utah
  • Attachment 3: Criteria Support Document: Use and Value Assessment and Site-specific Criteria for Total Dissolved Soils (TDS): Silver Creek, Version 2.2
• 2018 Standards Revisions Support Document  
• 2017 Historical Survey of Unionid Mussels and Nonpulmonate Snails for Utah and Colorado
• 2017 Study Plan for Historical Surveys of Unionid Mussels and Nonpulmonate Snails
• 2013 Site-specific TDS criteria for Blue Creek and Blue Creek Reservoir
• 2009 Site-specific TDS and Sulfate Criteria for Quitchupah Creek, Emery County, Utah 
• 2008 Selenium Standard for Great Salt Lake