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Washington State's Water Quality Assessment [303(d)]

Washington State's Water Quality Assessment lists the status of water quality for a particular location in one of 5 categories recommended by EPA. This Assessment represents the Integrated Report for Sections 303(d) and 305(b) of the Clean Water Act.

The 303(d) list reports on category 5 waters, the impaired waters of the state. Waters placed on Category 5 require the preparation of a plan to improve water quality by limiting pollutant loads.  "Total Maximum Daily Loads" (TMDLs) are a key tool in the work to clean up polluted waters.

• Introduction to Washington State's Water Quality Assessment
• Overview of the Water Quality Assessment
• Information on Ensuring Credible Data for Water Quality Management and the Revision to the 303(d)/305(b) Integrated Assessment Report Policy (Policy 1-11) Documents
• Information on the 2008 Integrated Water Quality Assessment (305[b] report and 303[d] list)
  • View the 2008 Assessment (305[b] report and 303[d] list)
  • View the 2008 Assessment focus sheet
• Historical Information on Washington State’s Water Quality Assessments, 303(d) Lists & 305(b) Reports
• Differences between the Recent 303(d) Lists
• Water Quality Assessment Categories
• View descriptions of local water quality improvement efforts:
  • Category 4b listing descriptions
  • Water Quality Improvement Projects (TMDLs)
• The 305(b) Report
• Related Links
• For more information