Information on the 2004 Water Quality Assessment Process

The 2004 list is available for informational and reference use only.

Use the most recent 303(d) list to be approved by EPA for the purposes of writing discharge permits, watershed characterization, financial assistance funding, TMDL prioritization, and TMDL implementation.


Unless otherwise specified, the following documents are available in Adobe Acrobat (.PDF file) format. To view and/or print PDF files, you first will need to download and install Adobe Acrobat Reader from this link.

  1. Overview of the 303(d) Program
  2. Water Quality Policy 1-11
    1. Additional clarifications of the assessment criteria for temperature and dissolved oxygen
    2. Additional clarifications of the binomial distribution method
  3. Data that Ecology used to conduct the Assessment
    1. List of data submitters
    2. Published Studies
  4. Summary information from the Water Quality Assessment and 2004 candidate 303(d) list submitted for EPA approval
  5. Prioritization of 303(d) listed waters
  6. Background Information on the Water Quality Assessment Process
    1. EPA 2004 Integrated Report Guidance (EPA website)
    2. Working together to Achieve Clean Water: A Progress Report (Ecology Publication)
  7. EPA approval letter for the 2004 Assessment (PDF)


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Last updated February 2009