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  2. Impaired Waters and TMDLs

Impaired Waters and TMDLs in Region 10

Map showing Alaska, Idaho, Oregon, Washington (EPA's Region 10)

EPA's Region 10 serves Alaska, Idaho, Oregon, Washington, and 271 native tribes.

Contact EPA's Region 10 TMDL Program.

On this page:
  • Regional actions
  • Search for TMDLs and impaired waters
  • State water quality programs

Regional Actions

  • Spokane River TMDLs (Washington) - October 2024
  • Umpqua River Basin Temperature TMDLs (Oregon) - Public comments accepted through November 25, 2024.
  • Partial approval/disapproval of Washington's 2014-2018 303d list - August 2022
  • Deschutes River TMDLs (Washington) - August 2021
  • Willamette Basin Mercury TMDL (Oregon) - February 2021
  • Columbia and Lower Snake Rivers Temperature TMDL (Washington/Oregon) - May 2020
  • Disapproval of Oregon's Revised Willamette Basin Mercury TMDL - November 2019
  • Partial approval/partial disapproval of Oregon's 2012 303(d) list - December 2018
  • Partial approval/partial disapproval of Deschutes TMDL - June 2018
  • Approval of Washington's 2012 303(d) list - July 2016

Search for TMDLs and Impaired Waters

Visit EPA's How's My Waterway to search for TMDLs and impaired waters in Region 10.


State Water Quality Programs

  • Alaska TMDLs and Alternative Recovery Plans
  • Idaho Water Quality Monitoring and Assessment
  • Idaho Total Maximum Daily Loads
  • Oregon Water Quality Assessment Program
  • Oregon Total Maximum Daily Loads
  • Washington Water Quality Assessment and 303d List
  • Washington Total Maximum Daily Loads

Impaired Waters and TMDLs

  • Program Vision
  • Impaired Waters and TMDLs throughout the U.S
  • Technical Tools and Resources
Contact Us About Impaired Waters and TMDLs
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on October 29, 2024
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