Impaired Waters and TMDLs in 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
- Partial approval/disapproval of Washington's 2014-2018 303d list
- Deschutes River TMDLs (Washington)
- Columbia and Lower Snake Rivers Temperature TMDL (Washington/Oregon)
- Willamette Basin Mercury TMDL (Oregon)
- 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.