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Impaired Waters and TMDLs

Deschutes River TMDLs


On July 31, 2020, EPA established Total Maximum Daily Loads (TMDLs) within the Deschutes River watershed in Washington (see Documents below).

The TMDLs are being established to replace portions of the State of Washington’s 2015 Deschutes River, Percival Creek, and Budd Inlet Tributaries TMDLs that EPA partially disapproved in June 2018.

EPA’s TMDLs use the Washington Department of Ecology’s original water quality model and data, while calculating new loadings to ensure compliance with Clean Water Act requirements and protection of the water quality standards in Washington.

New TMDLs were developed for sediment, bacteria, dissolved oxygen, pH, and temperature.

EPA accepted public comments on the TMDLs from August 7 through October 7.

After considering comments, EPA may make modifications, as appropriate, and then transmit the TMDLs to the Washington Department of Ecology to incorporate into its current water quality management plan.

Questions? Contact Miranda Magdangal, 206-553-0692, or Lisa Kusnierz (, 208-378-5626.


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