An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Columbia River

About EPA's Work in the Basin

Section 123 of the Clean Water Act was the first legislation to officially designate the national importance of restoration efforts in the Columbia River Basin.  

Learn more about EPA's role and the work we're doing.

Columbia River

Cold Water Refuges

EPA is helping to protect and restore vital cold water habitat to support salmon and steelhead in the Columbia River.

Tribal Fish

EPA is working with tribes to document fish consumption and potential health risks from chemical pollution in fish.

Chemicals of Emerging Concern

EPA is leading efforts to conduct research and monitoring for pharmaceuticals, personal care products, and other so-called "chemicals of emerging concern."