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Columbia River

About EPA's Work in the Basin

The Columbia River is the fourth largest watershed in the nation, covering parts of seven states.

Columbia River

Chemicals of Emerging Concern

Pharmaceuticals, personal care products, and other so-called "chemicals of emerging concern" can have significant environmental impacts.

Learn about EPA's research and monitoring of these chemicals in the Columbia River.

Tribal Fish Consumption

Learn about EPA's work to help document tribal fish consumption rates and potential health risks from chemical pollution in certain species of fish.

Cold Water Refuges Project

EPA is helping protect and restore vital cold water habitat to support current and future salmon populations.

Learn more about these cold water refuges in the Columbia River.