About EPA's Work in the Basin
The Columbia River is the fourth largest watershed in the nation, covering parts of seven states. Learn about the watershed and some of the EPA-supported efforts to help protect it.
Cold Water Refuges Project
EPA is helping protect and restore vital cold water habitat to support current and future salmon populations. Learn more about Columbia River Cold Water Refuges.
Chemicals of Emerging Concern
Pharmaceuticals, personal care products, and other chemicals in the environment can have significant impacts on human health and aquatic life. Learn about EPA's research and monitoring efforts regarding these so-called "chemicals of emerging concern" in the Columbia River.