Water quality

Ecology is responsible for keeping Washington waters clean and helping polluted waters recover.
Ecology is responsible for keeping Washington waters clean and helping polluted waters recover.

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EPA plan for Washington and Oregon rivers leaves salmon in hot water
We're submitting our comments on EPA temperature TMDL for the Columbia and Snake rivers.
Improving our permit that helps lake managers control aquatic plants and algae
We are looking for feedback on draft updates to the general permit for aquatic plant and algae management.
New study finds widespread PFAS contamination – but also signs of progress

Per- and poly- fluorinated alkyl substances (aka PFAS, PFCs, PFOS) are building up in waterways and fish, but phasing them out could decrease chemical exposure.

Reclaimed water in Sammamish Valley to benefit community

All water on earth is recycled, thanks to nature. This new permit for King County will help speed up the natural process and reuse water. 

Restore Our Earth
Earth Day is just a few days away. Read about what we’ve got in store and learn about ways you can “Restore Our Earth”.
Clean & safe water for communities
This summer, scientists plan to sample 170 wells as part of the larger effort to address elevated nitrate in the Lower Yakima Valley.
Ecology focuses on salmon recovery, protecting state waters, and climate resilience in 2022 legislative session
Washington’s environment is worth protecting, preserving, and restoring. We’re hopeful for the potential to advance our environmental protection in the 2022 legislative session.
Fecal Matters: Saltwater State Park is now open for water recreation, King County
Seattle & King County Public Health re-opened Saltwater State Park
Sprague Lake water level study set to begin
We're partnering with Washington Department of Fish and Wildlife to help identify flood risk solutions for Sprague Lake.
New plan to address bacteria in Whatcom Creek Watershed
Water quality monitoring shows that fecal bacteria are polluting the Whatcom Creek watershed. We've developed a draft plan to get to clean water.