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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Even tiny pollution makes a big problem for water quality

Looking for feedback on tools to address pollution in the Spokane River. 

Ecology considers General Permit to control nutrients in Puget Sound

Excess levels of nutrients from human sources are harming Puget Sound. 

Puget Sound Nutrient Watch: The Salish Sea Computer Model

We explain how the Salish Sea Model and other scientific computer models help us better understand the world around us.

By managing stormwater, cities and counties are helping to protect Washington’s waters
Reducing stormwater pollution helps prevent toxins from entering the water and harming orca and salmon.
Puget Sound Nutrient Watch: What is the Problem with Nutrients?

Our third installment of Puget Sound Nutrient Watch focuses on Puget Sound's excessive nutrients.

Lots of thoughtful feedback received as we update the CAFO permit
We appreciate that so many citizens, producers, groups and organizations took their time to give us thoughtful comments on the permit we're updating for concentrated animal feeding operations.
Commercial net pen aquaculture planning meeting March 23
You are invited to attend the next planning meeting for updating the Recommendations for Managing Commercial Net Pen Aquaculture in Washington's straits and estuaries.
Clean water funding continues to support local communities

This year, we’re proposing $188 million in financial assistance for 165 high-priority clean-water projects.

2019 funding awarded to support clean water in Washington’s communities

Ecology is offering more than $155 million in financial assistance for 69 high-priority clean water projects across Washington state.

Finding a balanced approach for aquatic plant management
Our draft environmental study reviews eight new chemicals, five alternatives for management, and updates information on other chemicals currently covered under the permits.