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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The data-driven path to clean water

We've submitted our latest Water Quality Assessment to EPA and we've opened the Call for Data to work on the next assessment of state waters. 

Aiding salmon recovery by uncovering sources of toxic chemicals

To support salmon recovery, our research identifies how toxic flame retardants move through and build up in the Snohomish River, making their way into the bodies of juvenile Chinook salmon.

Every day is Earth Day

For Ecology, Earth Day is more than just one day a year — it’s our mission every day.

Join us to talk temperature on the Columbia and Lower Snake rivers

Join us virtually on March 17, 2025, to learn more about our agency’s efforts in developing a strategy to achieve healthy water temperatures within the Columbia and Lower Snake rivers.

Ecology proposes to fund 102 clean water projects across the state

We're proposing to award $175.5 million for 102 high-priority clean water projects across the state.

Balancing wildlife conservation and wastewater infrastructure in Pasco

The expansion of the Pasco Process Water Reuse Facility has been an example of how working together can lead to successful wildlife conservation and clean water infrastructure projects.   

Ecology issues final water quality permit for Everett’s Water Pollution Control Facility

We've issued the final water quality permit for Everett's Water Pollution Control Facility, which will go in effect on Jan. 1, 2025.

Updates to a permit that helps remove noxious weeds

We're proposing the changes to the 2025 draft Zostera japonica permit that is used to control this noxious weed on clam beds in Willapa Bay. 

Tracking residential wastewater and stormwater rates

Our interactive data dashboard helps organize information about residential wastewater and stormwater costs to prioritize future clean water projects and funding needs.

Diving into the data on Washington’s water quality

The Water Quality Assessment has millions of data points on rivers, streams, lakes, and marine waters across Washington state.