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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Collaborating across borders

A transboundary workgroup is collaborating to improve water quality in the Nooksack River watershed. Due to those efforts, Portage Bay shellfish beds are open more often to harvesting.

Inside the effort to save Indian Creek

On the morning of July 18, a dual-tanker truck carrying thousands of gallons of gasoline and diesel left the roadway on U.S. Highway 101 and overturned into Indian Creek. 

Lower Yakima Valley nitrates in drinking water

Ecology is working with other state and local government agencies to reduce nitrate contamination so everyone in the Lower Yakima Valley has clean, safe drinking water. 

Paving the way to clean water through public art

The City of Tacoma recently completed water quality improvement projects in the Larchmont neighborhood and the Madison District with more than $6 million in Ecology funding for each project. 

Soos Creek's journey from decline to recovery

Ecology’s draft Soos Creek Fine Sediment TMDL aims to cut fine sediment in Soos Creek by improving stormwater management and restoring stream habitat to protect salmon, wildlife, and water quality.

SepticSmart Week: Funding your septic fix

Today we are focused on affordable options to repair or replace your septic system. Check out our blog on septic system basics if you are new to this topic.

Let's be septic smart together!

SepticSmart Week serves as a great reminder for homeowners to check their on-site septic systems. In Washington, about one-third of households rely on septic. That's close to one million homes!

Controlling aquatic plants and algae to support clean water

Our permit allows appropriate pesticide use to control noxious weeds that harm local ecosystems or disrupt agricultural production. We are asking for feedback on our updates to the permit.

Drayton Harbor’s bacteria problem

Help shape our plan to reduce bacteria in Drayton Harbor. Comment Aug. 21-Sept. 26, 2025, to protect shellfish, recreation, and community health.

Rattlesnake Creek is recovering

Eight years after a dam breach devastated Rattlesnake Creek, steelhead and wildlife are returning. This shows the creek’s natural resilience and the impact of ongoing restoration efforts.