Our robust quality assurance, or QA, system gives confidence in our regulatory and scientific decisions. We rely on quality assurance policies, guidance, and requirements to monitor, improve, and ...

Lower wildfire activity and changing traffic patterns stemming from the COVID-19 pandemic reduced air pollution in sensitive ...

The Washington Department of Ecology issued penalties totaling over $1.1 million to Amazon Inc. and Walmart Inc. for illegally selling climate-polluting cooling and refrigeration products. These ...

Many locals have never seen the dense Olympia area exist without Capitol Lake at its center; they don’t know that the mouth ...

Group water systems need to participate in the adjudication by filing court claims. These water systems include cities, special purpose districts, and private systems such as neighborhoods using a ...

Grant recipients of Ecology's landfill methane emissions reduction grant program are having success reducing methane ...

We invite you to comment on two cleanup sites in the Lower Duwamish Waterway as well as a consent decree settling who will ...

Puget Sound has more than 1,400 miles of beaches, most built from sand and gravel eroded from nearby bluffs. Puget Sound's glacial history and unique geology make these feeder bluffs an important ...

Refer to the 2024 updated TAPE Process Overview for everything you need to know about how we evaluate your technology. We also accept applications to the Chemical Technology Assessment Protocol – ...

This rulemaking will update both chapters to consider recommendations from the 2025 Best Achievable Protection (BAP) workgroups. To learn more about this rulemaking and recommendations from the 2025 ...