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 ...

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 ...

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 ...

When most people think of climate change, they probably don’t think of landfills. But maybe they should: Landfills release large amounts of methane, a greenhouse gas with far greater planet-warming ...

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 ...

Nuestras colaboraciones con instalaciones de tratamiento de residuos del condado, minoristas de autopartes y tiendas para mejoras del hogar nos permiten llegar a personas de todo Washington con el ...

As the state’s lead agency managing litter programs, we operate youth and adult litter pickup crews and provide funding for litter pickup and prevention to state and local governments. We also oversee ...