Ecology is at work statewide to protect your air, water and quality of life. Learn more about our regional work.

Our Eastern Region (ERO) includes Adams, Asotin, Columbia, Ferry, Franklin, Garfield, Grant, Lincoln, Pend Oreille, Spokane, Stevens, Walla Walla, and Whitman counties. Waters of the state belong to ...

We provide a wide variety of educational classes and trainings. We also offer ideas and opportunities for you to get involved in protecting the environment at home and in your community.

Our Southwest Region (SWRO) includes Clallam, Clark, Cowlitz, Grays Harbor, Jefferson, Lewis, Mason, Pacific, Pierce, Skamania, Thurston, and Wahkiakum counties ...

We are investing $141 million from the Volkswagen federal settlement and state penalty in projects that reduce emissions from transportation, and improve air quality and people's health. Funds for ...

CLARC February 2025 updates are now online. We made updates to incorporate newly published IRIS toxicity values for arsenic and PFHxS and associated noncancer effects information. We also updated ...

The Padilla Bay Reserve offers a variety of educational programs for school groups, children, families, and adults. Our interpretive center features interactive exhibits, saltwater aquariums, and ...

Ecology monitors multiple cleanup sites at Joint Base Lewis-McChord (JBLM). This page focuses on per- and polyfluoroalkyl substances (PFAS) contamination in the groundwater. JBLM is in Pierce County, ...

We prevent and clean up toxic leaks and spills across the state. We respond to spills, inspect chemical storage and transport facilities, and clean up complex contaminated sites that threaten the ...

Advice for selecting a dam safety engineering consultant: General advice about selecting an engineering consultant for your dam — tips for how to find and interview prospective engineering consultants ...

Our agency is dedicated to preserving and protecting the environment in Washington. To learn how we preserve and protect Washington's land, air, and water for today and for future generations, read ...

We work to safely manage solid, hazardous, and nuclear waste and reduce toxic chemicals in the products you use. We regulate the threats found in everyday household products and help businesses ...