The Total Maximum Daily Load (TMDL) — or water quality improvement project — process is a science-based approach to cleaning up polluted water so that it meets state water quality standards. A TMDL is ...

We issue air quality permits to data centers to limit air pollution that comes from diesel-powered backup generators. We also keep track of the combined impacts from the diesel exhaust that may come ...

Toxic algae blooms can make people, pets, and livestock sick. We offer a funding program to address problem blooms. The Freshwater Algae Program (FAP) has an annual funding cycle for projects to ...

Ecology has announced a rulemaking to create a new rule: Chapter 173-188 WAC, Liquid Hazardous Substance Transfers. This rulemaking will establish spill prevention requirements for over-water ...

Ecology is beginning rulemaking to amend chapter 173-175 WAC, Dam Safety. This rulemaking will consider and adjust fees collected by Ecology for dam safety operations, including examination of plans ...

Tracking the health of Puget Sound doesn’t stop when we get to the bottom of the sea. The sediments below the water and the critters that live in it, known as benthic organisms, are critical ...

This vehicle is one of several which will be fitted with air monitoring equipment and Ecology branding. (Image credit: Spheros Environmental. Final branding design may differ.) The air you breathe ...

The Washington State Department of Ecology has issued a penalty of $279,000 to the owner of the Nautilus, a 38-foot personal craft, for pumping 123 gallons of red-dye diesel into the Bremerton Marina ...

Use this portal to filter and search for all of our regulatory information. We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & ...

We protect the air by implementing Zero Emission Vehicle standards, Clean Car Law, reducing diesel exhaust, and managing the Volkswagen enforcement actions that resulted from federal and state Clean ...

We offer post-cleanup grants to local governments that independently clean up contamination under the Voluntary Cleanup Program. The purpose of Independent Remedial Action Grants (IRAGs) is to ...

How Washington invests cap-and-invest auction revenues to prepare for climate change will be captured in public reporting that the Department of Ecology is responsible for publishing under the Climate ...