At Ecology, every day is Earth Day. Our mission is to protect, preserve, and enhance the environment for today and for future generations. Our staff work across the state to accomplish this mission, ...

The Action Agenda for Puget Sound sets cleanup priorities for contaminated sites at priority bays and any location within a half mile of Puget Sound. We're overseeing — and, in many cases, helping to ...

Our work statewide & near you Information for residents of Washington, to help you better understand the work Ecology does, find what's happening near you, and see what you can to do to help protect ...

We help lakeshore property owners, communities, counties, state agencies, and Tribes identify and control invasive freshwater aquatic plants. Aquatic invasive plants are not native to Washington’s ...

El Departamento de Ecología está proponiendo enmiendas al Capítulo 173-201A WAC, Normas de calidad del agua para aguas superficiales del estado de Washington (en inglés, Water Quality Standards for ...

This plan was adopted by the Washington State Department of Ecology following the Open Data Policy established by the Office of the Chief Information Officer (OCIO).

Mercury is found in a wide variety of products. If your business works with mercury-containing products, they must be handled properly as dangerous waste to protect your workers and the environment.

The Water Quality Assessment has millions of data points on rivers, streams, lakes, and marine waters across Washington state. You can tell a lot about a stream by looking at its bugs. When you see a ...

We educate the public and professionals about important shoreline issues. Along Washington's coastlines, this includes information about landslides, which are common along steep bluffs in Puget Sound ...

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, & ...

Certain types of food packaging that have per- and polyfluoroalkyl substances (PFAS) intentionally added to them may not be manufactured, sold, or distributed in Washington as of 2023 according to a ...