Previous studies by the Tulalip Tribes, the state, and Snohomish County detected high levels of fecal bacteria in many ...

Our return-on-investment research describes tangible outcomes in terms of numbers, such as jobs created, acres redeveloped, ...

In recent history, Washington has experienced three very strong El Niño events: 2016, 1998 and 1984. All three of those years ...

WAC 173-443 restricts the use of hydrofluorocarbons and other fluorinated gases with a Global Warming Potential (GWP) of more than 150. It also prohibits the manufacture and sale of products ...

The Washington State Department of Ecology seeks public comment on its draft permit renewal that will cover 52 waste sites and facilities at the Hanford Site in southeast Washington. The Hanford ...

Spills of oil or hazardous materials to water must be reported immediately to help reduce impacts to the environment. Failure to report a spill you're responsible for could result in penalties. Stop ...

The Water Quality Combined Funding Program funds projects that improve and protect water quality throughout Washington. The program combines grants and loans from state and federal funding sources.

We are required to fund the Wastewater Operator Certification (OpCert) Program with fees (WAC 173-230-240). We review and evaluate these fees every two years, then propose changes, if needed, based on ...

National Pollutant Discharge Elimination System (NPDES) permits cover discharge to surface waterbodies like rivers, lakes, or the Puget Sound. State Waste Discharge Permits (SWD) cover discharge to ...

Explore our eight study regions to discover what we are learning about health of Washington's river and stream habitats. See text below the map for more study details. Ecological indicators provide ...

Ecology is proposing revisions to chapter 173-423 WAC, Washington’s Clean Vehicles Program rule. These revisions align with California’s changes to vehicle emissions standards that apply to new ...