Many parts of Puget Sound and the Salish Sea have oxygen levels that are below the levels needed for marine life to thrive. In some parts of Puget Sound, low levels of oxygen persist for most of the ...

The Chehalis Basin is a 2,700 square-mile river drainage system located in Southwest Washington along the Chehalis River and its tributaries. It is the second-largest river basin in Washington, ...

You can use an address to look up your watershed, also known as a Water Resource Inventory Area (WRIA). We typically study and regulate water resources by WRIAs. There are 62 WRIAs in Washington.

Accessibility & equity. We are committed to providing equal opportunities, resources, and access to all Washingtonians, regardless of abilities or circumstances.

Seawater chemistry is changing with rise in CO 2. Ocean acidification is the scientific term used to describe how seawater chemistry is changing due to increased amounts of carbon dioxide (CO 2) in ...

EIM Data Analysis Tool (EDAT) is an analysis tool for Model Toxics Control Act (MTCA) practitioners and other contamination cleanup professionals. It compares Washington State environmental monitoring ...

Cleanup Levels and Risk Calculation (CLARC) is a compendium of technical information related to calculating cleanup levels under Washington's Cleanup Rule, the Model Toxics Control Act (MTCA) ...