We're updating requirements for protecting water quality when washing and maintaining bridges and ferry terminals.

Algae blooms can appear in different colors ranging from green to red, orange, yellow or brown. Often these colors are from the pigments in different types of phytoplankton that allow them to ...

The Salish Sea Model is a powerful computer tool that simulates hydrodynamic and water quality processes to improve our understanding of how nutrients affect water quality in Puget Sound, the Strait ...

A 2016 Washington State Supreme Court decision changed how counties decide to approve or deny building permits that use wells for a water source. In the Whatcom County vs. Hirst, Futurewise, et al.

Our Industrial Section provides oversight and regulation for air, water, and waste activities for most of Washington's largest industrial facilities. These include refineries, smelters, pulp and paper ...

Due in part to the May 23, 2013, collapse of the Skagit River Bridge, the Washington State Department of Transportation (WSDOT) and local governments developed a robust schedule to inspect and repair ...

The Construction Stormwater General Permit requires that site inspections be conducted by a Certified Erosion and Sediment Control Lead (CESCL). We keep a list of CESCL inspectors and training ...

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 ...

The following templates are based on applicable SEPA rule sections and other guidance materials. Lead agencies are encouraged to modify these templates for their own use and add information for ...

Rainwater collection, including the use of rain barrels, has become more popular as a supplemental source of water. In 2009, we issued a rainwater use interpretive policy, which clarifies that you may ...

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 ...

Find a moderate risk waste disposal site in your county. Accepts: Household hazardous waste. Does not accept wastes from business unless it is a scheduled small business collection event. Check with ...