Jan 30, 2026 · The Washington State Department of Ecology provides resources and information to protect and manage Washington's environment and natural resources.

We accredit environmental laboratories — including those that analyze drinking water, wastewater, surface water, groundwater, stormwater, biosolids, fish tissue, soil, sediments, and solid and …

Ecology has issued a Request for Information (RFI) to support implementation of Washington’s Recycling Reform Act. The RFI seeks technical information, datasets, and recommendations to …

Sep 5, 2025 · Ecology issued an official rebuke of a federal report being used to justify the rollback of climate regulations and released a new scientific analysis of local climate impacts.

About us Our vision: Our partnerships protect and sustain healthy land, air, water, and climate in harmony with a strong economy. Our mission: To protect, preserve, and enhance Washington’s …

Public comments are accepted over a 30-, 45-, or 60-day period. During that time, you can share your input with us about specific changes in the permits we regulate. We review all comments and then …

Jan 6, 2026 · As we enter 2026, let’s take a moment to check in on what a wild month of December weather has meant for snowpack, water supplies, and the potential for drought in the year ahead. …

Sep 10, 2025 · Ecology is working closely with toxicologists and staff at Washington Department of Fish and Wildlife to develop this approach. Phosphorus control treatments Phosphorus is a nutrient that …

Nov 20, 2025 · Ecology releases revised draft study looking at potential environmental impacts of proposed Chehalis River flood control project..

Children's product manufacturers are required to report each year if their products contain chemicals of high concern to children (CHCC list) (WAC 173-334-130). Some of these chemicals are restricted …