The 2023-2025 biennium outcomes report is now available as an interactive story map, highlighting water quality improvements ...

We’ve launched a study to determine the impacts of battery energy storage systems in which we’ll consider the best available ...

The Water Supply Availability Committee is a group of experts from various state and federal agencies who meet monthly to discuss conditions affecting Washington’s water supply. According to these ...

Find an E-Cycle location by entering your address, city, or zip code. E-Cycle Washington is a free program that makes it easy for Washington residents to recycle certain broken, obsolete, or worn-out ...

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, & ...

Oct. 22, 2026, 5 p.m. Online – Register for the webinar. Oct. 28, 2026, 5 p.m. Yakima Valley College, Building 38, Kaminski Conference Center directions 1704 West Nob Hill Blvd., Yakima, WA 98902 ...

Businesses in Washington must follow the the Dangerous Waste Regulations (Chapter 173-303) to ensure they properly handle and dispose of dangerous waste. For most businesses, the process will involve ...

Drayton Harbor and the streams that flow into it have high levels of fecal bacteria. The harbor and several streams in the watershed are on Washington’s impaired waters list, called the 303(d) list.

State Route 112 faces numerous climate-related threats. Photo courtesy Washington State Department of Transportation. Washington’s coastlines might be considered the canary in the coal mine for the ...

Ecology is starting rulemaking for a new rule, chapter 173-950 WAC. This rule will guide implementation of the Recycling Reform Act, a law that creates an extended producer responsibility (EPR) ...

This Earth Day, we are hosting a coloring book design contest for kids across Washington. Students will learn about how to help prevent pollution and design coloring book pages with this in mind. This ...

We adopted changes to chapter 173-201A Water Quality Standards for Surface Waters of the State of Washington. In response to nominations we received in 2021, and after considering public comments and ...