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.

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

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 ...

The Rayonier Mill property covers about 70 acres of land on the shore of the Strait of Juan de Fuca. Ennis Creek runs from the foothills of the Olympic Mountains, through the site, and into Port ...

First, you’ll need to create a Secure Access Washington (SAW) account, unless you already have one). Go to https://secureaccess.wa.gov. Create a Secure Access Washington (SAW) account, or login in if ...

We propose updates to the human health criteria in Table 240 of WAC 173-201A-240, Toxic substances, to: Replace 143 state-adopted human health criteria for 73 pollutants that the Environmental ...

This plan was adopted by the Washington State Department of Ecology following the Open Data Policy established by the Office of the Chief Information Officer (OCIO). Measure: Number of times ...

The list of rules below are categorized by topical areas. These links will take you to the existing rule language on the Washington State Legislature's Code Reviser's web page. The Office of the Code ...

We maintain a network of stream-gaging stations that report streamflow conditions in rivers and streams across the state. The information is used to monitor flow conditions for water supplies for ...

The email address for contacting Ecology’s Hydrofluorocarbons Team about variance and exemption requests provided in Chapter 173-443 WAC is incorrect. While corrections are made, please email ...

We offer some flexible options to submit data, apply for permits, or file reports. For instance, contractors can apply online for a construction stormwater permit, or a plant operator can file ...

The Washington State Department of Ecology (Ecology) started a rulemaking to revise the Safer Products Restrictions and Reporting rule—Chapter 173-337 WAC, aiming to reduce PFAS in consumer products.