Proficiency testing sample providers must comply with the most current proficiency standards to be recognized by our laboratory accreditation program. Six providers of Proficiency Testing (PT) samples ...

We also provide educational resources to property owners who want to drill a new well, maintain a well, or close down (decommission) an unused well. Well drillers and property owners have the ...

In 2008, Washington's Legislature passed the Children's Safe Products Act (or CSPA) (Chapter 70A.430 RCW). This law applies to children’s products sold in Washington state. Washington’s laws apply to ...

Waste tires are those no longer suitable for their intended purpose due to wear or damage. Accumulations of waste tires harbor mosquitos, snakes, and other vermin, which pose health risks, such as the ...

Ecology, local clean air agencies, and Tribes can restrict indoor and outdoor burning under certain conditions. Air quality burn bans protect people when the air is unhealthy. Fire safety burn bans ...

Washington's recycled content law (Chapter 70A.245 RCW) sets minimum post-consumer recycled content (PCRC) standards for specific products. This page explains which products are subject to the law and ...

We accredit Washington environmental laboratories — including those that analyze drinking water, wastewater, soil, sediments, and solid waste — for Washington state. Accredited laboratories provide ...

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 ...

Spend time in Washington, and you're likely to encounter one of the many cascading rivers, salmon-filled streams, or picturesque lakes in abundance. From the Puget Sound lowlands to the high desert, ...

We maintain the spatial datasets described here in order to better describe Washington's diverse natural and cultural environments. As a public service, we have made some of our data available for ...

Casey Sixkiller was appointed by Governor Bob Ferguson as the 14th Director of the Washington State Department of Ecology. With more than two decades of experience in federal, Tribal, regional, and ...

Lea la historia de Hanford en español aquí. The past, present, and future of the Hanford Site is long and complex, dating back well before the site's construction in the 1940s and long into the future ...