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Department of Ecology
Committees, Boards, and Workgroups

Addressing 6PPD

This page is run by the Washington State Department of Ecology and serves as a resource hub for those closely following 6PPD. In addition to this page, we include links to other pages that are relevant to 6PPD below. For more general information about 6PPD, please visit our website. You can also join our email list to receive monthly updates about Ecology's 6PPD work.

What is 6PPD?

In 2020, researchers at the University of Washington-Tacoma, Washington State University, and additional collaborators identified the connection between car tires, 6PPD-quinone, and pre-spawn mortality in coho salmon. In response to this discovery, Washington State is taking action to protect humans and aquatic organisms from these chemicals, including closely monitoring ongoing research and conducting research of our own. 

Informational Resources

Past Events

6PPD Webinar: June 21, 2023 from 1 to 3 p.m. PDT

State agencies, including the Department of Ecology, Department of Fish and Wildlife, Department of Health, Department of Transportation, and Puget Sound Partnership prepared materials to share our ongoing work addressing 6PPD and 6PPD-quinone. We invited participants to review informational materials in advance of the event, then submit questions using our online comment form.

During the event, we responded to live questions and questions we received through our comment form. You can read written responses to many of these questions and access resources we shared in our 6PPD interagency webinar follow-up document. 

Webinar Follow-Up Materials

ADA Accessibility

The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188.

To request an ADA accommodation, contact Ecology by phone at 360-407-6700 or hwtrpubs@ecy.wa.gov. For Washington Relay Service or TTY call 711 or 877-833-6341. Visit Ecology’s website for more information.


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