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[Portal ID #2001]

Evaluating 6PPD in the Environment

Summary of the project

The goal of this study is to evaluate environmental assessment strategies for the tire contaminant, 6PPD-quinone (6PPD-q) to support ongoing urban watershed and salmon recovery planning. Understanding the occurrence and persistence of 6PPD-q to salmon bearing streams will help prioritize urban watershed remediation projects. Remediation projects that require baseline data include stormwater retrofits, fish barrier removals, floodplain projects, sustainable urban and transportation planning, and conservation efforts.

The proposed 6PPD-q environmental assessment strategies incorporate three main approaches:

  1. Opportunistic studies to understand the spatial occurrence and persistence of 6PPD-q with variable watershed characteristics.
  2. Salmon in urban watersheds bioassay studies to develop and re-evaluate methods for measuring the health of salmon-bearing streams.
  3. Focused studies to address the many data gaps around how and where to measure 6PPD-q in the environment (method development).


6PPD Legislative Report 2022

A 6PPD spatial technical advisory committee shared research updates and priority data gaps to help develop strategies to guide our understanding of the scope and scale of the newly identified 6PPD-quinone in the environment. The committee is a multi-disciplinary team that includes natural resource scientists and managers from tribal, federal and state agencies, non-profits, consultants and PSEMP working groups. A summary of recommendations and current knowledge is now available in a 6PPD Legislative Report. This process of evaluating the current knowledge regarding the impact of tire contaminants on aquatic life helped galnanize a pro-active state, tribal and federal working groups to address the 6PPD problem and secured short-term funding for further investigations. Please find the presentation and meeting materials below. 

6PPD Spatial Technical Advisory Committee Meeting Materials

May 18, 2022



Rhea Smith
Environmental Assessment Program (EAP), WA Ecology
Nat Scholz
NOAA fisheries
Jamie Glasgow
Wild Fish Conservancy
WDFW's High Resolution Land Cover program and alternatives
Ken Pierce
Washington State Department of Fish and Wildlife (WDFW)
Craig Manahan
Hazardous Waste and Toxic Reduction, WA Ecology
Evaluating 6PPD BMPs
Brandi Lubliner
Water Quality Program, WA EcologyMeeting notes 

 May 10, 2022



Mapping and Data visualizations update
Rhea Smith
EAP, WA Ecology 

 March 30, 2022



Dr. Thorsten Reemsta
Centre for Environmental Research, UFZ, Germany
Dr. Markus Hecker
University of Saskatchewan, Canada
Chad Larson
Washington State Department of Ecology
Christy Rains
Washington Department of Fish and Wildlife
Braeden Van Deynze, University of Washington School of Marine and Environmental Affairs
Bob McKane and Jonathan Halama, EPA Region 10

 March 7, 2022



Rhea Smith, WA Ecology
Salmon Recovery and Toxic Road Runoff
David Troutt, Nisqually Indian Tribe
Statewide Intergrated Fish Distribution (SWIFD) and Salmonscape Web Maps
Ron McFarlane (NWIFC) & Arlene Agune (WDFW) & Tyson Waldo (NWIFC)
Tim Beechie, NOAA fisheries
Jennifer Vanderhoof, King County

February 23, 2022



Rhea Smith, EAP, WA Ecology
Ailene Ettinger, Washington Nature Conservancy
Christian Nilsen, Geosyntec & Washington Nature Conservancy
Watershed Characterization Project
Colin Hume, Department of Ecology, National Estuary Program
Road Runoff Reduction Plans & GIS Road Metrics
Tony Bush and Keisha Chinn, Washington Department of Transportation 

Additional 6PPD Resources 2022

 Salish Sea Ecosystem Conference - April 26-28, 2022

Ed Kolodziej, University of Washington Tacoma 
Jen McIntyre, Washington State University - Puyallup
Craig Manahan, WA Ecology 
Brandi Lubliner, WA Ecology

Technical Advisory Committee Member SSEC presentations

6PPD and 6PPD-quinone in road runoff (Amanda Johnson).
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