Tire reformulation efforts gaining attention
Recent research and potential regulatory action have put vehicle tires in the crosshairs of reformulation. Gaining momentum is the call for tire manufacturers to find less toxic alternatives for their product formulation. Specifically being targeted are the removal of zinc, 6PPD-quinone, and other toxics.
One thing driving the effort is recent research out of the University of Washington (UW) showing a connection between particles worn from tires and an immediate toxic effect on local aquatic life. In this study scientists specifically link the toxic 6PPD-quinone, being called 6PPD for short, to annual die-offs of coho salmon during spawning runs up western Washington streams. 6PPD is used in tires to prevent rubber from breaking down too quickly. The UW study focused on roadways in the Seattle-Tacoma region as well as other large west coast cities, including Los Angeles and San Francisco.
Additionally, California’s Department of Toxic Substances Control (DTSC) has announced it will work through the state’s Safer Consumer Products (SCP) program to encourage tire reformulation in advance of potential regulation. At this point, DTSC is encouraging tire manufacturers to look into removing zinc from the products. Zinc is included in tires to strengthen the rubber. Unfortunately, as tires wear the zinc is released and ends up in stormwater runoff draining into waterways and harming wildlife.
Parties interested in these efforts should keep their eyes on DTSC this spring; that is when the agency plans to issue a technical review and potentially begin public comment on rulemaking. Even if these most recent efforts don’t materialize into regulation, it is clear tire makers will continue to be part of the conversation around waterway toxicity.


















































