Study reinforces safety case for recycled tire use in sports fields

A California state study that found recycled tire crumb rubber used in synthetic turf fields is not likely to pose health risks to athletes, coaches, referees or spectators, a decision that is being welcomed by the Tire Industry Association.

The landmark study, released by the California Office of Environmental Health Hazard Assessment, found no evidence of significant cancer or other health risks linked to crumb rubber infill based on available data, including for young athletes. OEHHA researchers examined potential exposure through skin contact, inhalation and incidental ingestion.

“This is great news and reinforces what the industry has demonstrated for years,” said Dick Gust, CEO of the Tire Industry Association. “We hope this comprehensive California study helps put lingering concerns to rest and allows more communities to benefit from this safe, sustainable use of recycled tires.”

The assessment tested 35 synthetic turf fields across California, including newer and older installations from different climate regions. Researchers evaluated more than 100 chemicals that could potentially pose health risks and analyzed playing behaviour from more than 1,000 soccer players aged seven to 71. The study also included exposure scenarios for toddlers who might crawl on turf surfaces. Researchers concluded there was no acute health risk to athletes, coaches, referees, spectators or young children.

Synthetic turf fields are designed to replicate natural grass while reducing water use and maintenance needs and providing consistent playability without rest periods. Their use has expanded widely. Many systems rely on crumb rubber infill, made from recycled tires, to keep synthetic blades upright, improve traction and provide cushioning during play.

TIA said the findings reinforce a broad body of scientific research that has consistently found crumb rubber infill poses no significant health risk. The association also highlighted the role of crumb rubber as an important end‑use market for recycled tires, supporting responsible tire recycling and keeping end‑of‑life tires out of landfills.

While the study focused on health outcomes, TIA said crumb rubber applications contribute to a circular economy by turning waste tires into durable products for community use. The association supports the development of sustainable end markets for recycled tires and encouraged policymakers, municipalities and athletic organizations to review the findings.

TIA said it hopes the study will provide reassurance as communities evaluate synthetic turf projects and the materials used in their construction.

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