California Proposes Listing Microplastics as an SCP Candidate Chemical

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California’s Department of Toxic Substances Control (DTSC) has proposed to designate microplastics as a “candidate chemical,” a move that could lead to future regulation of products that contain or generate microplastics under the state’s Safer Consumer Products (SCP) program.

Adding microplastics to the SCP candidate chemical list would not in itself create new regulatory requirements.  However, it would allow SCP to evaluate specific types of products containing microplastics for possible designation as a “priority product,” which could ultimately result in restrictions or other regulatory measures.

“Microplastics are pervasive, persistent, and increasingly linked to potential risks to human health, wildlife and the environment,”  DTSC stated in a June 20 press release.  “They have been found in nearly every corner of the planet, including oceans, soil, indoor air, and even on the highest mountain peaks.”

The press release also highlights the “economic burden” of microplastic pollution, noting that “healthcare costs linked to plastic-associated chemicals are projected to exceed $144 billion by 2025” in California.

A technical document accompanying the proposal defines microplastics as “plastics that are less than 5 millimeters (mm) in their longest dimension, inclusive of those materials that are intentionally manufactured at those dimensions or are generated by the fragmentation of larger particles.”

The document acknowledges the “structural heterogeneity and complexity of different plastic polymers,” but argues that microplastics still constitute a “chemical” under SCP’s governing regulations.

The proposal was foreshadowed by SCP’s most recent priority products work plan, released in 2024 and discussed in a previous blog post.  For the first time, the work plan identified products containing or generating microplastics as a consumer product category warranting evaluation for priority products.

Comments on the proposal will be accepted through August 4 via CalSAFER.