DTSC Releases Microplastics Background Document Ahead of December Workshop

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This month, California’s Department of Toxic Substances Control (DTSC) released a public background document summarizing its research on products that contain or generate microplastics.  DTSC is requesting comment on the specific product categories evaluated in the document through January 16, 2026.  The department will also hold a virtual workshop to receive public input on December 11, 2025, at 9:30am PT.

Background

The background document and workshop are part of DTSC’s rulemaking to add microplastics to the Safer Consumer Products (SCP) program candidate chemicals list.  As discussed previously, adding microplastics to the list would not itself create new regulatory requirements, but it would allow DTSC to pursue restrictions in specific products that contain or generate microplastics in the future.

According to DTSC, the background document is part of its “external engagement process, which helps us decide whether to conduct additional research or potentially list one or more products that contain or have the potential to generate microplastics as Priority Products.”  The department also notes that, based on its evaluation, it is “concerned about the potential for adverse impacts from exposure to microplastics in consumer products frequently used by the general public, workers, and children.”

Evaluated Product Categories

DTSC outlines preliminary screening results for the following product categories:

  • Artificial turf infill
  • Children’s toys that contain primary microplastics
  • Cleaning products
    • Intentionally added polymers in laundry and dishwashing detergents
    • Polymeric fragrance microcapsules in laundry detergents and fabric softeners
    • Water-soluble polymers in laundry and dishwashing detergents pods
  • Food contact articles
    • Plastic baby feeding bottles
    • Plastic beverage bottles and caps
    • Plastic cling wraps and films
    • Plastic wrappers for snacks and candy
    • Polystyrene foam foodware
    • Single-use plastic tea bags
  • Plastic film mulch used in agriculture
  • Single-use cigarette filters made of cellulose acetate
  • Water-based interior wall paints

For each evaluated product category, DTSC describes the type of microplastics present (primary/secondary), the potential for exposure, potential alternatives, and relevant US and international regulations.  An appendix lists additional evaluated product categories that may be considered for further research.

These categories fall under DTSC’s current work plan product category of products that contain or generate microplastics, discussed in a previous post.

Requested Information

The background document identifies a number of data gaps for which DTSC seeks public input.  For example, regarding water-based interior wall paints, DTSC requests information on whether manufacturers are developing non-plastic alternatives to primary microplastics, obstacles to replacing them, whether alternatives can provide comparable performance, and which types of paint could feasibly transition away from microplastics while still meeting performance requirements.

Interested parties can submit comments trough DTSC’s CalSAFER portal.  As noted above, comments will be accepted through January 16, 2026.