CA AB234

Enacts the Synthetic Polymer Microparticles in Cosmetic and Cleaning Products Prevention Act, prohibiting synthetic polymer microparticles from being placed on the market in California in concentrations of 0.01% by weight or greater.

Establishes staggered implementation dates: January 1, 2028 for rinse-off products (except those used as abrasives); January 1, 2029 for detergents, waxes, and polishes; January 1, 2030 for fragrance encapsulation and leave-on products; and January 1, 2036 for lip products, nail products, and makeup.

Exempts synthetic polymer microparticles that are contained by technical means, permanently modified during use, or permanently incorporated into a solid matrix, as well as prescription drugs, veterinary drugs, fertilizers, food, and industrial uses.

Specifies screening tests and pass criteria for determining compliance with the prohibition, including biodegradability tests, solubility tests, and test methodologies aligned with European Union standards.

Establishes civil penalties up to $5,000 per day for violations, enforceable by city attorneys, district attorneys, county counsel, or the Attorney General, with consideration of factors such as good faith compliance efforts and deterrent effect.