Prop 65 Roundup - August 2026

Prop 65 Counsel: What To Know

OEHHA Notices

OEHHA Releases Draft Regulatory Amendments to Proposition 65 Warning Regulations

On July 22, the California Office of Environmental Health Hazard Assessment (OEHHA) released draft regulatory amendments to Proposition 65. The proposed changes address several areas of compliance, including internet and online sales warnings, use of QR codes, retailer warning obligations, short-form warning requirements, and clarification of certain exemptions. Public comments will be accepted through September 7. The proposed amendments could affect Proposition 65 warning and compliance obligations across a wide range of industries.

Welding Fumes Added to the Proposition 65 List for Cancer

Effective July 17, OEHHA added welding fumes to the Proposition 65 list of chemicals known to the State of California to cause cancer. The listing was adopted through the Labor Code listing mechanism following a public notice and comment period, during which no comments were received. As a result of the listing, businesses whose products, operations, or workplaces may expose individuals to welding fumes should evaluate potential Proposition 65 warning obligations and other compliance considerations associated with the newly listed carcinogen.

Hydrochlorothiazide, Voriconazole, and Tacrolimus Added to the Proposition 65 List for Cancer

Effective July 17, OEHHA added hydrochlorothiazide, voriconazole, and tacrolimus to the Proposition 65 list of chemicals known to the State of California to cause cancer. Hydrochlorothiazide is a diuretic used to treat high blood pressure and edema, voriconazole is an antifungal, and tacrolimus is an immunosuppressant. Because these substances are used in a variety of pharmaceutical products, businesses involved in their manufacture, distribution, or sale should evaluate potential Proposition 65 compliance obligations, including warning requirements where applicable.