OEHHA (Office of Environmental Health Hazard Assessment)

The Office of Environmental Health Hazard Assessment (OEHHA) is the primary California state agency responsible for implementing Proposition 65 (the Safe Drinking Water and Toxic Enforcement Act of 1986). OEHHA’s Proposition 65 responsibilities include: maintaining and updating the list of chemicals known to cause cancer or reproductive harm (900+ chemicals as of April 2026); establishing safe harbour levels (NSRLs and MADLs); developing and amending warning regulations (Title 27 CCR); issuing interpretive guidelines and Safe Use Determinations; supporting the Scientific Advisory Panel (including CIC and DARTIC); and receiving 75% of all civil penalties from Proposition 65 enforcement actions.

California Health & Safety Code §25249.1 (OEHHA’s role); Title 27 CCR (OEHHA Proposition 65 regulations); OEHHA at oehha.ca.gov.

OEHHA is the primary regulatory authority for Proposition 65 compliance. Businesses should regularly check the OEHHA website for: new chemical listings and proposed listings; updated safe harbour levels (NSRLs and MADLs); new or amended warning regulations; Safe Use Determinations and Interpretive Guidelines; and fact sheets on specific chemicals and industries. OEHHA’s P65Warnings.ca.gov website provides consumer-facing information and must be referenced in safe harbour warnings. Subscribing to OEHHA’s email updates is a practical compliance monitoring tool.