Proposition 65

Proposition 65, officially known as the Safe Drinking Water and Toxic Enforcement Act of 1986, was enacted as a ballot initiative in November 1986. The proposition protects the state's drinking water sources from being contaminated with chemicals known to cause cancer, birth defects or other reproductive harm, and requires businesses to inform Californians about exposures to such chemicals.

Proposition 65 requires the state to maintain and update a list of chemicals known to the state to cause cancer or reproductive toxicity.

Questions?

Questions about Proposition 65? Check our Frequently asked Questions page or contact the Proposition 65 office: (916) 445-6900 or email P65.Questions@oehha.ca.gov.

Reports, Notices, Documents

Dec 5, 1997: Request for Information on Methyl Tertiary-Butyl Ether (MTBE)
Request for information on Methyl Tertiary-Butyl Ether (MTBE), a chemical to be considered by OEHHA’s Science Advisory Board’s Carcinogen Identification Committee and Developmental and Reproductive Toxicant (DART) Identification Committee.
Oct 31, 1997: Correction to the List of Chemicals Known to the State to Cause Cancer or Reproductive Toxicity: Di-n-propyl isocinchomeronate, (MGK Repellent 326), MeIQ(2-Amino-3,4-dimethylimidazo, [4,5-f]quinoline), and Polybrominated biphenyls
Correction to the List of Chemicals Known to the State to Cause Cancer or Reproductive Toxicity: correction of CAS numbers for Di-n-propyl isocinchomeronate, (MGK Repellent 326), MeIQ(2-Amino-3,4-dimethylimidazo, [4,5-f]quinoline), and Polybrominated biphenyls
Oct 24, 1997: Chemicals Listed Effective October 24, 1997 as Known to the State to Cause Cancer: 2,4,5-Trimethylaniline and its strong acid salts, 5-Chloro-o-toluidine and its strong acid salts, and Quinoline and its strong acid salts
Chemicals listed effective October 24, 1997 as known to the State to cause cancer or reproductive toxicity by the State's Qualified Experts: 2,4,5-trimethylaniline and its strong acid salts, 5-chloro-o-toluidine and its strong acid salts, and quinoline and its strong acid salts.

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