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 visit our Proposition 65 Warnings website

About Proposition 65

The Safe Drinking Water and Toxic Enforcement Act

The Proposition 65 List

The current Proposition 65 list is dated December 29, 2023

Meetings, Hearings and Workshops

Upcoming and past meetings, hearings and workshops

Notices

All Proposition 65 Notices

Laws and Regulations

Links and downloads related to Proposition 65 statute and regulations

Warnings

Visit this website to learn about warnings for exposures to chemicals on the Proposition 65 List

How chemicals are added to the Proposition 65 list

Learn how chemicals are added to the list

Safe Use Determinations

A Safe Use Determination (SUD) is a written statement issued by OEHHA, which interprets and applies Proposition 65 and its implementing regulations to a specific set of facts in response to a request by a business or a trade group

Interpretive Guidelines for Proposition 65

An Interpretive Guideline interprets Proposition 65 and its implementing regulations, as applied to specific facts

Information Letters

Letters about Proposition 65's application from OEHHA to interested parties.

Warning Regulations

Clear and reasonable warnings

Searchable Proposition 65 Chemical Database

Search the Proposition 65 Chemical Database

Safe harbor levels

Proposition 65 No Significant Risk Levels (NSRLs) and Maximum Allowable Dose Levels (MADLs)

Reports, Notices, Documents

Sep 25, 1997: Request for Information, Availability of Draft Data Summaries and Draft Priorities for Chemicals with Respect to Their Potential to Cause Cancer
Request for information and notice of availability of draft data summaries and draft priorities for chemicals with respect to their potential to cause cancer: acronycine, 2-aminofluorene, 2-amino-5-(5-nitro-2-furyl)-1,3,4-oxadiazole, 4-amino-2-nitrophenol, N-butyl-N-nitrosourea, bis(2-chloro-1-methylethyl)ether, 2,5-dimethoxy-4’-aminostilbene, estragole, N-ethyl-N-formylhydrazine, furfural, p-chloronitrobenzene, trichloroacetic acid, 2-biphenylamine (and strong acid salts), bromoethane, chlorthal-dimethyl, cyanazine, 2,4-dichlorophenoxyacetic acid and its salts and esters, dapsone, dimethyl hydrogen phosphite, malonaldehyde and its salts, b-thioguanine deoxyriboside, zearalenone, bis(tri-n-butyltin)oxide, dicofol, di(2-ethylhexyl)adipate, patulin pentachloronitrobenzene, piperonyl sulfoxide. [Postponed: salicylazosulfapyridine, C.I. solvent yellow 14 (Sudan 1)]
Sep 12, 1997: Availability of Final Data Summaries and Priorities for Chemicals with Respect to Their Potential to Cause Birth Defects or Other Reproductive Harm
Notice of availability of final data summaries and priorities for chemicals with respect to their potential to cause birth defects or other reproductive harm via authoritative bodies and State's Qualified Experts mechanisms: Aldrin, 1,3-butadiene, Carbon tetrachloride, Chlordane, Ethylene dibromide, Formaldehyde, Heptachlor, Methylene chloride, 2,4,5-T butyl ester, Trichloroethylene, Vinyl chloride, Acrylamide, DDT, Carbamazepine, Progesterone
Sep 12, 1997: Availability of the Draft Data Summaries and Draft Priorities for Chemicals with Respect to Their Potential to Cause Birth Defects or Other Reproductive Harm
Notice of availability of the draft data summaries and draft priorities for chemicals with respect to their potential to cause birth defects or other reproductive harm. Request for information on: Chloroform, Manganese, Phenol, Progesterone, Carbamazepine, n-Hexane, Styrene, Xylenes, 1,1-Dichloroethylene, Folpet, Chromium (includes tri and hexavalent forms), Copper sulfate, Formamide, Methyl butyl ketone, Toxaphene, 1,2-Dichloropropane, Beryllium, Toluene-2,4-diisocyanate, Boric acid, Sodium tetraborate, Benzo-a-pyrene, Dichlorophenoxyacetic acid, 2,4 butyl ester, Endrin, Carbon dioxide (by inhalation)

Pages