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Proposition 65

Chemical Listed Effective December 20, 2013 as Known to the State of California to Cause Cancer: Diisononyl Phthalate (DINP)

Effective December 20, 2013, the Office of Environmental Health Hazard Assessment (OEHHA) is adding diisononyl phthalate to the list of chemicals known to the State to cause cancer for purposes of the Safe Drinking Water and Toxic Enforcement Act of 1986 (Proposition 651).

Diisononyl phthalate was considered by the Carcinogen Identification Committee (CIC) in its official capacity as the “state’s qualified experts” (SQE) at a public meeting held on December 5, 2013.  The CIC determined that the chemical was clearly shown, through scientifically valid testing according to generally accepted principles, to cause cancer.  Regulations for listing of chemicals by the CIC are set out in Title 27, California Code of Regulations, section 25305(a)(1). 

A complete, updated chemical list available below.

In summary, the following chemical is being listed under Proposition 65 as known to the State to cause cancer:



Toxicological Endpoints

Listing Mechanism2

Diisononyl phthalate (DINP)




1 Health and Safety Code section 25249.5 et seq.

2 Listing mechanism:
SQE – “state’s qualified experts” mechanism (Health and Safety Code section 25249.8(b) and Title 27 Cal. Code of Regs., section 25305(a)(1)).

This Proposition 65 list is dated December 20, 2013

Follow this link to download the Proposition 65 list dated December 20, 2013.

If you would like to sort the list by CAS number or date, please download the list as an Excel document. You can then sort the list by date, CAS number, or chemical name using MS Excel. The Excel document also includes the listing mechanism for each chemical listing and the safe harbor level, if one has been adopted. A hyperlink is provided for those chemicals for which the basis for listing documentation is available electronically. A hyperlink is provided for those safe harbor levels for which the risk assessment documentation is available electronically.

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