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

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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)




Footnotes and References

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)).