tris(1,3-dichloro-2-propyl) phosphate (TDCPP) Listed Effective October 28, 2011 as Known to the State to Cause Cancer

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Effective October 28, 2011, the Office of Environmental Health Hazard Assessment (OEHHA) is adding tris(1,3-dichloro-2-propyl) phosphate (TDCPP) (CAS No. 13674-87-8) 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 65)1.

Tris(1,3-dichloro-2-propyl) phosphate (TDCPP) was considered by the Carcinogen Identification Committee (CIC) in its official capacity as the “state’s qualified experts” at a public meeting held on October 12, 2011.  The CIC determined that tris(1,3-dichloro-2-propyl) phosphate (TDCPP) was clearly shown, through scientifically valid testing according to generally accepted principles, to cause cancer.  Regulations governing the criteria 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 is published in this issue of the California Regulatory Notice Register.

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



Toxicological Endpoint

Listing Mechanism2

Tris(1,3-dichloro-2-propyl) phosphate (TDCPP)

Footnotes and References

1Health and Safety Code, section 25249.5 et seq.

2Listing mechanism: SQE – "state's qualified experts" mechanism (Title 27 Cal. Code of Regs., section 25305(a)(1)).