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Chemicals Listed Effective July 24, 2012 as Known to the State of California to Cause Cancer: Isopyrazam and 3,3',4,4'-Tetrachloroazobenzene

Effective July 24, 2012, the Office of Environmental Health Hazard Assessment (OEHHA) is adding two chemicals, isopyrazam (CAS No. 881685-58-1) and 3,3’,4,4’‑tetrachloroazobenzene (CAS No. 14047-09-7), 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 (commonly known as Proposition 651).

The criteria used by OEHHA for the listing of chemicals under the “authoritative bodies” mechanism can be found in Title 27, Cal. Code of Regs., section 25306.  The listing of isopyrazam is based on formal identification by an authoritative body2, the U. S. Environmental Protection Agency, that the chemical causes cancer.  The listing of 3,3’,4,4’-tetrachloroazobenzene is based on formal identification by an authoritative body, the National Toxicology Program, that the chemical causes cancer. 

The documentation supporting OEHHA’s determination that the criteria for administrative listing have been satisfied for the chemicals isopyrazam and 3,3’4,4’‑tetrachloroazobenzene is included in the Notice of Intent to List these chemicals  published in the May 25, 2012 issue of the California Regulatory Notice Register (Register 2012, No. 21‑Z). 

A complete, updated chemical list is published in this issue of the California Regulatory Notice Register and is available on the OEHHA website at www.oehha.ca.gov.

In summary, isopyrazam and 3,3’,4,4’-tetrachloroazobenzene  are being listed under Proposition 65 as known to the State to cause cancer.

Footnotes and References

1Health and Safety Code section 25249.5 et seq.

2See Health and Safety Code, section 25249.8(b) and Title 27, Cal. Code of Regs., section 25306.