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Tetrachlorvinphos Listed Under Proposition 65 (June 2016)

The California Office of Environmental Health Hazard Assessment (OEHHA) added Tetrachlorvinphos (TCVP) to the list of chemicals under Proposition 65 known to the state to cause cancer under the Labor Code listing mechanism. The compound is an organophosphate insecticide that is often used in flea and tick collars, as well as powders and sprays for pets. It is also used for insect control in kennels and as a perimeter treatment for livestock and their living spaces.

In 2015 the International Agency for Research on Cancer (IARC) determined that TCVP in experimental animals produced sufficient evidence of carcinogenicity for the chemical to be type casted in Group 2B (“possibly carcinogenic to humans”) of its list of classified agents. The IARC has published this list titled "Agents classified by the IARC Monographs, Volume 1-112” (IARC, 2015a) on its website.


Chemical CAS No. Toxicological Endpoints Listing Mechanism*
Tetrachlorvinphos 22248-79-9 Cancer Labor Code (LC)

















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