The Office of Environmental Health Hazard Assessment (OEHHA) within the California Environmental Protection Agency is adding S,S,S-tributyl phosphorotrithioate (Tribufos, DEF) (CAS No. 78-48-8) 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 ).  The listing of S,S,S-tributyl phosphorotrithioate (Tribufos, DEF) is effective February 25, 2011.

S,S,S-Tributyl phosphorotrithioate (Tribufos, DEF) (CAS No. 78-48-8) is being listed as a chemical known to the State of California to cause cancer.  The listing of S,S,S-tributyl phosphorotrithioate is based on formal identification by an authoritative body , the U.S. Environmental Protection Agency (U.S. EPA), that the chemical causes cancer.

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