ATSDR - Toxic Substances - Chlorpyrifos
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Chlorpyrifos

CAS ID #: 2921-88-2

Affected Organ Systems: Neurological (Nervous System)

Cancer Classification: EPA: Not evaluated. IARC: Not evaluated. NTP: Not evaluated

Please contact NTP, IARC, or EPA’s IRIS Hotline with questions on cancer and cancer classification.

Chemical Classification: Organophosphates and carbamates

Summary: Chlorpyrifos is an insecticide that is a white crystal-like solid with a strong odor. It does not mix well with water, so it is usually mixed with oily liquids before it is applied to crops or animals. It may also be applied to crops in a capsule form. Chlorpyrifos has been widely used in homes and on farms. In the home, it is used to control cockroaches, fleas, and termites; it is also used in some pet flea and tick collars. On the farm, it is used to control ticks on cattle and as a spray to control crop pests.

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