ATSDR - Toxic Substances - 2,4-Dichlorophenoxyacetic Acid (2,4-D)
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2,4-Dichlorophenoxyacetic Acid (2,4-D)

CAS ID #: 94-75-7

Affected Organ Systems: Developmental (effects while organs are developing)

Cancer Classification: EPA: Not classifiable as to human carcinogenicity. IARC: Possibly carcinogenic to humans. NTP: Not evaluated

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

Chemical Classification: Pesticides (chemicals used for killing pests, such as rodents, insects, or plants)

Summary: 2,4-Dichlorophenoxyacetic acid (2,4-D) does not occur naturally in the environment. 2,4-D is the active ingredient in many products used in the United States and throughout the world as an herbicide to kill weeds on land and in the water. There are nine forms of 2,4-D that can be used as an herbicide and it is typically sold as a powder or in a liquid form.

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