Also known as: 2,4-Dichlorophenoxyacetic acid, Weed-B-Gone, Acme, Aquakleen
Chemical reference number (CAS): 94-75-7

What is 2,4-D?

2,4-D is a popular weed killer used to control weeds like dandelions, clover, and thistles. In its pure form, it is a colorless crystal that dissolves easily in water. Nearly 60% of the 2,4-D sold in the United States is used on agricultural crops. The rest is used on range and pasture land, lawns and turf, forests and in surface water.

In the home it may be found in common weed-and-feed products used on lawns. 2,4-D can contaminate air during, and shortly after it's applied. It can also be carried along by rainwater. Soil may be contaminated with 2,4-D when the chemical is spilled or improperly disposed.

Can a medical test determine exposure to 2,4-D?

Testing a person's urine for "chlorophenoxyacetic acid" can confirm a recent exposure to 2,4-D, but cannot predict future symptoms. A medical evaluation after high-level exposure may include tests of liver and kidney function and tests for anemia. These tests indicate whether damage occurred, but may not be able to tell whether 2,4-D caused the damage.

Seek medical advice if you have any symptoms that you think may be related to chemical exposure.

This fact sheet summarizes information about this chemical and is not a complete listing of all possible effects. It does not refer to work exposure or emergency situations.

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Last Revised: January 2, 2018

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