EPA Warns Farmworkers About Risks of Dacthal

Last Updated: April 4, 2024

On April 1st, 2024, the U.S. Environmental Protection Agency (EPA) announced that the herbicide tetrachloroterephthalate (DCPA), commonly known as Dacthal, may pose a risk to people who apply the pesticide or enter treated fields. This was determined during a registration review, which is done every 15 years to ensure the safety of registered pesticides. DCPA is an herbicide widely used to control weeds, particularly in agricultural settings where crops like broccoli, Brussel sprouts, cabbage, and onions are grown. 

The agency estimated that pregnant individuals working with DCPA products could be exposed to levels of the herbicide that are 4 to 20 times higher than what is considered safe, even if proper personal protective equipment and engineering controls are used. Additionally, the current label restricts entry into treated areas for 12 hours, but these areas may remain unsafe for 25 days or longer. The babies of people exposed to Dacthal during pregnancy could be at risk for low birth weight, impaired brain development, decreased IQ, and impaired motor skills. 

The EPA is issuing a warning to farmworkers based on these findings, and is in the process of determining if use of this pesticide needs to be suspended or cancelled.