Environmental Protection Agency is announcing the cancellation of all products containing the pesticide dimethyl tetrachloroterephthalate (DCPA or Dacthal) under the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA). In making this decision, EPA relied on the best available science, which included robust studies demonstrating thyroid toxicity. Unborn babies whose pregnant mothers are exposed to DCPA from handling, entering or working in areas where DCPA has already been applied, could experience changes to fetal thyroid hormone levels. These changes are generally linked to low birth weight, impaired brain development, decreased IQ, and impaired motor skills later in life, some of which may be irreversible. The final cancellation prohibits anyone from distributing, selling or carrying out other similar activities for the remaining pesticide products containing DCPA. It also means that no person can continue using existing stocks of those products. AMVAC has developed a voluntary return program for existing DCPA products. In advance of the cancellation order, AMVAC implemented a plan to identify existing stocks and coordinated a collection process. When the return program concludes in the fall of 2024, EPA will continue monitoring this process to ensure that the collected DCPA products are disposed in a manner in accordance with applicable laws. EPA plans to release additional information about any remaining stocks in the coming months.