EPA Proposes Rule to Limit Food Uses of Chlorpyrifos Following Legal Challenges

Chlorpyrifos: A Controversial History

Chlorpyrifos, a powerful organophosphate pesticide, has been in use since 1965 for controlling various pests in agriculture. Its widespread use, however, has raised concerns due to its potential neurodevelopmental effects on children and other vulnerable populations. Legal and scientific debates about its safety have been ongoing for years​​.

Recent Legal Developments

In August 2021, the EPA revoked all chlorpyrifos tolerances based on health risks. However, a November 2023 decision by the US Court of Appeals for the Eighth Circuit found the EPA's rule insufficiently considered modifying rather than revoking tolerances. This reinstated tolerances for chlorpyrifos and led to the EPA's current proposed rule​​​.

The New Proposal

The new EPA proposal limits chlorpyrifos use to 11 food crops, including alfalfa, apples, citrus, and soybeans, while reducing the geographic scope of its application. This action is expected to decrease chlorpyrifos usage by 70% from historical levels. The EPA also highlighted its commitment to conducting ongoing risk assessments to refine pesticide safety standards​​.

Public and Industry Impact

Farmworker and public health advocates have applauded the restriction, emphasising the importance of protecting children from harmful exposure. However, some agricultural stakeholders argue that limited use on certain crops is essential to control pests effectively​.

Next Steps

The EPA's proposed rule will be open for a 60-day public comment period before finalisation. The agency continues its broader registration review of chlorpyrifos, with an amended interim decision anticipated by 2026​​.