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The Trump EPA under Secretary Price overturned the Obama era ban on Chlorpyrifos. What is Chlorpyrifos? PAN Pesticides Database: Toxicity, Chemicals of Concern

Pesticide Action Network (PAN) Bad Actor PesticidesIn order to identify a “most toxic” set of pesticides, Pesticide Action Network (PAN) and Californians for Pesticide Reform (CPR) created the term PAN Bad Actor pesticides. These pesticides are at least one of the following:

  • Known or probable carcinogens, as designated by the International Agency for Research on Cancer (IARC), U.S. EPA, U.S. National Toxicology Program, and the state of California’s Proposition 65 list.
  • Reproductive or developmental toxicants, as designated by the state of California’s Proposition 65 list.
  • Neurotoxic cholinesterase inhibitors, as designated by California Department of Pesticide Regulation, the Materials Safety Data Sheet for the particular chemical, or PAN staff evaluation of chemical structure (for organophosphorus compounds).
  • Known groundwater contaminants, as designated by the state of California (for actively registered pesticides) or from historic groundwater monitoring records (for banned pesticides).
  • Pesticides with high acute toxicity, as designated by the World Health Organization (WHO), the U.S. EPA, or the U.S. National Toxicology Program.

In 2000, PAN and CPR published Hooked on Poison: Pesticide Use in California 1991-1998, a report on trends in pesticide use in California with a particular focus on Bad Actor pesticides used in California.

About the Data: Accuracy, currency, comprehensiveness and source

Data for PAN Bad Actors come from official lists of chemicals with certain toxicity properties. The available lists are generally accurate and up-to-date. However, because many chemicals have not yet been thoroughly evaluated, these lists cannot be considered comprehensive. New chemicals will be added as they are listed in the official source lists.


See individual toxicant categories (acute toxins, carcinogens, etc.) for data sources.

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