Petition to Revoke All Tolerances and Cancel All Registrations for the Pesticide Chlorpyrifos - Filed 12 September 2007 (PDF) July 22, 2010 Legal filings The Natural Resources Defense Council (NRDC) and Pesticide Action Network North America (PANNA) petition the U.S. Environmental Protection Agency (EPA) to revoke all tolerances and cancel all registrations for the pesticide chlorpyrifos.