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Fenamiphos Facts

EPA 738-F-08-005
June 2008

EPA assessed the risks of fenamiphos and completed an Interim Reregistration Eligibility Decision (IRED) document for this organophosphate (OP) pesticide in 2002. The IRED identified risk mitigation measures needed to reduce risk, as well as data needed to better characterize risks. The sole registrant, Bayer Corporation, requested voluntary cancellation and phase-out of all existing fenamiphos registrations rather than committing to develop additional data.  EPA approved this request.

Used on a variety of vegetables and fruits, fenamiphos residues in food do not pose risk concerns.  However, exposure to drinking water sources from shallow water tables (less than 50 feet deep) and extremely vulnerable soils do pose risk concerns.  Extremely vulnerable soils are defined as, "hydrologic soil group A soils that are excessively drained and predominantly sand or loamy sand, such as soils in the suborder psamments."  These classifications and soil taxonomy refer to USDA definitions.  Therefore, all uses of fenamiphos in areas with extremely vulnerable soils and shallow water tables were phased out by May 31, 2005.

Fenamiphos is not used in residential settings. It is, however, used on turf including golf course turf, which could lead to golfer exposure from residues on treated courses. Nevertheless, the Agency believes that the watering-in of fenamiphos adequately protects golfers.Implementation of risk mitigation during the phase out, negotiated between the registrant and the Agency, is believed to decrease the risks associated with fenamiphos.

EPA has considered available information on the cumulative risk of the OP pesticides, which share a common mechanism of toxicity, as required by the Food Quality Protection Act (FQPA).  The tolerance reassessment decision for fenamiphos has been proposed in a Federal Register notice dated February 6, 2008 (FRL-8345-2).  This notice proposes that all domestic tolerances are to be revoked by December 31, 2009.  The notice also proposes that several commodities treated with fenamiphos will continue to have import tolerances:  banana; fruit, citrus, group 10; garlic; grape; and pineapple.

The fenamiphos decision was made through the OP pilot public participation process, which increases transparency and maximizes stakeholder involvement in EPA's development of risk assessments and risk management decisions. EPA worked extensively with affected parties to reach the decisions presented in the IRED document. The agreement on the voluntary cancellation, based on the registrant's decision not to develop data that were an essential part of the risk mitigation proposal, concludes the Agency’s reregistration review of fenamiphos.


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Risk Mitigation

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