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Pesticide News Story: EPA Extends Comment Period on Chlorpyrifos Preliminary Volatilization Assessment to May 7, 2013

For Release: March 7, 2013

As announced in the Federal Register on March 6, 2013, the EPA is extending for an additional 60 days the comment period on the agency’s preliminary volatilization assessment for the registration review of chlorpyrifos. The comment period will close on May 7, 2013, rather than on March 8, 2013. The agency received requests from several commenters to extend the original 30-day comment period. Comments should be submitted by May 7, 2013, to docket EPA-HQ-OPP-2008-0850 at www.regulations.gov.

Released for comment on February 6, 2013, the preliminary assessment evaluates potential risks to children and other bystanders from volatilization of chlorpyrifos from treated crops. The EPA requests comment to address uncertainties and assumptions in the preliminary volatilization assessment, which indicates that in some circumstances, bystanders may be exposed to chlorpyrifos and/or the transformation product chlorpyrifos-oxon at concentrations that could cause adverse effects. With more information, the agency’s preliminary assessment could be refined and result in lower exposure and risk estimates. The chlorpyrifos preliminary volatility assessment , guide to commenters , and related documents are available in docket EPA-HQ-OPP-2008-0850 at www.regulations.gov.

After reviewing comments received during the comment period, the EPA plans to issue a revised volatilization assessment, explain any changes to the preliminary assessment, respond to comments, and evaluate the need for risk mitigation for chlorpyrifos.  The EPA is reviewing chlorpyrifos to ensure that it continues to meet the statutory standard for registration and can be used without causing unreasonable adverse effects to human health or the environment. An organophosphate insecticide, chlorpyrifos is used to control insect pests on a variety of food crops and non-food sites.

The EPA’s preliminary volatilization assessment is also responsive to a petition filed by the Natural Resources Defense Council and the Pesticide Action Network North America, which requested that the agency revoke all tolerances and cancel all registrations for chlorpyrifos. The agency’s interim responses to the petition including a January 25, 2013, response are available in docket EPA-HQ-OPP-2007-1005  at www.regulations.gov.

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