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EPA releases final health assessment for tetrachloroethylene (perc).

The EPA recently posted the final health assessment for tetrachloroethylene--also known as perchloroethylene, or perc--to EPA's Integrated Risk Information System (IRIS) database. Perc is a chemical solvent widely used in the dry cleaning industry. It is also used in the cleaning of metal machinery and to manufacture some consumer products and other chemicals. Confirming longstanding scientific understanding and research, the final assessment characterizes perc as a "likely human carcinogen." The assessment provides estimates for both cancer and non-cancer effects associated with exposure to perc over a lifetime.

EPA does not believe that wearing clothes dry cleaned with perc will result in exposures which pose a risk of concern. EPA has already taken several significant actions to reduce exposure to perc. EPA has clean air standards for dry cleaners that use perc, including requirements that will phase-out the use of perc by dry cleaners in residential buildings by December 21, 2020. EPA also set limits for the amount of perc allowed in drinking water and levels for cleaning up perc at Superfund sites throughout the country, which will be updated in light of the IRIS assessment.

The toxicity values reported in the perc IRIS assessment will be considered in:

* Establishing cleanup levels at the hundreds of Superfund sites where perc is a contaminant

* Revising EPA's Maximum Contaminant Level for perc as part of the carcinogenic volatile organic compounds group in drinking water, as described in the agency's drinking water strategy

* Evaluating whether to propose additional limits on the emissions of perc into the atmosphere, since perc is considered a hazardous air pollutant under the Clean Air Act

The assessment replaces the 1988 IRIS assessment for perc and for the first time includes a hazard characterization for cancer effects. This assessment has undergone several levels of rigorous, independent peer review including: agency review, interagency review, public comment, and external peer review by the National Research Council. All major review comments have been addressed.

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Publication:Hazardous Waste Superfund Alert
Date:Feb 28, 2012
Words:321
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