An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Risk Assessment: Perchloroethylene Dry Cleaners Refined Human Health Risk Characterization

This November 2005 memo and appendices describe the methods by which EPA conducted its refined risk assessment of the Major Source and Area Source facilities within the perchloroethylene (perc) dry cleaners source category; EPA performed this assessment to inform a potential residual risk rule for these sources. The assessment evaluated chronic cancer, chronic non-cancer and acute inhalation risk for a single hazardous air pollutant (HAP), perchloroethylene (perc).

For more information on the rule, visit the regulation page for Dry Cleaning Facilities: National Perchloroethylene Air Emission Standards.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.