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West Troy Contaminated Aquifer

Site Information

City of Troy, Ohio

Site Information

Community Involvement Coordinator
Virginia Narsete
312-886-4359 or 800-621-8431, ext. 64359

Remedial Project Manager
Shari Kolak (kolak.shari@epa.gov)
312-886-6151 or 800-621-8431, ext. 66151


The West Troy Contaminated Aquifer is in a wellfield in the City of Troy, Ohio. The municipal system supplies water to about 28,000 people. Since 1986 volatile organic compounds , primarily tetrachloroethene (also referred to as PCE), have been detected in one of the five production wells in the West Well Field. The Ohio EPA conducted several investigations beginning in the early 1990s; however, a definitive source of VOC contamination in the West Well Field has not been identified. A separate ground plume has led to VOC contamination in the city’s East Well Field which is part of the East Troy Contaminated Aquifer National Priorities List site.

The EPA and the Ohio EPA have conducted assessment work for the ground water plume and source areas but have not identified the source of VOC ontamination. Further investigation is needed to identify the source of VOC contamination and define the precise extent of the ground water plume.


The West Troy Contaminated Aquifer site was added to the Superfund program's NPL Sept. 14, 2012. The NPL is  EPA's list of the most serious uncontrolled or abandoned hazardous waste sites identified for long-term cleanup. EPA will try to identify any parties potentially responsible for the contamination. For sites without a viable responsible party, EPA investigates the extent of the contamination before starting any significant cleanup. When a site is added to the NPL it is eligible for financial resources to characterize the extent of the contamination and develop a cleanup plan.  

How a site is listed

EPA uses a mechanism called the Hazard Ranking System to place hazardous waste sites on the NPL.  This is a scoring tool using initial and limited investigations to assess the potential that the site poses a threat to human health and the environment. Scores are based on the potential of hazardous substances spreading from the site and other factors such as density and how close the contamination is to people.

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