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Skip Navigation LinksDNREC : Division of Waste & Hazardous Substances : Site Investigation & Restoration : Hockessin Groundwater Site

 Hockessin Groundwater Site


UPDATE:   The U.S. Environmental Protection Agency (EPA) added the Hockessin Groundwater Site to the National Priorities List (NPL) on May 17, 2018. The NPL is EPA’s list of sites eligible for remedial action financed under the federal Superfund program. The  listing will allow EPA to use Superfund authority and resources to work with DNREC to help resolve groundwater concerns in the Hockessin area. EPA -- with support from DNREC, the Delaware Division of Public Health (DPH) and Artesian Water Company -- held a public meeting on the proposed listing of the Hockessin Groundwater Site to the NPL in Feb. 2018 at Hockessin Memorial Hall.  EPA and DNREC's presentations, as well as links to other related documents and websites, can be found below.  Federal Register notices and EPA's supporting documents for the site are available at:

For more information regarding the EPA's Superfund Program, please contact: 

  • Alexander Mandell, Community Involvement Coordinator, EPA Region 3 at: 215-814-5517, or by email at:
  • Chris Matta, Remedial Project Manager, EPA Region 3 at: 215-814-3317, or by email at:
  • For media inquiries: Roy Seneca, Office of Communications and Government Relations, U.S. EPA, Region 3 at: 215-814-5567, or by email at:

Related Documents and Websites 

For more information regarding DNREC's previous investigations at the Hockessin Groundwater Site and other nearby sites , please visit  DNREC's Delaware Environmental Navigator (DEN) at: for the following sites:

  • DE-1317: Hockessin Groundwater Site
  • DE-1591: Hockessin Cleaners
  • DE-1532: Sunrise Cleaners
  • DE-1590: Thompson Dry Cleaners

For additional information or questions regarding DNREC's investigations, please contact:

For more information on the contaminants of concern in the area, primarily tetrachloroethylene (PCE) and its degradation products in groundwater - trichloroethylene (TCE), dichloroethylene (DCE) and vinyl chloride (VC) - please visit:

  • Agency for Toxic Substances & Disease Registry (ATSDR) ToxFAQs for PCE; TCE1,2 DCE and VC

For more information regarding Artesian’s drinking water supply and treatment system, please click here, or contact:


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