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

 DNREC Remediation Section (formerly the Site Investigation & Restoration Section)


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ADVISORY: Artesian Water Company and the City of New Castle Municipal Services Commission detected perfluorooctanoic sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in public water supply wells in the New Castle County Airport area that are above the U.S. EPA’s 2016 lifetime health advisory level of 0.07 parts per billion. The public drinking water is treated to remove the contaminants. More information is available at: PFAS Fact Sheet New Castle Public Supply Wells (includes PFOS/PFOA)The Agency for Toxic Substances and Disease Registry (ATSDR) is offering free voluntary medical testing for PFAS to a random selection of households in New Castle near the New Castle Air National Guard Base who may have had PFAS in their drinking water in the past. More information on ATSDR’s testing program is available here.

Delaware Drycleaner Initiative Report: Drycleaners and the Chlorinated Solvent ProblemDNREC-RS contracted with an environmental consultant to collect, analyze, and map various datasets pertaining to businesses that currently use and/or may have potentially used chlorinated solvents within the state of Delaware. The objectives of the investigation were to identify current and former potential sources of chlorinated solvent contamination, particularly, dry-cleaning facilities in the municipalities of Dover, Georgetown, and Newark; and to collect, analyze, and input the data into a working geographical information system (GIS) application to evaluate the impact of the operations on groundwater. The report is available here.

Brownfields Information:


Delaware enacted its Hazardous Substance Cleanup Act (HSCA) in 1990 to address sites potentially contaminated with hazardous substance releases in the state that would not be addressed under the federal superfund program. Three major programs are administered under HSCA. They are the Voluntary Cleanup Program (VCP), the Brownfields Program, and the HSCA Enforcement program. We also have a Prospective Purchaser Agreement Program and an Application for that program is available.

The Voluntary Cleanup Program (VCP) has been developed to assist the responsible parties to voluntarily clean up properties contaminated by the release of hazardous substances. The benefit of participating in the VCP is that it can eliminate the need for costly litigation. 

In July of 1995, HSCA was amended to encourage voluntary cleanup of sites and in 2001, enabling legislation that introduced brownfields was enacted.  On August 3, 2004 the Brownfields Development Act was signed to extend certain liability protection to developers of properties that DNREC certifies as Brownfields in an effort to encourage development. The Brownfield program allows developers and prospective purchasers who did not contribute to the contamination on their site to clean up their site and not be liable for pre-existing contamination.

The Seeds of Greatness Church in New Castle sits near a remediated brownfield that was once an unpermitted landfillDNREC has made funds available for eligible activities related to environmental remediation and investigation as detailed in the Hazardous Substance Cleanup Act Policy on Brownfields Grants. Brownfields are defined as abandoned, vacant, or underused real property where development or redevelopment may be hindered by the reasonably held belief that the property may be environmentally contaminated. A study was recently conducted by the University of Delaware to quantify the significant economic benefit of the brownfields program. You may read more about the study in a press release written about it, and will also find the the brownfields study online.

You may also want to visit the Delaware Brownfields Marketplace. The Marketplace is an interactive database that contains a list of market-ready brownfield sites available for redevelopment in Delaware. The inventory is designed to make it easier for potential buyers and developers to locate available brownfield properties. Brownfields property owners may also submit their properties for potential listing on the Marketplace.

The HSCA Enforcement program requires the responsible party to clean up sites contaminated with hazardous substances and allows DNREC to recover the costs from the responsible party in the event that DNREC must perform the cleanup. It also allows the use of the HSCA fund to cleanup sites where a viable responsible party is not identifiable. 

SIRS conducts Natural Resource Damage Assessments and Restoration (NRDAR) with DNREC's Division of Fish & WildlifeDivision of Water, and various federal agencies including the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Fish & Wildlife Service (USFWS) to restore habitat and recreation that was lost due to contamination.

SIRS assists EPA with oversight for CERCLA sites, including Preliminary Assessment/Site Inspection (PA/SI) and National Priorities List (NPL) sites. SIRS also provides oversight for active Department of Defense (DoD) sites and Formerly Used Defense Sites (FUDS). 

Remediation Section Mission Statement

The mission of the Remediation Section is to identify sites with releases of hazardous substances, prioritize them for cleanup based on the risk posed by these sites to public health, safety and the environment, and to promote the reuse of contaminated properties. 

The Division of Waste & Hazardous Substances' Remediation Section (RS) formerly known as the Site Investigation & Restoration Section (SIRS), is responsible for the identification, evaluation and remediation of sites within the state of Delaware that had past releases of hazardous substances. The Section manages the hazardous substance release sites in Delaware in accordance with the Hazardous Substance Cleanup Act (HSCA). The RS administrator is Qazi Salahuddin. He can be reached at or 302-395-2600. The RS office address is 391 Lukens Drive, New Castle, DE 19720 (Map & Driving Directions).

NOTICE: EPA Brownfield Grant Applications Submission DEADLINE: Oct. 28, 2020

EPA, with support from DNREC and DPH, held a public information meeting about the listing on December 5, 2019 at the Blades Fire Hall. More information on the proposed listing is available on the Blades Groundwater Site.

ADVISORY: On Nov. 8, 2019, the U.S. Environmental Protection Agency (EPA) proposed adding the Blades Groundwater Site to the Superfund National Priorities List (NPL). The NPL is EPA’s list of priority sites where there have been releases of hazardous substances, pollutants or contaminants requiring evaluation for possible remediation. When the Blades Groundwater Site – which DNREC began treating with carbon filtration in 2018 to maintain safe use of the town’s water supply – is listed to the NPL, it will be eligible for remedial action financed under the federal Superfund program. NPL eligibility will allow EPA to use Superfund authority and resources to help DNREC continue to investigate and remediate the contamination and protect human health and the environment in Blades. DNREC requested EPA’s assistance with the management and remediation of the site due to the complex nature of the hazardous chemicals and the extent of the contamination. DNREC worked closely with the EPA and the Delaware Division of Public Health (DPH) in February 2018 identifying per- and polyfluoroalkyl substances (PFAS) contamination, notifying local officials and the public, and securing safe drinking water supplies.

Regulations Governing Hazardous Substance Cleanup UPDATED March 11, 2019Click here for the regulations.

The EPA listed the Hockessin Groundwater Site on the National Priorities List (NPL) on May 17, 2018. The listing allows EPA to use Superfund authority and resources to work with DNREC to help resolve groundwater concerns in the Hockessin area. Information is available on the Hockessin Groundwater Site.The U.S. Environmental Protection Agency (EPA) also listed the Newark South Groundwater Plume Site on the NPL on Jan. 18, 2018. More information is available on the Newark South Groundwater Plume Site.

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