Delmarva Power Silverside-Naamans Transmission Line Site

Delmarva Power and Light has entered into an agreement with the DNREC Voluntary Cleanup Program to perform remedial actions addressing the release of lead-based paint into the environment from 17 electric transmission towers located between Silverside Road and Naamans Road in Wilmington. The Voluntary Cleanup Program (VCP) Agreement for the site, formally

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Delaware Brownfield Conference

The Delaware Brownfield Conference is set for Thursday, Aug. 20, 2026, starting at 9 a.m., at the Chase Center, in Wilmington. The conference will bring together environmental professionals, developers, municipal leaders, policymakers and community stakeholders for a dynamic day of learning, collaboration and inspiration. The conference is focused on education and real-world

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Notification of Negotiations for a Brownfields Development Agreement for 3, 11, 13 Gordon Street: Wilmington Hope Commission Inc.

DNREC’s Remediation Section is negotiation a Brownfields Development Agreement with Wilmington Hope Commission Inc. for three sites.

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East Basin Road Groundwater Site

The U.S. Environmental Protection Agency (EPA) has added the East Basin Road Groundwater Site in New Castle County to the Superfund National Priorities List (NPL). The site is an approximately seven-square mile area surrounding the city of New Castle’s public wells. [modal text=”DNREC Contacts” title=”DNREC Contacts”

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Georgetown North Groundwater Site

The U.S. Environmental Protection Agency (EPA) has added the Georgetown North Groundwater Site to the Superfund National Priorities List (NPL). The NPL is EPA’s list of priority sites requiring evaluation for possible remediation from releases of hazardous substances, pollutants or contaminants. [collapse type=”success” title=”DNREC

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Answers About the Brownfields Marketplace

The DNREC Remediation Section welcomes questions about the Brownfields Marketplace. Below are some questions that have been asked in the past and answers to those questions. [button type=”primary”

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Delaware Brownfields Marketplace

The Delaware Brownfields Marketplace lists brownfield sites in Delaware that are available for potential redevelopment. Developers may apply for grants to investigate and clean up these properties and receive liability protection for past environmental contamination. Learn About Brownfields

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PFAS Investigation Sites

This page contains a list of sites being investigated by DNREC for per- and polyfluoroalkyl substances (PFAS) in drinking water, groundwater or surface water in Delaware. Each listing includes the location and the site identification number used in the Delaware Environmental Navigator (DEN), which includes electronic copies of reports, studies, analysis, correspondence

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Exposure Assessment Near New Castle Air National Guard Base

In 2019, the Centers for Disease Control and Prevention (CDC) and the Agency for Toxic Substances and Disease Registry (ATSDR) initiated an exposure assessment for perf- and polyfluoroalkyl substances (PFAS) in the community near the New Castle Air National Guard Base in New Castle County. [panel

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Voluntary Cleanup Program

DNREC’s Voluntary Cleanup Program (VCP) is available to all parties who may be liable for the contamination of a property, but who wish to settle their liabilities with the Department of Natural Resources and Environmental Control under the Hazardous Substance Cleanup Act (HSCA).

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HSCA State Lead and Enforcement Programs

Delaware’s Hazardous Substance Cleanup Act (HSCA) (7 Del.C. Ch. 91) provides DNREC with the authority to take enforcement actions against responsible parties to ensure cleanup at sites with a release, or imminent threat of release, of hazardous substances. Remediation Section 391 Lukens Drive New

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Hazardous Waste Corrective Action

Corrective action is required under the federal Resource Conservation and Recovery Act (RCRA) for facilities that treat, store or dispose of hazardous wastes. The Act requires hazardous waste facilities to investigate and clean up releases of hazardous waste or constituents in soil, groundwater, surface water and air.

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Natural Resource Damage Assessment and Restoration

Natural Resource Damage Assessment and Restoration (NRDAR) is the process used to determine whether natural resources have been injured, destroyed, or lost as a result of a release of hazardous substances or oil, and to identify actions and funds needed to restore such resources. NRDAR is authorized by several state and federal environmental laws.

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HSCA Advisory Committee

The Hazardous Substance Cleanup Act (HSCA) Advisory Committee advises the Division of Waste and Hazardous Substances on rules, policies, and procedures relating to the cleanup and re-use of hazardous waste sites.

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Loans and Grants

Because of the the financial burden of completing environmental work at potentially contaminated properties within the State, DNREC has created different loans and grants to help property owners with remediation of contaminated properties. Remediation Section 391 Lukens Drive New Castle,

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Long-Term Stewardship

Long-term stewardship (LTS) is the maintenance and monitoring of the remedial measures taken at a site to maintain the desired level of protection of human health and the environment over an extended period of time. Remediation Section 391 Lukens Drive New

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Federal Programs

Various federal programs apply to sites being addressed by the DNREC Remediation Section.

National Priorities List (NPL) National Priorities List (NPL) sites are sites that pose a long term remedial response action that are carried out by EPA with DNREC involvement and assistance. EPA is the

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Risk Assessment and Cleanup Standards

The DNREC Division of Waste and Hazardous Substances sets standards for risk assessment and cleanup and remediation planning for contaminated sites. Cleanup and remediation are governed under the Delaware Hazardous Substance Cleanup Act, known as HSCA (7 Del. C. Ch.91). The HSCA Human Health Risk Assessment Guidance

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Environmental Investigation and Remediation Consultants

The Division of Waste and Hazardous Substances maintains a list of environmental investigation and remediation consultants. This list is provided to the regulated community to help select an environmental consultant for the investigation and remediation of leaking underground and aboveground storage tank sites. Inclusion on the list does not imply endorsement, recommendation

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Remediation Laws, Regulations and Guidance

Information regarding the laws, regulations, guidance, policies, standard operating procedures (SOPs) and other documents related to the programs administered by DNREC Remediation Section. The resources listed here are mostly PDF files, readable using Adobe Acrobat. Others are links to web pages. Some are WORD or Excel files, which should be downloaded and

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Hazardous Substance Cleanup Act Program

The Delaware Hazardous Substance Cleanup Act (HSCA) gives DNREC the ability to ensure cleanup of facilities with a release or imminent threat of release of hazardous substances.

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PCB Mass Loading Studies

The DNREC Division of Waste and Hazardous Substances and Division of Watershed Stewardship are working together to study polychlorinated biphenyls (PCBs) and how they enter surface waters from hazardous substance release sites around the state. Phase I Summary [button type=”primary”

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A Watershed Approach

The Watershed Approach to Toxics Assessment and Restoration (WATAR) is a watershed-scale approach to evaluating where contamination comes from, how it gets into Delaware’s waterways and water bodies, and what effects it has on watershed health. [panel type=”success” heading=”Contact

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PCB Mass Loading Studies: Phase II Report

The phase II report from the DNREC initiative to study polychlorinated biphenyls (PCBs) and how they enter surface waters from hazardous substance release sites around the state. PCB Mass Loading from Hazardous Substance Release Sites to Surface Waters in New Castle, Kent and Sussex Counties Part 1 — Summary

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PCB Mass Loading Studies: Phase I Report

The phase I report from the DNREC initiative to study polychlorinated biphenyls (PCBs) and how they enter surface waters from hazardous substance release sites around the state. PCB Mass Loading from Hazardous Substance Release Sites to Surface Waters of the Christina River Basin Report Summary Figure 1 Evaluated

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Blades Groundwater Site

On Sept. 1, 2020, the U.S. Environmental Protection Agency (EPA) announced the addition of the Blades Groundwater Site to the Superfund National Priorities List (NPL). The NPL is EPA’s list of priority sites with releases of hazardous substances, pollutants or contaminants requiring evaluation for possible remediation. The public announcement of the listing appears in the

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Brownfields Basics Workshop

In June 2019, DNREC held a Brownfields Basics Workshop focused specifically on resources available to non-profits, local governments and state agencies to aid in the redevelopment of Brownfields.  The presentations from that workshop are presented here as a resource.  They are posted as PDF files. For additional information on

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Brownfields

The DNREC Brownfields Development Program encourages the cleanup and redevelopment, reuse or expansion of properties which may be perceived to be environmentally contaminated. Mark your calendars: The Delaware Brownfield Conference is set for Thursday, Aug. 20, 2026, starting at 9 a.m., at the Chase Center, in Wilmington.

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The Remediation Section

The DNREC Remediation Section protects public health, welfare, and the environment in Delaware by identifying and cleaning up releases of hazardous waste, petroleum and other hazardous substances in the environment to an acceptable level of human-health and environmental risk, and supporting the continued safe use, re-use or enhanced productive use of remediated properties.

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