EPA Proposes Plan to Remedy Drinking Water Contamination at New Hampshire Superfund Site

EPA Proposes $6.8 Million Plan to Address Drinking Water Contamination in Londonderry, NH

Teh U.S. Environmental Protection Agency (EPA) has put forth a proposed plan for an interim remedy aimed at tackling drinking water contamination at the Tinkham Garage Superfund Site in Londonderry, New Hampshire. The agency is actively soliciting public feedback on this plan, with the comment period running from July 11 to August 12, 2025.

the proposed solution, estimated to cost approximately $6.8 million, focuses on providing alternative water sources to mitigate risks for residents who rely on groundwater for their drinking water. The EPA is particularly interested in community input on its preferred interim remedy and has scheduled public meetings to facilitate this.

Key components of the proposed interim remedy include:

Waterline Extension: Extending the existing municipal water line to include target neighborhoods where groundwater is used as a drinking water source.Homes impacted or perhaps impacted by contaminants that are not currently connected will be brought onto the municipal system.
Well Disconnection: Disconnecting private water supply wells from the contaminated groundwater.
* Long-Term Monitoring: Implementing ongoing groundwater monitoring and periodic reviews, at least every five years, to ensure the long-term effectiveness and protectiveness of the implemented remedy.

The Tinkham Garage Superfund Site, spanning approximately 375 acres in Londonderry, encompasses residential, commercial, and undeveloped conservation areas.Contamination, specifically volatile organic compounds (including 1,4-dioxane) and per- and polyfluoroalkyl substances (PFAS), has been detected in groundwater and water supply wells downgradient from the site. These levels pose an unacceptable risk to human health and the habitat, prompting monitoring efforts as 2018.

The EPA will hold an informational meeting on July 10, 2025, from 6:00 PM to 7:30 PM at the Moose Hill Council Chambers (268 Mammoth Rd B, Londonderry, NH 03053) to answer community questions. A public hearing on the proposed plan will follow on July 29, 2025, at the same location and time.

Following the public comment period, the EPA anticipates finalizing its decision in September. This interim action is a crucial step towards a complete final remedy for the site, which will be resolute after the completion of ongoing remedial investigations.

What specific health risks are associated with PFAS exposure, as highlighted by the EPA’s concern regarding the New Hampshire Superfund site?

understanding the New Hampshire Superfund Site & PFAS Contamination

The Environmental Protection Agency (EPA) has proposed a comprehensive remediation plan to address drinking water contamination stemming from a Superfund site in New Hampshire. This contamination centers around per- adn polyfluoroalkyl substances (PFAS), a group of man-made chemicals linked to various health concerns. The EPA’s action, authorized by both environmental laws and Presidential Executive Orders, aims to protect public health and restore the habitat.Understanding the specifics of this plan is crucial for residents, local officials, and anyone concerned about water quality and PFAS contamination.

The Source of the Contamination: Saint-Gobain Performance Plastics

The Superfund site in question is linked to the former Saint-Gobain Performance Plastics facility in Merrimack, New Hampshire. For decades, the facility manufactured coated fabrics and other products utilizing PFAS chemicals. These chemicals, known for their non-stick and water-resistant properties, leached into the surrounding groundwater, ultimately impacting private wells and the public drinking water supply. The EPA identifies facilities like Saint-Gobain as key contributors to environmental contamination requiring Superfund intervention.

Proposed Remediation Plan: A Multi-Phased Approach

The EPA’s proposed plan outlines a multi-phased approach to address the contamination. It focuses on several key areas:

Expanded Groundwater Monitoring: Continued and expanded monitoring of groundwater wells to track the extent of PFAS plume migration. This data will inform future remediation efforts and ensure the plan’s effectiveness.

Activated Carbon treatment: Installation and operation of granular activated carbon (GAC) treatment systems at affected private wells. GAC is a proven technology for removing PFAS from drinking water. This provides an immediate solution for impacted residents.

Source Control Measures: Implementing measures to control the source of the contamination at the former Saint-Gobain facility. This includes containing contaminated runoff and preventing further release of PFAS into the environment.

Long-Term Groundwater Remediation: Exploring and implementing long-term groundwater remediation technologies. Options being considered include pump-and-treat systems and in-situ treatment methods.

Public Water supply Connection: Extending the municipal water supply to areas heavily impacted by PFAS contamination, offering a permanent solution for residents reliant on private wells.

Health Impacts of PFAS & why Remediation is Critical

PFAS are often called “forever chemicals” due to their persistence in the environment and the human body. Exposure to PFAS has been linked to a range of adverse health effects, including:

Immune System Suppression: reduced antibody response to vaccines.

cancer Risk: Increased risk of kidney and testicular cancer.

Thyroid Disruption: Interference with thyroid hormone levels.

Developmental Effects: Potential impacts on fetal and infant advancement.

Cholesterol levels: Increased cholesterol levels.

The EPA’s remediation plan is vital to mitigate these risks and protect the health of the New Hampshire community. Drinking water safety is paramount, and this plan represents a meaningful step towards ensuring that goal.

The Role of the Superfund program & EPA Regulations

The Superfund program, officially known as the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), provides the EPA with the authority to clean up contaminated sites.The EPA’s ability to act stems from Congressional authorization to write regulations implementing environmental laws. This includes setting standards for PFAS levels in drinking water and overseeing the cleanup of sites like the Saint-Gobain facility. Presidential Executive Orders also influence the EPA’s activities, further emphasizing the importance of environmental protection.

Community Involvement & Public Comment Period

The EPA is actively seeking public input on the proposed remediation plan. A public comment period is open,allowing residents and stakeholders to voice their concerns and suggestions. The EPA will review all comments received before finalizing the plan. This collaborative approach ensures that the remediation efforts are tailored to the specific needs of the community. Information on how to submit comments and access relevant documents can be found on the EPA’s website.

Looking Ahead: Long-Term Monitoring & Prevention

Even after the initial remediation phases are complete, long-term monitoring will be essential to ensure the effectiveness of the plan and prevent future contamination. This includes regular testing of groundwater and drinking water, and also ongoing assessment of the site’s environmental conditions. Furthermore, proactive measures to prevent PFAS contamination at other facilities are crucial to protect public health nationwide. This includes stricter regulations on PFAS use and disposal, as well as investment in research and development of safer alternatives. Environmental regulations are constantly evolving to address emerging threats like PFAS.