Saint Gobain completes demolition of Meramec facility and evaluates PFAS leaching

The New Hampshire Environmental Services Department (NHDES) has reported significant progress in environmental remediation efforts following the closure of the Saint Gobain facility in Merrimack. As of June 6, 2025, the demolition of the facility is nearly complete, with all materials removed and disposed of, leaving only the former building pad. This closure follows the company's announcement in October 2023 to demolish the site, which included extensive preparations such as utility disconnections and hazardous material surveys.

In addition to the demolition, Saint Gobain is actively assessing potential PFAS leaching from the concrete using EPA-approved methods. NHDES has requested a final report documenting all demolition efforts, ensuring transparency and accountability in the process.

The meeting also highlighted ongoing efforts to provide clean drinking water to affected residents. Since late 2022, contractors have installed point-of-entry treatment (POET) systems in 708 out of 831 identified properties. Maintenance on these systems is ongoing, with annual reports requested to monitor their effectiveness.

Furthermore, municipal water connections are progressing in Litchfield, Bedford, Londonderry, and Merrimack, with significant construction completed. Property owners in these areas are being notified that bottled water services will no longer be provided as water main extensions and service connections are finalized.

NHDES continues to monitor drinking water quality, with approximately 769 properties sampled under a groundwater management plan. This proactive approach aims to identify and address any exceedances of drinking water standards, ensuring the safety and health of the community.

As these initiatives move forward, NHDES remains committed to keeping the public informed and engaged in the ongoing efforts to restore and protect the environment and public health in New Hampshire.