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New Hampshire Department of Environmental Services

Media Center

DATE: October 1, 2018
CONTACT: James Martin, (603) 271-3710

NHDES Notifies Saint-Gobain Performance Plastics to Install Controls on Air Emissions

CONCORD, NH - The New Hampshire Department of Environmental Services (NHDES) announced today that it has instructed Saint-Gobain Performance Plastics (SGPP) to investigate and apply for a permit to install air pollution controls on its Merrimack facility. The notification, sent in a letter, requires SGPP to submit an application and Best Available Control Technology analysis within 6 months. This request comes as a result of two years of investigation by NHDES, and the authority provided to NHDES in a law that became effective on September 8, 2018, which authorized the Department to require controls for air emissions of certain PFAS compounds that impact soil and water.

SGPP has been working collaboratively with NHDES to perform stack tests in 2016 and 2018 to evaluate PFAS compound emissions from the facility and to evaluate the effectiveness of a pilot scale control device. The investigation concluded that the facility continues to have small emissions of PFAS compounds which could contribute to the existing groundwater exceedances of the current state Ambient Groundwater Quality Standard (AGQS) of 70 parts per trillion (ppt) for perfluorooctanoic acid (PFOA), 70 ppt for perfluorooctanesulfonic acid (PFOS) and 70 ppt for PFOA and PFOS combined.

NHDES will be providing an overview of all stack testing information at a public information meeting on October 10 in Merrimack ( The letter and supporting documents will be posted on the NHDES Onestop database: . For more information, please contact, Cathy Beahm, NHDES Air Resources Division, at or (603) 271-2822.

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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