Overpressurization of Natural Gas Distribution System, Explosions, and Fires, in Merrimack Valley, Massachusetts, September 13, 2018

The National Transportation Safety Board met on Sept. 24, 2019, at 9:30 a.m. (EDT), to determine the probable cause of the Sept. 13, 2018, series of explosions and fires in the Merrimack Valley in Massachusetts.

The explosions and fires occurred after high-pressure natural gas was released into a low-pressure gas distribution system in the northeast region of the Merrimack Valley. The system over-pressure damaged 131 structures, including five homes that were destroyed. Most of the damage was a result of structure fires ignited by gas-fueled appliances. One person was killed and 22 individuals, including three firefighters were transported to area hospitals.

The urgent safety recommendations issued earlier in the investigation are available at https://go.usa.gov/xVx73.

NTSB investigative staff and board members

An open to the public board meeting

NTSB Boardroom and Conference Center, 420 10th St., SW, Washington, DC

Tuesday, Sept. 24, 2019, 9:30 a.m. (EDT)

The public meeting will also be webcast. A link to the webcast will be available shortly before the start of the meeting at http://ntsb.windrosemedia.com/.



Watch the Board Meeting archive video on the NTSB YouTube Channel



Opening Statement - Chairman Robert L. Sumwalt

Staff presentations

Closing Statement - Chairman Robert L. Sumwalt



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If you wish to obtain a copy of an NTSB meeting, please contact the NTSB Records Management Division at (202) 314-6551,  or 800-877-6799. You may also request this information from the NTSB website,  or write to the following: National Transportation Safety Board, Records Management Division (CIO-40), 490 L'Enfant Plaza, SW, Washington, DC 20594.