Photo courtesy of Marina Burity / CC BY-SA 2.0.

A utility company blamed for a series of natural gas explosions in the Merrimack that left one person dead and damaged dozens of homes has agreed to plead guilty to breaking pipeline safety laws, federal officials said Wednesday.

Columbia Gas will plead guilty to violating the Pipeline Safety Act following a federal investigation into the September 2018 explosions, the U.S. Attorney’s Office in Boston tweeted.

The company said in an emailed statement that it takes full responsibility for the disaster.

“Today’s resolution with the U.S. Attorney’s Office is an important part of addressing the impact,” the company wrote. “Our focus remains on enhancing safety, regaining the trust of our customers and ensuring that quality service is delivered.”

The company is being held criminally and financially accountable, the FBI said. Federal officials are expected to hold a news conference Wednesday morning to announce more details.

The explosions and fires in Lawrence, Andover and North Andover injured about 25 people and damaged or destroyed dozens of buildings. Many people were forced into temporary shelter, and thousands of homes and businesses went without natural gas service for weeks and even months during the winter. The utility was also forced to replace hundreds of gas appliances in the impacted homes.

Leonel Rondon, 18, died when a chimney collapsed on his vehicle in the driveway of a friend’s home. He had gotten his driver’s license just hours earlier.

Federal investigators blamed the explosions on overpressurized gas lines, saying the company failed to account for critical pressure sensors as workers replaced century-old cast-iron pipes in Lawrence. That omission caused high-pressure gas to flood the neighborhood’s distribution system at excessive levels.