- November 16, 2022 — Washington Gas — Quince Orchard Boulevard — Gaithersburg
As of the end of November 2022, the investigation was ongoing and a cause for the explosion had not been fully determined. Montgomery County Police determined that the sole victim of the explosion died by suicide and that the explosion was likely the result of an intentional and criminal act. Washington Gas investigated the scene and did not detect any leaks at the incident location or surrounding area.
- March 3, 2022 — Washington Gas — Friendly Garden — Silver Spring
According to the Montgomery County Fire Chief, a building maintenance worker at the Friendly Garden Apartments accidentally cut a gas line. The maintenance worker was trying to fix a clogged drain in a first-floor apartment. He mistook a gas line in the basement for a drain waste pipe. When he cut the line, gas filled the basement and caused an explosion. The source of ignition remains unknown.
- August 10, 2020 — BGE — Labyrinth Road — Baltimore City
From BGE’s website: “BGE’s equipment — gas mains, gas service pipes, gas meters and electric equipment — was operating safely and were not the cause of the natural gas explosion that occurred on Aug. 10, 2020. The investigation into the specific events leading to the explosion was conducted by the Baltimore City Fire Department, which indicated today that work was being done on customer equipment by a licensed contractor in the basement of 4232 Labyrinth Road with no evidence of a Baltimore City permit. According to the Fire Department, a build-up of natural gas occurred and was ignited when a stove was turned on.”
- August 25, 2019 — BGE — Stanford Boulevard — Columbia
From Commission Order imposing penalty: “BGE agreed that the cause of the explosion was buried electric service cables that failed for unknown reasons, causing a significant thermal event that damaged a two-inch high pressure plastic service pipe located in a joint trench. BGE conceded that the joint trench installations at the Stanford Boulevard building did not adhere to its internal construction standards in 1997. However, between 1997 and the 2019 explosion at Stanford Boulevard, BGE had enhanced its joint trench installation practices in several ways.”
- August 10, 2016 — Washington Gas — Flower Branch — Silver Spring
The NTSB concluded that the probable cause of the explosion was the combined effect of a failed mercury service regulator and a disconnected vent line. Washington Gas disputed the finding and contends that “the accident was caused by a sequence of events which remain unknown to this day.”
- September 23, 2015 — BGE — Sleepy Horse Lane — Columbia
According to the Commission’s Engineering Division’s investigation, the homeowner damaged the natural gas piping while backing her car out of the garage. The homeowner indicated that the car door was open when the damage occurred, and she did not stop to check to see what was struck. As a result of the damage to the gas piping, natural gas leaked from the piping, filling the garage with gas and resulting in an explosion.