Cuisine Solutions Ammonia Release

On the evening of 31 July 2024, the Cuisine Solutions food processing facility in Sterling, Virginia, experienced a major industrial accident involving the release of approximately 275 pounds (125 kg) of anhydrous ammonia. The facility, which produces "sous-vide" packaged meals for global clients, relies on a large-scale industrial refrigeration system. At approximately 8:20 p.m., a technical failure occurred within a component known as the Heat Exchanger 5 Surge Drum.

The CSB’s final report, released in September 2025, identified that a process upset caused a rapid overpressure event. This triggered a pressure relief valve, which discharged the ammonia horizontally near the building's roof. Because the release consisted of a "two-phase" flow—a mixture of liquid and gas—it did not dissipate into the atmosphere. Instead, it formed a dense, heavy cloud that rapidly settled at ground level. This cloud reached concentrations classified as "Immediately Dangerous to Life or Health" (IDLH).

The most harrowing aspect of the incident involved the facility's evacuation. Investigators discovered that the plant lacked automatic ammonia detection alarms and shut-down systems. Consequently, many of the 286 personnel on-site were only alerted to the danger when they physically smelled the ammonia. As workers followed the established Emergency Action Plan (EAP), they were directed toward evacuation assembly points that were, unfortunately, located directly in the path of the settling toxic cloud.

First responders arriving on the scene found more than ten individuals unconscious on the ground. The lack of coordination and the failure to provide proper personal protective equipment (PPE) for the emergency response team further complicated the rescue. The CSB concluded that the "serious weaknesses" in the EAP were a primary factor in the high number of injuries. Specifically, the inquiry highlighted that the company had failed to conduct adequate drills for a release of this magnitude and had not considered the environmental factors, such as wind direction and cloud density, when designating safe zones. The resulting report serves as a stark warning to the food industry about the dangers of "complacency" in managing highly toxic refrigerants.