Federal workplace safety officials announced Tuesday they are imposing penalties totaling $246,609 against three companies following the tragic deaths of six dairy workers who lost their lives due to toxic gas exposure at a Colorado facility.
The deadly incident occurred on August 20, 2025, when a manure pipe became disconnected in a confined area, releasing lethal hydrogen sulfide gas that killed five men and one teenager. The tragedy devastated the small farming communities near Keenesburg, located about 35 miles northeast of Denver.
The U.S. Occupational Safety and Health Administration hit the dairy operation, Prospect Ranch LLC, with the steepest penalty of $132,406 for multiple serious safety violations. Officials cited the company for inadequate worker training, poor safety planning, and failing to safeguard employees from dangerous atmospheric conditions. The company has not yet responded to requests for comment.
Federal regulators also levied fines against two contractors who were working on the manure handling system when the fatal gas release occurred, according to Tuesday’s government announcement.
Colorado-based Fiske Inc., whose subsidiary High Plains Robotics maintains dairy equipment and employed several of the victims, received a $99,306 penalty for failing to protect workers and not providing proper hydrogen sulfide detection training.
OSHA officials described the sequence of events in their statement: “A Fiske employee and a Prospect Ranch employee attempted to stop the flow but were overcome by the gas. Subsequently, three more Fiske employees and one Prospect Ranch employee entered the pump room, which led to the loss of a total of six workers.”
The Weld County medical examiner confirmed through post-mortem examinations and toxicology analysis that hydrogen sulfide gas exposure caused the deaths, though few details about the specific circumstances were released beyond describing it as an industrial accident in a restricted space at the dairy operation.
A third contractor, HD Builders, received a $14,897 citation for lacking proper written hazard communication procedures and failing to train workers on hydrogen sulfide detection. Workers from this company were on-site when the pipe failure occurred but escaped injury.
All three companies now have 15 days to either pay the proposed penalties, request informal discussions with safety officials, or contest the citations before an occupational safety review board.
Confined space dangers at agricultural facilities represent a persistent and well-documented threat to farm workers nationwide, frequently involving exposure to invisible, odorless toxic gases or suffocation in enclosed areas where oxygen levels have dropped dangerously low.
Emergency responders from the local Weld County fire department arrived at Prospect Ranch around 6 p.m. on August 20 and took extensive safety measures before entering the confined area.
All six victims were Latino workers, ages 17 to 50. Tragically, four of the deceased, including the teenage high school student, belonged to the same extended family.
The victims included Alejandro Espinoza Cruz from Nunn, who died alongside his 17-year-old son Oscar Espinoza Leos and another son, 29-year-old Carlos Espinoza Prado.
The Espinoza family was connected through marriage to another victim, 36-year-old Jorge Sanchez Pena from Greeley, according to the county medical examiner.
The remaining two workers who perished were Ricardo Gomez Galvan, 40, and Noe Montañez Casañas, 32, both residents of Keenesburg.
Montañez Casañas, a veterinarian working in the United States on a visa, was laid to rest in his home state of Hidalgo in central Mexico, with assistance from the Mexican consulate in Denver.
