A worker with the Department of Environmental Protection was killed Saturday morning in a "large" explosion while working on a docked boat in the Hudson River, the agency and the FDNY said.

The 59-year-old male employee, who had worked for the DEP for 33 years, was pronounced dead at the North River Wastewater Resource Recovery Facility at approximately West 136th Street in Harlem, which is where the incident occurred at about 10:30 a.m., DEP and NYPD officials said.

Another employee of the agency was taken to the hospital, and a third worker refused medical attention, the DEP said. Both were in stable condition, according to the FDNY.

“The entire DEP family is grieving today,” DEP Commissioner Rohit T. Aggarwala said in a statement. “Our employee who lost his life had served the Department and the City with dedication for 33 years. He was a valued and experienced member of the Bureau of Wastewater Treatment, and his decades of service reflect his commitment to DEP’s mission.”

FDNY Deputy Assistant Chief David S. Simms said during a briefing at the scene that a large explosion had occurred in one of the holds of the boat, which is named Hunts Point and is used to transport raw sewage to the treatment plant where it was docked.

Simms said the worker who was killed was blown between the pier and the vessel he was working on by the force of the explosion. FDNY members performed a technical rescue to reach this worker, he said.

"Due to the nature of the explosion, there was raw sewage on the deck. We had to decontaminate all FDNY personnel at this incident," Simms said.

He added that the cause of the explosion was under investigation by the department's Bureau of Fire Investigation and would not speculate if it had been the result by methane buildup, when asked by reporters.

Mayor Eric Adams shared a statement saying he was devastated to learn about the employee's death and offered his condolences to the worker's loved ones.

"At this time, there is no suspicion of criminality and no impact on the facility," the mayor said. "The safety and well-being of our city’s workforce, and all New Yorkers, is always our top priority, and we are committed to fully supporting an investigation and ensuring that every possible measure is taken to prevent such tragedies in the future.“

Plant operations at the wastewater treatment facility were not impacted, and there did not appear to be any environmental impacts, the DEP said.

The U.S. Coast Guard said it had been assisting the FDNY Saturday morning at the scene.