Crews responded to a gas leak at the Karns Meadow well house Tuesday, dealing with the hazard in two hours.

No evacuations were required. Jackson Hole Fire/EMS, the Region 8 Regional Emergency Response Team and town of Jackson Public Works Department staff responded, some in hazmat suits.

“Two compressed cylinders of chlorine gas were turned off and gas levels were monitored to ensure the leak had been terminated,” a press release said.

Fire Marshal Kathy Clay called it a “very high-risk incident” due to the danger posed by chlorine gas.

John Ryan, town of Jackson water utility manager, said a malfunctioning valve between two cylinders broke and leaked less than a pound of chlorine.

The broken valve was “very unusual,” Ryan said. It’s back in service now.