The Campton-Thornton Fire Rescue and the Thornton Police Department responded to a carbon monoxide detector activation in Thornton only one minute after midnight on January 1, 2026, which was the department's first call of the year.

When Ambulance 1 arrived, it found that the building had high levels of carbon monoxide. Rescue 1 and Car 1 were brought in to help with the need for further assistance. Firefighters assessed two residents and vented the building, but neither of them accepted medical attention or transportation. After clearing the area, Ambulance 1 went to Plymouth on mutual aid for another medical emergency, pointing out that earlier in the week, Plymouth Fire-Rescue had helped Campton-Thornton crews with two medical calls. Residents were permitted to go back inside when carbon monoxide levels were lowered and verified to be safe using monitoring equipment. A woodstove problem was thought to be the source of the increased readings.

Residents were advised by fire officials to make sure their carbon monoxide and smoke detectors are operational. Colourless and odourless, carbon monoxide exposure can cause headaches, nausea, and vomiting. Residents are encouraged to evacuate the building right once and SMS or contact 911 if a detector activates if exposure is suspected. The department encourages anyone in need of a detector to get in touch with them. Both Campton-Thornton Fire Rescue and Lakes Region Mutual Fire Aid are thought to have received their first call of 2026 as a result of this incident.