Employees were forced to evacuate Andover's water treatment plant Monday after a chemical reaction set off hazardous fumes.
Andover Fire Chief Dan Winkel told KARE-TV a contractor was delivering chemicals to the plant and accidentally poured fluorine into the tank that holds chlorine, triggering the reaction.
Emergency response crews and an ambulance were sent to the plant Monday. The contractor was treated at the scene.
All of the city's water towers were full at the time, so none of the chemicals were pumped into Andover's water supply.
The building was ventilated. Officials say the public was not in danger.
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