City employees reported a fire in the attic at the Waste Water Treatment Plant in Snoqualmie at 11:19 a.m. on Saturday, April 25. No injuries were reported, but damage costs rose to more than $20,000.

Snoqualmie Fire, Fall City Fire and Eastside Fire all responded to assist with fire suppression. The sprinklers activated, but didn’t suppress the fire. Crews reached the fire through roof access and found damage estimated at $25,000 and affecting the roof, roof sheeting and roof trusses.

The King County Sheriff Fire Investigation Unit took charge of the investigation, concluding it was accidental and caused by heat from the solid waste drying unit near a vent pipe.