Pickering Fire crews were on scene of a large blaze at the Dufferin Creek Water Pollution Control Plant Tuesday morning.
The fire broke out at around 9:20a.m. at the facility at Squires Beach Rd and McKay Rd.
No injuries were immediately reported, but a worker at the plant, Jamie Laroque called into Newstalk 1010's Jerry Agar show saying he heard two loud explosions.
The cause of the blaze was unclear as firefighters attempted to bring the fire under control.