ROCKLAND — A report of a hazardous material spill July 30 at the Rockland wastewater treatment plant ended up not being a hazard to the environment or human health.

The Rockland Fire and Emergency Medical Services department responded shortly after 2 p.m. to a report of a spill. Rockland Fire Chief Chris Whytock said as a precaution, crews blocked Captain Spear Drive to traffic.

The department already planned to drill with its aerial drone before the call, and decided to use it for this response. The chief said that until it was known what the chemical was, the crews wanted to be extra cautious, since wind was coming off the water and toward Main Street.

As it turns out, a delivery of sodium bisulfate was being made, and the truck driver went inside briefly. When she returned, found the chemical overflowing. Sodium bisulfate is used in one of the final treatment processes to remove chlorine before wastewater is discharged into Rockland Harbor.

About 100 gallons of the chemical is believed to have been spilled. The Maine Department of Environmental Protection was contacted and said there was no need for it to respond since the chemical is not hazardous in the water.

Crews left the scene before 3 p.m.

Stephen Betts