Firefighters received a report of the spilled sulfuric acid, which is used to break down sewage, at the Deer Island Treatment Plant at 7:45 p.m., Boston Fire spokesman Steve MacDonald said.
The acid overflowed out of an outdoor holding tank, with some leaking onto the surrounding pavement, but workers were able to shut off a valve before more of it spilled, MacDonald said.
No one was injured, he said.
The spill was not related to the storm that blew through the area earlier today, said MacDonald. Source