Boston Edison Company (currently NSTAR) for many years operated a facility just behind the Watertown Mall.

Unfortunately the spill was not realized by Boston Edison (now NSTAR) company until about a month later, according to EPA and DEP reports.

Almost one thousand gallons of high PCB oil reached Sawins, some of it was recovered by Boston Edison company through remediation efforts on the property.

The rest is likely to have made its way into the Charles River, with the balance remaining in the pond sediments and comprising the detectable elevated levels seen by scientists today.

NSTAR, a major New England public electric utility, is responsible for the PCB pollution, but has refused to pay for the cleanup or for any assessment/engineering costs.