Currently, Lowell has nine CSO outfalls that contribute 430 million gallons of combined sewage to the Merrimack and Concord rivers and Beaver Brook in a typical year. The project will separate ...

Before construction of the CSOs more than 30 years ago, “there was a huge flush of debris” in the streams below the outfall pipes, along with “plume(s)” and oxygen “sag(s)” following ...