This is the Massachusetts Water Resources Authority map from 2016, which we believe has not changed as of 2023. It shows active CSOs as green dots. CSOs with 25-year level of control as orange dots, CSOs with treatment facilities as green dots with yellow outlines, and closed CSOs as red dots. There are six UNTREATED and ACTIVE CSOs in the Alewife.
File Type: jpg
Categories: Arlington, Belmont, Cambridge, CSOs, MWRA, Somerville