The two establishments existed side by side until they were both incorporated into the Metropolitan Water Board in 1903.
The bodies subsumed included the Metropolitan Water Board, the Thames Conservancy, the Lee Conservancy Catchment Board and parts of the Essex River Authority and the Kent River Authority which had formerly regulated the north bank and the south bank of the River Thames estuary.
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The Metropolitan Water Board selected the south branch of the Nashua River in Clinton as the best site for Boston's new water supply over New Hampshire's Lake Winnipesaukee, Maine's Sebago Lake, and the Merrimack River.