mwra online
Water System
Sewer System
Harbor and Bay
School Program
About MWRA
Doing Business with MWRA
Contact MWRA

Water Treatment Plants
Massachusetts Water Resources Authority


MWRA has recently completed two new water treatment plants: The John J. Carroll Water Treatment Plant, in Marlborough (2005) and The Quabbin Water Treatment Plant, in Ludlow (2000).

Both facilities improve finished water quality and comply with state and federal drinking water standards.

Map of MWRA's treatment plants and other water facilities

MWRA's Integrated Water Supply Improvement Program

> larger image

John J. Carroll Water Treatment Plant, Marlborough

The John J. Carroll Water Treatment Plant

The John J. Carroll Treatment Plant treats drinking water for the majority of MWRA customers: residents and businesses in MetroWest and Metro Boston communities (>list of communities)

The John J. Carroll Plant uses ozone as a primary disinfectant and chloramines for residual disinfection, allowing MWRA to meet current and tougher future state and federal water quality standards. The plant has the capacity to treat up to 405 million gallons of water from the Wachusett Reservoir each day, though 270 million gallons per day is the average.



Read a summary of the Treatment Technology Decision Court Trial (December 6, 1999 – February 17, 2000) > Link




The Quabbin Water Treatment Plant, Ludlow

The Quabbin Water Treatment Plant

This plant treats drinking water for three Chicopee Valley communities: Chicopee, Wilbraham and South Hadley Fire District #1.

Water enters this plant directly from the pristine Quabbin Reservoir. It is treated with chlorine, for primary disinfection in accordance with the federal Safe Drinking Water Act.

Updated April 25, 2007