The John J. Carroll Water Treatment Plant (CWTP) is a water treatment plant operated since 2005 by the

Massachusetts Water Resources Authority The Massachusetts Water Resources Authority (MWRA) is a public authority in the Commonwealth of Massachusetts that provides wholesale drinking water and sewage services to certain municipalities and industrial users in the state, primarily in th ...

(MWRA) to treat water bound for

Greater Boston Greater Boston is the metropolitan region of New England encompassing the municipality of Boston (the capital of the U.S. state of Massachusetts and the most populous city in New England) and its surrounding areas. The region forms the northern ar ...

. The plant is located at the town lines of

Marlborough Marlborough may refer to: Places United Kingdom * Marlborough, Wiltshire, England ** Marlborough College, public school * Marlborough School, Woodstock in Oxfordshire, England * The Marlborough Science Academy in Hertfordshire, England Austral ...

, Northborough, and

Southborough, Massachusetts Southborough is a town in Worcester County, Massachusetts, United States. It incorporates the villages of Cordaville, Fayville, and Southville. Its name is often informally shortened to Southboro, a usage seen on many area signs and maps, though ...

History

CWTP is named after John J. Carroll, an original member of the

(MWRA) board of directors. It was constructed from 1999 to 2005, and opened in July 2005. It replaced a prior facility only used for pH control. In addition to water treatment, CWTP has five concrete contact chambers capable of storing . Its construction budget was US$340 million.

Operation

For water treatment, CWTP utilizes four

ozone Ozone (), or trioxygen, is an inorganic molecule with the chemical formula . It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope , breaking down in the lo ...

generators, designed to handle an average capacity of per day—although average daily consumption is lower, at approximately —and a peak level of per day. Ultraviolet light treatment was added in April 2014. A 500 kW

photovoltaic array A photovoltaic system, also PV system or solar power system, is an electric power system designed to supply usable solar power by means of photovoltaics. It consists of an arrangement of several components, including solar panels to absorb and co ...

is used to harness solar energy, reducing operational cost. , water treatment performed at CWTP consists of: Water for CWTP comes from the

Wachusett Reservoir The Wachusett Reservoir is the second largest body of water in the state of Massachusetts. It is located in central Massachusetts, northeast of Worcester. It is part of the water supply system for metropolitan Boston maintained by the Massachuset ...

, primarily via the

Cosgrove Tunnel The Cosgrove Aqueduct, also called the Cosgrove Tunnel, forms part of the water supply system for the communities of the Greater Boston area in eastern Massachusetts that are served by the Massachusetts Water Resources Authority. It is a man-made t ...

, with the

Wachusett Aqueduct The Wachusett Aqueduct is a secondary aqueduct that carries water from the Wachusett Reservoir to the John J. Carroll Water Treatment Plant at Walnut Hill in Marlborough, Massachusetts. It is part of the public water supply system for the commu ...

as a standby backup. Treated water then flows towards

Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...

primarily via the MetroWest Water Supply Tunnel, with the

Hultman Aqueduct The Hultman Aqueduct forms part of the water supply system of eastern Massachusetts, managed by the Massachusetts Water Resources Authority (MWRA). The aqueduct extends from Southborough to Weston, connecting the Cosgrove Tunnel to the distributi ...

as a secondary system. The

Sudbury Aqueduct The Sudbury Aqueduct is an aqueduct in Massachusetts. It runs for from Farm Pond at Waverly Street in Framingham to Chestnut Hill Reservoir in Boston’s Chestnut Hill neighborhood. A later built extension main runs from the Farm Pond gateh ...

and

Weston Aqueduct The Weston Aqueduct is an aqueduct operated by the Massachusetts Water Resources Authority (MWRA). Now part of the MWRA backup systems, it was designed to deliver water from the Sudbury Reservoir in Framingham to the Weston Reservoir in Weston. ...

serve as emergency backups.

References

External links

* {{DEFAULTSORT:Carroll Water Treatment Plant Water supply and sanitation in Massachusetts Buildings and structures in Marlborough, Massachusetts

History

Operation

References

Further reading

External links