MWRA will use ultraviolet light to disinfect water

The Massachusetts Water Resources Authority announced the completion and startup of a new ultraviolet disinfection facility, in its annual report on the quality of the state’s water.

The new disinfection facility is housed in the John J. Carroll Water Treatment Plant in Marlborough. It uses ultraviolet light to disinfect the water, killing pathogens such as bacteria and viruses without the use of excess chemicals, according to a statement from the authority.

Fred Laskey, MWRA executive director, said in a statement that he is proud that Massachusetts has been able to move away from using chlorine for water treatment to the more natural option.


At the plant, water is treated from the Quabbin Reservoir, about 65 miles west of Boston, and the Wachusett Reservoir, about 35 miles west of Boston. Nearly 200 million gallons of water are treated daily.

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The state’s water also passed hundreds of thousands of tests during the year, according to the report.

In addition, Quabbin water was voted the “Best of the Best” in a taste test held at a conference in June, the MWRA said.

Jacqueline Tempera can be reached at jacqueline.tempera
. Follow her on Twitter @jacktemp.