During routine sampling on July 9th, the Department of Conservation and Recreation (DCR) reported an increase in levels of Chrysosphaerella algae in the Quabbin Reservoir. In accordance with our algae response plan, MWRA and DCR staff initiated our enhanced monitoring protocol which includes additional water quality sampling.

While the presence of low levels of algae (naturally occurring microscopic plants) is a sign of a healthy reservoir, this particular algae, Chrysosphaerella, can impart a metallic taste to tap water. Its presence, while changing the taste of the water, does not affect the water’s safety. MWRA has communicated with each of the CVA communities (Chicopee, South Hadley Fire District #1, and Wilbraham) regarding this algae asking them to forward taste complaints to the MWRA.

Operators from the Brutsch Water Treatment Facility are conducting a daily taste test of drinking water to monitor for any changes. DCR staff are sampling twice per week and calculating algae concentrations at different depths near our intake. MWRA Water Quality staff are also monitoring algae activity using the seasonal water quality buoy deployed near the water intake. Buoy water quality measurements help us to assess algae concentrations, by measuring for chlorophyll-a and other parameters. Additionally, continuous on-line analyzers monitor water quality immediately before and after chlorine and UV treatment, as well as at downstream facilities.

There have been only a few complaints received from CVA community residents; however, MWRA and DCR continue to monitor under its enhanced monitoring protocol. In the meantime, if you experience nuisance taste or odors you can chill the water in the refrigerator and/or add lemon to improve the taste.

Chrysosphaerella is a golden brown algae of the Chrysophyte family. This particular species of algae was also found to be present in Quabbin Reservoir in 2019 and 2021.

More information about the Quabbin Reservoir and water quality is available at MWRA.com.