WATER CUSTOMER NOTICE

Metallic-Tasting Algae in Reservoir

Starting in mid July, an algae bloom occurred in the Quabbin reservoir. While the presence of low levels

of algae (naturally occurring microscopic plants) is a sign of a healthy reservoir, this particular bloom

consists of Chrysosphaerella algae, which leaves a metallic taste to tap water. While this algae bloom

presents a nuisance taste and odor condition, the water remains safe to drink. In the meantime, chilling

water in the refrigerator and/or adding lemon is the easiest way to improve the taste.

The bloom is being monitored by Department of Conservation and Recreation (DCR) and MWRA three

days per week. Staff are collecting samples in the reservoir, performing microscopic analyses, and

identifying and counting the algae concentrations. MWRA is also communicating with each of the

Chicopee Valley Aqueduct communities several times per week. In addition, water quality is monitored

continuously with on-line analyzers immediately before and after treatment at the Brutsch Water

Treatment Facility, as well as further downstream.

This Chrysosphaerella bloom occurred starting around July 17th. Chrysosphaerella is a golden brown

algae of the Chrysophyte family. For more information about Quabbin Reservoir and water quality is

available at MWRA.com.