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The water infrastructure consists of 154 miles of water main,
two water storage tanks with total capacity of 3.1 million
gallons, 1,500 fire hydrants, 3,400 street and hydrant control
valves, and approximately 10,500 residential service line con
trol valves located on property lines. Four main transmission
lines from the Massachusetts Water Resources Authority
(MWRA) serve Lexington: a 16-inch main on Summer Street,
a 16-inch main on Massachusetts Avenue in East Lexington,
a 12-inch main on Watertown Street, and a 24-inch main on
Concord Avenue. The MWRA supplies Lexington with ap
proximately 2 billion gallons of water annually.
from 2025 annual town report