Lexington Water Hardness & Quality Report (2026)

Lexington, Massachusetts, in Middlesex County — one of the most historically significant towns in American history (Lexington is the 'Birthplace of American Liberty' — the town where the first shots of the American Revolutionary War were fired on April 19, 1775; the Battle of Lexington and Concord began at the Lexington Battle Green (the Lexington Common), where Lexington Minutemen faced British Regulars in the opening engagement of the American Revolution; the Minuteman National Historical Park, Battle Road Trail, and Lexington Battle Green are among the most visited historic sites in the eastern United States), home of the Hancock-Clarke House and Buckman Tavern (two of the most significant Revolutionary War-era buildings in America), a diverse Middlesex County community with a significant Chinese-American, Korean-American, Indian-American, and affluent professional population (Lexington is one of the most academically distinguished suburban communities in Massachusetts, with one of the top-rated public school districts in the state), and an historic Boston western suburb — draws its municipal water supply via the MWRA. Water hardness in Lexington measures 71 mg/L — classified as moderately soft.

Lexington's moderate softness reflects the MWRA Wachusett supply's calcareous-poor watershed with effective treatment. The MWRA distributes Wachusett Reservoir water to the northwest Boston Lexington zone (primarily 1920s–1960s suburban development mains), producing the moderately soft 71 mg/L.

With hardness at 71 mg/L, Lexington residents enjoy moderately soft water. MWRA consistently delivers water meeting all Massachusetts DEP and EPA Safe Drinking Water Act requirements.