Reading Water Hardness & Quality Report (2026)

Reading, Massachusetts, in Middlesex County north of Boston, receives its municipal water from the Reading Water Division, which draws from local surface water reservoirs in the Ipswich River headwaters watershed and supplementary supply from the Massachusetts Water Resources Authority (MWRA) metropolitan system. Reading's local reservoirs — including Birch Meadow Reservoir and associated impoundments — collect surface runoff and shallow groundwater from the glaciated Essex-Middlesex upland north of Boston. The MWRA connection provides backup capacity from Quabbin Reservoir during peak demand periods.

The extraordinarily soft 20.5 mg/L hardness and ultra-low TDS of 31.4 mg/L place Reading among the softest municipal supplies in the United States. The Reading watershed drains across Precambrian Andover Granite and Paleozoic metasedimentary rocks — ancient crystalline igneous and metamorphic formations with absolutely no soluble carbonate mineral content. New England's Precambrian basement rock (granites, gneisses, metavolcanics) and overlying thin glacial soils produce naturally ultra-soft rainwater runoff with almost no dissolved mineral accumulation. Quabbin Reservoir water adds similarly ultra-soft supply from the Central Highland watershed.

At 20.5 mg/L, Reading has exceptionally soft water — essentially zero scale formation under any household conditions. Soap lathers cloud-like, appliances need descaling at most once a year under normal use, and glassware emerges spotless from the dishwasher without any rinse aid. The primary consideration with Reading's ultra-soft supply is its aggressive corrosive chemistry — at this very low hardness, the water can slowly leach trace copper or lead from household plumbing, particularly in older homes. Reading DPW manages pH carefully to reduce corrosivity, but residents in pre-1986 homes should flush cold taps for 30 seconds before drinking any first-draw water. The PFAS level of 4.5 ppt is worth noting for a community this close to the Route 128 technology corridor.