Concord Water Hardness & Quality Report (2026)

Concord Water Department, operating as part of the Town of Concord, Massachusetts, serves approximately 18,156 residents in Middlesex County. The utility draws from both the Concord River (surface water) and multiple local groundwater wells. Key facilities include the Spring Brook Wellfield and river intake points, all treated at the town's water treatment plant on Keyes Road. The mixed supply integrates river withdrawals with well production, drawing from the Assabet, Concord, and Sudbury (SuAsCo) river watershed northwest of Boston for year-round reliability.

The supply originates in the SuAsCo Watershed, where glacial deposits from the last Ice Age overlie fractured Quincy Granite and metamorphic bedrock of the Cambrian-Ordovician period, including the Pennsylvanian-age Worcester Coal Mine Formation. These granitic and metamorphic rocks contribute dissolved calcium and magnesium through recharge via fractured bedrock and overlying glacial sands. Surface water additionally picks up minerals from limestone-bearing sediments and agricultural soils in the watershed, resulting in a moderately mineralized supply.

As a moderately soft supply, Concord water causes moderate scale buildup in water heaters, dishwashers, and coffee makers, with occasional staining on fixtures. Laundry may feel stiffer without softeners. Maintenance tips include setting hot water below 140°F, regular tank flushing, vinegar descaling, and phosphate-free detergents. A water softener is often recommended for households noticing scaling. The utility reports compliance with most EPA standards; treatment involves filtration, disinfection, and possible aeration for iron and manganese. Residents can call 978-318-3250 for testing or audits.