Hartford Water Hardness & Quality Report (2026)

The Metropolitan District Commission (MDC) supplies drinking water to Hartford and surrounding areas in Hartford County, Connecticut, serving approximately 400,000 people across 12 towns including West Hartford. Water is sourced entirely from two surface reservoirs: the Barkhamsted Reservoir (30 billion gallons) on the East Branch of the Farmington River, and the Nepaug Reservoir (9 billion gallons) on the Nepaug River, both located about 20 miles northwest of Hartford. Treatment occurs at facilities including the Reservoir 6 plant in Bloomfield, where over 140,000 tests are conducted annually for more than 130 contaminants; the utility distributes an average of 45 million gallons per day, meeting all state and federal standards.

The MDC's supply draws from the Farmington River watershed in Connecticut's northwest hills, a protected 89.7-square-mile area with active source protection programs. The underlying geology consists of ancient metamorphic rocks — schists and gneisses from Paleozoic Appalachian formations — with minimal carbonate rocks such as limestone or dolomite. Surface water in these reservoirs picks up very few dissolved ions from brief rock contact and organic-rich forested soils, resulting in very soft, low-mineralized water characteristically low in calcium and magnesium.

Hartford's very soft water means negligible scale buildup in pipes, water heaters, dishwashers, and laundry machines, reducing maintenance needs. Soap and detergents lather easily and no white mineral precipitates form on glassware or fixtures. A water softener is unnecessary and could over-treat the supply, potentially increasing corrosivity. MDC water is treated via coagulation, sedimentation, filtration, and disinfection; bromodichloromethane has been detected above health guidelines in West Hartford samples as a disinfection byproduct, though aggressive watershed protection maintains overall high quality and no major violations are reported.