Southington Water Hardness & Quality Report (2026)

Southington Water Department serves 43,069 residents in Southington, Connecticut. The utility operates a mixed surface-water and groundwater system comprising three reservoirs on the Southington-Wolcott town line (Southington Reservoir #1, #2, and #3) and six groundwater wells distributed throughout town. Water is treated according to source characteristics before distribution through an extensive underground pipeline network.

The Southington supply originates in the Farmington River watershed, approximately 20 miles northwest of Hartford in Connecticut's northwest hills. The East Branch of the Farmington River and its tributary, the Nepaug River, feed the Barkhamsted Reservoir (30 billion gallons, impounded by Saville Dam near New Hartford) and Nepaug Reservoir (9 billion gallons, created by Phelps Brook and Nepaug Dams near Collinsville). The watershed covers approximately 89.7 square miles. Glacial deposits and underlying bedrock geology naturally contribute dissolved calcium and magnesium carbonates, creating a hard water supply.

Hard water in Southington leads to accelerated scale buildup in water heaters, reduced soap and detergent efficiency, and mineral deposits on fixtures, dishwashers, washing machines, and hot water systems. Regular descaling of kettles and coffee makers is necessary. A water softener is recommended, particularly for households with high hot water usage or sensitive skin conditions. Southington's water meets all federal legal limits with zero MCL violations, though three contaminants exceed EPA health-based guidelines (MCLGs), including bromodichloromethane. The Metropolitan District Commission implements source protection programs, and the utility recommends certified water filters for vulnerable populations including children, pregnant women, and immunocompromised individuals.