Wallingford Water Hardness & Quality Report (2026)

Wallingford, Connecticut, in South Central Connecticut (New Haven County) — a Wallingford town adjacent to Meriden and North Haven on the Quinnipiac River in the Connecticut Central Valley — receives its municipal water from the Wallingford Electric Division Water or South Central Connecticut Regional Water Authority, drawing from Pond Hill Reservoir and North Farms Reservoir (Quinnipiac watershed, Wallingford).

The moderately hard 100.5 mg/L hardness and TDS of 265.4 mg/L reflect the Connecticut Central Valley Triassic supply. The Quinnipiac River watershed drains the Connecticut Central Valley — Triassic Portland Arkose (calcareous feldspathic sandstone — moderate carbonate contributor), Jurassic Talcott Basalt and Hampden Basalt (insoluble), and the Western Connecticut Highlands (Precambrian schist — insoluble). The Portland Arkose calcareous contribution explains the moderate hardness for a Connecticut surface water supply.

At 100.5 mg/L, Wallingford's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 12.0 ppt is very elevated and warrants a certified reverse osmosis drinking water filter — Bradley International Airport (Hartford County — AFFF), Pratt & Whitney (Hartford County manufacturing — PFAS in the Quinnipiac watershed), and the central Connecticut industrial PFAS complex contribute to Wallingford's very elevated readings.