Fullerton Water Hardness & Quality Report (2026)

Fullerton, Pennsylvania, in Lehigh County — an unincorporated Lehigh County community adjacent to Allentown and Whitehall on the Lehigh River in east Pennsylvania — receives its water from the Lehigh County Authority, drawing from the Lehigh River and local Lehigh Valley limestone aquifer (Lehigh County) through the east Pennsylvania distribution.

The very hard 207 mg/L hardness and TDS of 533.5 mg/L reflect the east Pennsylvania Lehigh Valley supply's intense Ridge and Valley calcareous character — consistent with other Lehigh Valley communities (Allentown: ~210 mg/L; Bethlehem: ~205 mg/L). The Lehigh River at Lehigh County drains the Ridge and Valley — Ordovician Jacksonburg Limestone (calcareous — primary hardness contributor), Cambrian Allentown Dolomite (dolomite — primary TDS contributor), and Cambrian Leithsville Formation (dolomite — secondary contributor). The Ordovician limestone and Cambrian dolomite dissolution produces the very hard Lehigh Valley supply.

At 207 mg/L with TDS 534, Fullerton's water is very hard. A water softener is strongly recommended. Scale builds rapidly on all surfaces, appliance lifespans are significantly shortened, and water heaters require annual descaling without softening. The PFAS level of 10.7 ppt is very high — Naval Air Station Willow Grove (Montgomery County — AFFF, major southeast Pennsylvania PFAS source), the east Pennsylvania industrial corridor, and the Lehigh River PFAS background contribute to Fullerton's very elevated readings.