Reading Water Hardness & Quality Report (2026)

Reading, Pennsylvania — the Berks County seat in the Schuylkill Valley — draws its municipal water supply from the Schuylkill River via the Reading Area Water Authority (RAWA), operating a raw water intake on the Schuylkill River in Berks County. The Schuylkill River at Reading has drained the northeastern Pennsylvania anthracite region and the Great Valley carbonate zone above the city. Water hardness measures 153 mg/L — classified as hard.

Reading's hard supply reflects the Schuylkill River's significant carbonate mineral accumulation at the Berks County reach. The Schuylkill River watershed above Reading includes: the Pennsylvania Great Valley (South Mountain zone — Cambrian Chickies Quartzite and Ordovician carbonate thrust sheets, Silurian Juniata Formation); the Appalachian anthracite region (Pennsylvanian Pottsville Conglomerate and anthracite coal measures — acidic drainage partially offset by downstream neutralisation); and the Great Valley carbonate formation (the Cambrian–Ordovician Great Valley limestone and dolomite belt, part of the Appalachian Valley and Ridge calcareous zone). The Valley and Ridge limestone belt's drainage significantly contributes dissolved calcium, producing the moderately hard to hard supply at Reading's Schuylkill intake.

At 153 mg/L, Reading residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. Dishwashers require rinse-aid, and water heaters benefit from annual inspection. Reading Area Water Authority consistently delivers water meeting all Pennsylvania DEP and EPA Safe Drinking Water Act requirements.