Plum Water Hardness & Quality Report (2026)

The Plum Borough Municipal Authority (PBMA) provides drinking water to approximately 27,000 residents of Plum Borough in Allegheny County, Pennsylvania, across a 20-square-mile area northeast of Pittsburgh. Water sources include groundwater from wells tapping local aquifers and surface water from the Allegheny River, treated at PBMA's own facilities including the Kerr Reservoir and associated treatment plants. The utility reports annually through Consumer Confidence Reports with routine monitoring per federal and state standards, overseen in coordination with Pennsylvania American Water.

The water originates from the Allegheny River watershed, spanning the glaciated Allegheny Plateau with Pennsylvanian-age bedrock of the Conemaugh and Pottsville Groups. Key formations — including Glenshaw limestone, shale, and sandstone aquifers — impart a hard character through dissolution of calcium- and magnesium-bearing minerals from limestone and dolomite. Surface runoff from local reservoirs moderates some variability, but the overall supply retains a pronounced hard profile from prolonged contact with carbonate rocks in this Appalachian plateau setting.

Very hard water in Plum leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, often requiring descaling every 1–2 years. Soap lathering is poor, leaving spots on dishes and skin dryness; fixtures accumulate white deposits. Maintenance includes vinegar soaks for faucets, annual heater flushes, and low-flow aerators. A water softener is strongly recommended for whole-house use to exchange minerals for sodium and protect appliances. PBMA reports full compliance with EPA standards — no lead or copper action level exceedances — with low disinfectant byproducts per the 2022 CCR; treatment involves coagulation, sedimentation, filtration, chlorination, and fluoride addition.