Winchester Water Hardness & Quality Report (2026)

The City of Winchester Utilities Department supplies drinking water to the city of Winchester in Frederick County, Virginia, serving approximately 28,000 residents within the corporate limits and adjacent areas. The sole water source is surface water from the North Fork Shenandoah River, treated at the Percy Miller Water Treatment Plant through coagulation, sedimentation, filtration, and disinfection processes. Two booster pump stations support distribution throughout the service area, and the utility maintains rigorous monitoring in compliance with state and federal drinking water standards.

The North Fork Shenandoah River drains the Shenandoah Valley watershed, characterized by folded Appalachian sedimentary rocks dominated by Paleozoic limestones, dolomites, and shales, including the Keyser and Helderberg groups. These carbonate formations naturally impart elevated mineral content, yielding a very hard supply. Karst features in the limestone bedrock facilitate groundwater-surface water interactions, further elevating hardness levels compared to softer Appalachian streams.

Very hard water promotes significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan and potentially causing costly damage from clogs and repairs. Fixtures develop stubborn stains, and soap lathering is inefficient, increasing detergent use. Regular deliming, installing scale inhibitors, and flushing systems are advised; a water softener is strongly recommended to mitigate these effects and protect plumbing. The 2023 Annual Drinking Water Quality Report confirms full compliance with all EPA standards; PFAS sampling showed non-detect levels, well below proposed EPA MCLs.