Newport News Water Hardness & Quality Report (2026)

Newport News, Virginia draws its municipal water supply from Newport News Waterworks, which operates three surface water reservoirs on the Virginia Peninsula in Newport News and James City Counties: Harwoods Mill Reservoir and Lee Hall Reservoir on the Warwick River, and the large Diascund Creek Reservoir further inland. These protected reservoir systems collectively form one of the largest municipal water storage systems in eastern Virginia. Raw water is treated at the James River Treatment Plant and the Anderson Treatment Plant before distribution throughout Newport News. Water hardness measures 103 mg/L — classified as moderately hard.

Newport News's moderate hardness reflects the geology of its Coastal Plain reservoir catchments on the Virginia Peninsula. The Warwick River and Diascund Creek drainages traverse Cretaceous Potomac Group sediments — alternating beds of quartz sand, kaolinite clay, and occasional calcareous sand layers deposited in ancient river delta and shallow marine environments. While dominated by calcium-poor quartz and clay, the Potomac Group contains localised calcareous layers that contribute modest dissolved calcium to surface runoff. The relatively young sedimentary terrain produces a moderately hard supply — firmer than pure quartzite drainages but softer than Appalachian carbonate systems.

With hardness at 103 mg/L, Newport News residents encounter moderate scale accumulation over time. Faucet aerators and showerheads develop light to moderate deposits over several months — quarterly cleaning with citric acid solution is a practical maintenance habit. Dishwashers produce cleaner glassware results with standard rinse-aid, and water heaters benefit from an annual inspection to address any element scale build-up. Newport News Waterworks has won multiple regional water quality awards and consistently delivers EPA-compliant water throughout the city's distribution network.