Cave Spring Water Hardness & Quality Report (2026)

Cave Spring, Virginia, in Roanoke County southwest of Roanoke, receives its municipal water from the Western Virginia Water Authority (WVWA), which draws from Spring Hollow Reservoir — a modern impoundment on the North Fork of the Roanoke River — and Carvins Cove Reservoir in the Brushy Mountain ridge system. WVWA treats and distributes water throughout Roanoke County, the City of Roanoke, and surrounding communities. Cave Spring lies in the southern Roanoke Valley — a broad agricultural valley in the Valley and Ridge Province of the Appalachians historically known for its extensive cavern and karst development.

The hard 156.5 mg/L hardness reflects the Valley and Ridge Province's characteristic carbonate geology. The Roanoke Valley sits within the Great Valley — a continuous carbonate-floored valley stretching from Canada to Alabama — underlain by Cambrian and Ordovician limestones and dolomites including the Elbrook Formation, Copper Ridge Dolomite, and Beekmantown Group. The North Fork Roanoke River and tributaries drain terrain where these carbonate rocks are exposed or thinly mantled, contributing calcium and magnesium bicarbonates to stream flow and reservoir water throughout the watershed.

At 156.5 mg/L, Cave Spring residents experience hard water with consistent mineral effects throughout the home. Kettles and coffee machines accumulate white scale over weeks of regular use, dishwashers leave mineral film on glassware, and bathroom fixtures develop calcium deposits requiring regular cleaning. The famous Roanoke Valley carbonate karst that gives the community its name — abundant springs and cave systems throughout the area — reflects precisely the dissolution chemistry responsible for the hard water. Descaling appliances every two months is the practical recommendation. The PFAS level of 8.2 ppt is elevated, likely reflecting military and manufacturing activity in the Roanoke corridor — a certified drinking water filter is advisable for daily use.