Holly Springs Water Hardness & Quality Report (2026)

The Town of Holly Springs Utilities Department serves approximately 45,000 residents in Holly Springs, North Carolina, within Wake County. Water is sourced from purchased surface water, primarily reservoirs in the Neuse River Basin. There are no municipally owned treatment plants; the utility receives pre-treated water from regional sources and applies chlorine dioxide disinfection for final distribution. The department can be reached at 919-577-3150 or PO Box 8, Holly Springs, NC 27540, and serves a growing residential and commercial customer base across the town's service area.

The supply originates in the Neuse River Watershed, spanning the Piedmont physiographic province with Triassic sedimentary bedrock and overlying residuum soils. Key formations include the Chatham Group sandstones and mudstones of the Newark Supergroup, interbedded with diabase intrusions from the Central Atlantic Magmatic Province, which interact with surface runoff to impart a moderately mineralised character. No groundwater aquifers are utilized, so water chemistry reflects basin-wide precipitation, vegetation, and geological leaching from these mixed sedimentary-igneous Triassic Basin formations rather than deep karst or confined flows.

At 40 mg/L, Holly Springs' soft water causes minimal scale buildup in dishwashers, washing machines, and water heaters. Soap lathers readily and spotting on glassware is limited; no water softener is required, though periodic vinegar rinses suffice for light fixture maintenance. Water quality is rated excellent with no EPA violations. Chlorine dioxide is used for disinfection, and trace levels of carbon tetrachloride and perfluorinated compounds have been noted but meet standards. The utility complies fully with lead and copper rules, and testing confirms safety across all measured contaminants.