Mount Holly Water Hardness & Quality Report (2026)

The City of Mount Holly Public Works Department provides water for about 6,000 residents in Mount Holly and surrounding Gaston County, North Carolina. Their supply comes from a mix of surface water drawn from the Catawba River and local groundwater wells. This water is then processed at the city's own water treatment plant. The utility taps into the Catawba River Basin, with water intake points managed alongside regional partners like the City of Gastonia. The Mount Holly system includes storage reservoirs and advanced filtration technology to serve the town and nearby unincorporated areas.

The water originates in the Catawba River Basin, which stretches across the Blue Ridge and Piedmont regions. Upstream, Mount Holly's supply is influenced by reservoirs such as Lake Wylie and Lake Norman. The geology here features ancient metamorphic rocks like gneisses and schists, giving way to Triassic basin sediments and igneous intrusions in the Piedmont. Groundwater comes from fractured bedrock aquifers in these crystalline rocks, typically holding low mineral content because there's little limestone or dolomite. This results in a soft water supply.

Homeowners in Mount Holly will likely notice minimal scale buildup on faucets and showerheads, which helps extend the lifespan of appliances like water heaters and dishwashers. You'll find that soap lathers easily, potentially reducing the amount of detergent needed for laundry and dishes. While a water softener isn't necessary, it's wise to check the anode rod in your water heater annually and use pH-balanced cleaners for any occasional spotting. The City of Mount Holly Public Works Department ensures the water meets all federal and state safety standards, including keeping disinfection byproducts and trace nitrates well below regulated levels.