Summerville Water Hardness & Quality Report (2026)

Summerville, South Carolina, the Dorchester County seat northwest of Charleston — the 'Flower Town in the Pines,' one of the fastest-growing cities in the United States, a rapidly expanding Charleston metro suburban community known for its azalea gardens (the Flowertown Festival), historic downtown, and a booming residential development corridor — draws its municipal water supply from the Middendorf Aquifer and Black Creek Aquifer (Upper Cretaceous) via the Town of Summerville Public Works Water Division. Water hardness in Summerville measures 74 mg/L — classified as moderately soft.

Summerville's moderate softness reflects the South Carolina Coastal Plain's calcareous-poor Cretaceous sand aquifer. The Middendorf Aquifer (Upper Cretaceous Middendorf Formation — a clean quartz sand aquifer of the Atlantic Coastal Plain, one of the principal drinking water aquifers of the South Carolina Coastal Plain) is a high-quality, calcium-poor siliceous sandstone with minimal calcareous cement. The Cretaceous Middendorf sand has very low dissolved mineral content from the calcium-poor quartz sand matrix. The Black Creek Aquifer (Cretaceous Black Creek Formation — similar clean quartz sand) provides a similarly soft supplemental source, producing the moderate 74 mg/L at Summerville.

With hardness at 74 mg/L, Summerville residents enjoy moderately soft water with minimal scale challenges. Town of Summerville Public Works Water Division consistently delivers water meeting all South Carolina DHEC and EPA Safe Drinking Water Act requirements.