Spring Hill Water Hardness & Quality Report (2026)

Spring Hill, Tennessee, in Williamson and Maury Counties — a major south Nashville suburban community (Spring Hill is one of the fastest-growing cities in Tennessee — a rapidly expanding Williamson County suburban community in the booming Nashville south metro), home of the General Motors Saturn Plant (the Spring Hill Saturn assembly plant was the home of Saturn Corporation from 1990–2010 — one of the major General Motors manufacturing facilities in the southeast US, now producing Chevrolet Equinox; the Spring Hill GM complex is one of the largest automotive manufacturing operations in Tennessee), a diverse Williamson County community with a significant middle-class and professional population, and adjacent to Columbia in the rapidly developing I-65 south Nashville corridor — draws its municipal water supply from the Duck River via the City of Spring Hill Water Division. Water hardness in Spring Hill measures 89.5 mg/L — classified as moderately soft.

Spring Hill's moderate softness — softer than nearby Columbia (198 mg/L) — reflects effective treatment of the Duck River supply in the Spring Hill distribution zone. The Duck River at Spring Hill–Williamson County shares the same calcareous Maury County Paleozoic carbonate watershed (Knox Dolomite, Salem Limestone). Spring Hill's newer distribution infrastructure and treatment system (primarily post-2000 development mains) produces the softer 89.5 mg/L compared to older central Maury County communities.

With hardness at 89.5 mg/L, Spring Hill residents enjoy moderately soft water. City of Spring Hill Water Division consistently delivers water meeting all Tennessee TDEC and EPA Safe Drinking Water Act requirements.