Madison Water Hardness & Quality Report (2026)

Madison, Alabama, in Madison County west of Huntsville — a fast-growing suburban city adjacent to Huntsville (Rocket City, USA), one of Alabama's fastest-growing communities, a major aerospace and defense community with significant Boeing, Lockheed Martin, and NASA Marshall Space Flight Center–related workforce, and a highly educated professional community serving the US Army's Redstone Arsenal complex — draws its municipal water supply from the Tennessee River (Wheeler Reservoir) via the City of Madison Water and Sewer Board. Water hardness in Madison measures 69.5 mg/L — classified as moderately soft.

Madison's moderate softness — softer than Huntsville (76 mg/L) on the same Wheeler Reservoir supply — reflects the TVA (Tennessee Valley Authority) Wheeler Reservoir characteristics and the Madison Water and Sewer Board treatment effectiveness. The Wheeler Reservoir (TVA) on the Tennessee River below Wilson Dam collects water primarily from the Tennessee Valley watershed — including the Ordovician–Silurian calcareous terrain of the Valley and Ridge Province. TVA's Wheeler Reservoir and the Madison Water treatment produces very effective calcium removal, delivering the moderate 69.5 mg/L — one of the softer supplies in north Alabama.

With hardness at 69.5 mg/L, Madison residents enjoy moderately soft water with minimal scale challenges. City of Madison Water and Sewer Board consistently delivers water meeting all Alabama ADEM and EPA Safe Drinking Water Act requirements.