Jeffersonville Water Hardness & Quality Report (2026)

Jeffersonville, Indiana, the Clark County seat on the Ohio River across from Louisville, Kentucky — the oldest city in Indiana, a major historic Ohio River port city, now a growing Louisville metro north suburb, home of the Howard Steamboat Museum (honoring the Howard Shipyard, which built more Ohio River steamboats than any other yard), the Big Four Bridge pedestrian/bicycle crossing to Louisville, and a revitalized downtown riverfront — draws its municipal water supply from the Ohio River via the Ohio Valley Water Company (OVWC). Water hardness in Jeffersonville measures 133 mg/L — classified as moderately hard.

Jeffersonville's moderate hardness reflects the Ohio River's calcareous Indiana–Kentucky Paleozoic platform characteristics. The Ohio River at Jeffersonville–Louisville receives drainage from the Devonian–Silurian calcareous Ohio River Valley — the Devonian Louisville Limestone (highly calcareous dolomitic limestone, the Louisville metro's principal Paleozoic formation) and the Silurian Niagara Dolomite (calcareous dolomite of the upper Ohio River Valley). Ohio Valley Water Company treats the Ohio River supply effectively at Jeffersonville, producing the moderate 133 mg/L — typical for the south Indiana–Louisville metro zone.

At 133 mg/L, Jeffersonville residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Ohio Valley Water Company consistently delivers water meeting all Indiana IDEM and EPA Safe Drinking Water Act requirements.