Lancaster Water Hardness & Quality Report (2026)

Lancaster, Ohio, the Fairfield County seat — the 'Glass City' of central Ohio (Lancaster was one of the world's largest plate glass producing cities in the 19th–early 20th centuries, home of the Anchor Hocking Glass Company, and the birthplace of American glassmaking industry), birthplace of William Tecumseh Sherman (the Union Civil War general — born in Lancaster in 1820) and John Sherman (Sherman Antitrust Act — William T. Sherman's brother), and a major central Ohio manufacturing and historic community — draws its municipal water supply from the Hocking River via the City of Lancaster Water Division. Water hardness in Lancaster measures 182 mg/L — classified as hard.

Lancaster's hard supply reflects the Fairfield County central Ohio Hocking River watershed's highly calcareous geology. The Hocking River at Lancaster drains: the Mississippian Maxville Limestone and Logan Formation (highly calcareous marine limestone and shale of central Ohio); the Devonian Columbus Limestone and Ohio Shale (highly calcareous Delaware Limestone and Columbus Limestone of the Ohio carbonate sequence); and the Wisconsin Age calcareous Till Plain (calcareous glacial deposit from the Erie Lake Basin ice lobe). The highly calcareous central Ohio carbonate sequence and glacial till produce the hard 182 mg/L.

At 182 mg/L, Lancaster residents face regular hard water challenges. Monthly descaling with citric acid solution is standard maintenance. City of Lancaster Water Division consistently delivers water meeting all Ohio EPA and federal EPA Safe Drinking Water Act requirements.