Alliance Water Hardness & Quality Report (2026)

Alliance, Ohio, in Stark County — a proud northeastern Ohio city with deep steel manufacturing heritage, home to the Carnation Company cannery and Alliance Castings, near the Stark County border with Mahoning and Portage counties — receives its municipal water from the Alliance Water Works or through purchase from the Stark County regional system, which draws from the Mahoning River or Lake Milton reservoir. The Mahoning River corridor provides water to multiple northeastern Ohio communities through a regional watershed supply network.

The moderately hard 168.5 mg/L hardness and TDS of 339.7 mg/L reflect the Mahoning River watershed's Devonian carbonate character in the northeastern Ohio plateau. The Mahoning River originates in Portage County and flows through Trumbull County into the Mahoning Valley of northeastern Ohio — draining the Devonian Columbus Limestone, Ohio Shale, and Berea Sandstone carbonate and calcareous shale sequence of the northeastern Ohio Devonian platform. The Mahoning watershed's spring-fed Devonian carbonate baseflow maintains consistently moderate carbonate hardness throughout the year, producing a reliably hard river supply for the Stark-Mahoning County communities.

At 168.5 mg/L, Alliance's water is moderately hard — consistent with the northeastern Ohio Mahoning Valley supply profile. Scale builds in kettles and coffee machines over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling of heating appliances is the standard schedule. The PFAS level of 6.6 ppt warrants a certified drinking water filter — the Mahoning Valley's industrial steel, chemicals, and manufacturing heritage (the Youngstown-Warren-Boardman corridor's legacy steel industry), combined with the northeast Ohio industrial supply chain, contributes to PFAS levels in the Alliance-area water supply.