Miamisburg Water Hardness & Quality Report (2026)

Miamisburg, Ohio, in Montgomery County — a Montgomery County city on the Great Miami River immediately southwest of Dayton, home of the former Mound Laboratory (a Department of Energy nuclear weapons component manufacturing facility operated by Monsanto and EG&G — now the Mound Wetlands wildlife area), a historic Ohio river community — receives its municipal water from the City of Miamisburg Water Utility or the Miami Valley Water regional system, drawing from the Great Miami River at the Miamisburg intake.

The moderately hard 143.5 mg/L hardness and TDS of 262.1 mg/L reflect the Great Miami River watershed's Ohio carbonate platform geology. The Great Miami River drains the Western Ohio Till Plain — glaciated terrain underlain by the Silurian Lockport Dolomite (the dominant carbonate formation of western Ohio), the Silurian Niagara Group, and the Devonian Limestone and Columbus Limestone. These Silurian-Devonian carbonate platform rocks produce consistently moderately hard water throughout the Great Miami River valley corridor from Piqua through Dayton-Miamisburg.

At 143.5 mg/L, Miamisburg's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 5.5 ppt warrants a certified drinking water filter — the Mound Laboratory (DOE nuclear facility — significant industrial chemical legacy at the Great Miami River shoreline in Miamisburg), Wright-Patterson Air Force Base (upstream Great Miami-Mad River watershed AFFF user), and the Dayton defense-aerospace corridor contribute to Miamisburg's PFAS readings.