Oxford Water Hardness & Quality Report (2026)

Oxford, Ohio, in Butler County — home to Miami University, one of Ohio's oldest and most distinguished public universities, in the scenic rolling farmland of the southwest Ohio Devonian limestone upland — receives its municipal water from the City of Oxford Water Division, which draws from the Great Miami River watershed through local reservoir infrastructure or from Acclivity Creek impoundments. Oxford's water supply reflects the characteristic carbonate chemistry of the Butler County Great Miami drainage basin.

The moderately hard 143 mg/L hardness and TDS of 260.7 mg/L reflect the Great Miami River watershed's Devonian carbonate geology in Butler County. The Great Miami River drains southwest Ohio's Devonian Columbus Limestone and Delaware Limestone — ancient Devonian marine carbonate formations with prolific spring baseflow from the regional Devonian aquifer. The underlying Silurian Niagara Dolomite and Richmond Formation also contribute carbonate baseflow to the Great Miami through deep spring discharge. Butler County sits on this classic southwest Ohio Devonian-Silurian carbonate platform, and all surface and groundwater supplies in the region carry the moderate carbonate hardness characteristic of the Ohio carbonate belt.

At 143 mg/L, Oxford's water is moderately hard — the standard southwest Ohio Devonian carbonate supply profile. Scale builds in kettles and coffee machines over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is the standard schedule for Butler County communities. The PFAS level of 5.5 ppt warrants a certified drinking water filter — Butler County's greater Cincinnati suburban industrial corridor, the Great Miami River valley's manufacturing heritage, and the broader southwest Ohio PFAS background from Dayton-area 3M and manufacturing legacy sources contribute to the Oxford-area water supply.