Fremont Water Hardness & Quality Report (2026)

Fremont, Ohio, in Sandusky County — the Sandusky County seat adjacent to Clyde and Green Springs on the Sandusky River in northwest Ohio — receives its municipal water from the Fremont Water Division, drawing from the Sandusky River (Sandusky County) through the Fremont treatment plant.

The moderately hard 124 mg/L hardness and TDS of 208.4 mg/L reflect the northwest Ohio Sandusky River's moderate carbonate character — softer than the Lake Erie-fed Cleveland communities (Hough: 141.5 mg/L; Fairview Park: 189 mg/L) due to the Sandusky River's more mixed agricultural and glacial outwash headwaters. The Sandusky River at Sandusky County drains the Ohio Till Plain — Silurian Lockport Dolomite (beneath the outwash — primary carbonate source), Devonian Columbus Limestone (calcareous), and calcareous Pleistocene Erie Lobe till. The glacial outwash and dolomite bedrock produces the moderately hard northwest Ohio supply.

At 124 mg/L, Fremont'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 4.8 ppt warrants a certified drinking water filter — the Sandusky County northwest Ohio agricultural corridor and the Ohio PFAS background from the Great Lakes industrial complex contribute to Fremont's readings.