Mount Vernon Water Hardness & Quality Report (2026)

The Mount Vernon City PWS operates the water utility serving Mount Vernon and surrounding areas in Knox County, Ohio. The system draws from wells in the city well field at Riverside Park and an additional well west of the Kokosing River behind sludge lagoons. The Crestline Water Treatment Plant processes this groundwater supply using disinfection with hypochlorite, filtration, and softening methods. The supply is tied to the Kokosing River watershed within the broader Muskingum River basin.

Water infiltrates the Buried Valley Aquifer, a productive glacial aquifer formed by sand and gravel deposits from ancient river channels. Underlying Devonian bedrock, including carbonate rocks, dissolves into the groundwater, yielding a hard supply with notable mineral content from calcium and magnesium. This geological influence shapes the water's chemistry, contributing to its hardness character observed across central Ohio groundwater sources. The Buried Valley Aquifer's unique geology, with its mix of sand, gravel, and limestone, is responsible for the water's hardness.

If you're dealing with the consequences of hard water, you'll want to take steps to mitigate its effects. Regular vinegar descaling can help reduce mineral buildup in appliances like water heaters and dishwashers. Installing sediment filters and flushing water heaters annually can also help. A whole-house softener is recommended to control hardness-related issues, especially since the utility employs softening but levels remain in the hard range post-treatment. The Mount Vernon City PWS's water quality reports indicate compliance with EPA standards overall, and treatment including disinfection and filtration helps address inorganic contaminants like salts and metals.