Frankfort Water Hardness & Quality Report (2026)

The Frankfort Water Works Department serves the city of Frankfort in Clinton County, Indiana, providing drinking water to approximately 16,000 residents across the city and surrounding areas. The utility sources its supply entirely from groundwater wells tapping local aquifers beneath the city, with no surface water sources utilized. Treatment occurs at the Frankfort Water Treatment Plant, where raw groundwater undergoes filtration, disinfection with chlorine, and pH adjustment before distribution. The utility maintains an excellent compliance record, with only 1 monitoring-related violation noted since 2023.

Frankfort's groundwater originates from confined aquifers within the glacial drift and bedrock of central Indiana, part of the broader Teays-Mahomet buried valley aquifer system. The local geology features Paleozoic carbonate formations including Devonian and Silurian limestones and dolomites, as well as the Silurian Salina Group. These soluble rocks dissolve over time through natural mineral leaching as groundwater flows through fractures and porous media, imparting a hard character. Glacial deposits overlay these formations, creating a mixed hydrogeologic environment without significant surface softening.

At hard water levels, scale buildup from calcium and magnesium deposits affects water heaters, dishwashers, washing machines, and faucets, reducing efficiency and lifespan. Soap lathering is diminished, leading to higher detergent use and spotted dishes. Recommended maintenance includes vinegar descaling of fixtures, installing drain screens, and flushing water heaters annually; a water softener is strongly recommended. Treatment includes aeration for iron/manganese removal, sedimentation, dual-media filtration, chlorination, and fluoride addition; pH is typically adjusted to 7.5–8.5. Lead and copper compliance is maintained through corrosion control measures.