Madisonville Water Hardness & Quality Report (2026)

Madisonville Light & Water, operated by the City of Madisonville, serves approximately 28,102 people in Hopkins County, Kentucky (ZIP 42431), with additional supply to the North Hopkins Water District (3,725 people). The primary source is surface water from Lake Peewee, treated at the Madisonville Water Filtration Plant at 850 Lake Peewee Road. This facility produces up to 4.5 million gallons per day (expandable to 8 million) and provides 24/7 standby service. The utility can be reached at 270-824-2145; Superintendent Alan Todd oversees operations.

Lake Peewee lies within the Tradewater River watershed in Kentucky's Western Coal Field physiographic province. Pennsylvanian sedimentary rocks — including limestone, sandstone, and shale from the Pottsville Escarpment and Caseyville Formation — dominate the geology. These carbonate-rich layers promote mineral dissolution, yielding a hard supply prone to elevated calcium and magnesium. Karst features and agricultural runoff from the surrounding low plateaus further shape the water's moderately mineralised character, influencing treatment requirements at the filtration plant.

Hard water in Madisonville leads to scale buildup in pipes, water heaters, dishwashers, and washing machines, with up to 20–30% higher energy use in affected appliances. Showers feel less soapy and laundry can appear dingy. Monthly vinegar descaling for showerheads and faucets, annual water heater flushes, and low-flow aerators help mitigate issues. A whole-house water softener is recommended for households noticing spots on dishes or dry skin and hair. The 2023 Consumer Confidence Report (Water System ID: KY0540936) confirms compliance with all EPA MCLs for 102+ contaminants; treatment involves conventional filtration and disinfection of surface water, with no violations noted.