Paducah Water Hardness & Quality Report (2026)

Paducah, Kentucky, in McCracken County at the confluence of the Ohio River and Tennessee River at the western tip of Kentucky, receives its municipal water from the Paducah Water Works, which draws directly from the Ohio River via an intake in the lower Ohio River reach above the Tennessee River confluence. The Ohio River at Paducah drains a vast continental watershed spanning the Appalachian Plateau, Interior Low Plateaus, Illinois Basin, and Central Lowlands — a complex catchment of over 200,000 square miles carrying the integrated mineral signature of the entire upper Ohio River basin.

The moderately hard 117.5 mg/L hardness reflects the Ohio River's diluted carbonate character at the lower river reach. The upper Ohio and its major tributaries — the Allegheny, Monongahela, Kanawha, Green, Cumberland, and Tennessee Rivers — drain a mix of Mississippian limestone and dolomite from the Interior Low Plateaus, Pennsylvanian coalfield shales from the Appalachian Plateau, and siliceous Appalachian Mountain crystalline terrain. The overall mineral signature averages to moderate hardness by the time the river reaches Paducah, softened from the higher values seen upstream in the Ohio carbonate plateau reaches.

At 117.5 mg/L, Paducah's water is moderately hard — comfortable for everyday household use. Scale forms gradually in kettles and water heaters over months, soap lathers adequately, and glassware from the dishwasher shows light occasional spotting. Quarterly descaling is sufficient for most appliances. The Ohio River's complex industrial legacy in the Paducah area — historically home to the Paducah Gaseous Diffusion Plant (uranium enrichment facility) — has made water quality monitoring a priority for the city. The PFAS level of 4.3 ppt is moderate, and the drinking water treatment plant applies comprehensive monitoring protocols, though a certified point-of-use filter provides additional security.