Ok, I’m pretty sure I found it: Hardness: Louisville pure tap®, Louisville Water Company's tap water, is moderately hard, at 159 mg/L or 9.3 grains of calcium carbonate per gallon.
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Looking at your state on the hardness map you look to be in an area of 3.5-7.0 grains per gallon. Louisville is in a higher areaOk, I’m pretty sure I found it: Hardness: Louisville pure tap®, Louisville Water Company's tap water, is moderately hard, at 159 mg/L or 9.3 grains of calcium carbonate per gallon.