Louisville, KY water hardness

Louisville's tap water measures 128 ppm, which is hard. The number comes from Louisville Water Company's 2025 published data, measured at the tap.

Score

128 ppm

Hard

Louisville shower water

Hardness bands per the U.S. Geological Survey.

128

Soft
0–60

Moderately hard
61–120

Hard
121–180

Very hard
181+

Source: Louisville Water Company, 2025.

For comparison, Fresno, CA sits in the same range at 129 ppm.

What this means

What Louisville Water Means for Hair and Skin

Between 121 and 180 ppm, buildup shows up over weeks rather than days: spotted glass, crusted showerheads, and shampoo that never quite rinses clean.

What removes it

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Water tests soft on a standard hardness strip

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