Hard water in Lexington, KY
Reported by Kentucky-American Water CO · October 2025
- KY typical
- 134 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Lexington has about 158 mg/L of hardness, which is 9.2 grains per gallon. On the USGS scale that counts as hard. The number comes from Kentucky-American Water CO, dated October 2025.
Lexington sits 24 mg/L above the typical Kentucky figure of 134. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 70 mg/L in Union to 199 in Frankfort.
What 158 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 158 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 9.2 gpg = 2,077 grains a day. A 24,000-grain unit regenerates about every 11 days.
EPA record for Lexington's water system
No health-based violations since 2016
Serves about 669,042 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Lexington water hard?
Yes. It measures about 158 mg/L (9.2 grains per gallon), which the USGS classes as hard.
What is the water hardness in Lexington in grains per gallon?
About 9.2 gpg. One grain per gallon equals 17.1 mg/L, so 158 mg/L divided by 17.1 gives 9.2.
What size water softener do I need in Lexington?
For 3 people using 75 gallons each per day, 9.2 gpg works out to about 2,077 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.
Has the Lexington water system had EPA violations?
EPA records show no health-based violations for Kentucky-American Water CO since 2016.
Nearby cities
- Nicholasville160 mg/LHard
- Paris144 mg/LHard
- Richmond186 mg/LVery hard
- Frankfort199 mg/LVery hard
- Walton110 mg/LModerately hard
- Independence110 mg/LModerately hard
- Union70 mg/LModerately hard
- Alexandria110 mg/LModerately hard
- Louisville134 mg/LHard
- St. Matthews134 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, October 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.