Hard water in Nicholasville, KY
County estimate from 50 water samples in Jessamine County · July 2026
- KY typical
- 134 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Nicholasville put hardness at about 160 mg/L (9.3 gpg), which would be hard on the USGS scale. Treat this as a rough guide: it is the median of 50 samples taken across Jessamine County, mostly wells and streams, not a test of Nicholasville's treated tap water. One more reason for caution: EPA lists Nicholasville's water system as using surface water, which is often softer than the wells behind the county figure.
Nicholasville sits 26 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 160 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 160 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 × 9.3 gpg = 2,099 grains a day. A 24,000-grain unit regenerates about every 11 days.
EPA record for Nicholasville's water system
1 health-based violation since 2016
Serves about 35,266 people from surface water.
- Health-based
- 1
- Monitoring or reporting
- 5
- Open now
- 0
EPA lists this system as serving Nicholasville.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Total Coliform Rulebacteria | 1 | 2018 | Resolved |
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 Nicholasville water hard?
Yes. It measures about 160 mg/L (9.3 grains per gallon), which the USGS classes as hard.
What is the water hardness in Nicholasville in grains per gallon?
About 9.3 gpg. One grain per gallon equals 17.1 mg/L, so 160 mg/L divided by 17.1 gives 9.3.
What size water softener do I need in Nicholasville?
For 3 people using 75 gallons each per day, 9.3 gpg works out to about 2,099 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.
Has the Nicholasville water system had EPA violations?
EPA records show 1 health-based violation for Nicholasville Water Department since 2016, involving Total Coliform Rule. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Lexington158 mg/LHard
- Richmond186 mg/LVery hard
- Frankfort199 mg/LVery hard
- Paris144 mg/LHard
- Louisville134 mg/LHard
- St. Matthews134 mg/LHard
- Walton110 mg/LModerately hard
- Elizabethtown186 mg/LVery hard
- Union70 mg/LModerately hard
- Independence110 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.