Hard water in Henderson, KY
County estimate from 168 water samples in Henderson County · July 2026
- KY typical
- 134 mg/L
- EPA health violations since 2016
- 2
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Henderson put hardness at about 198 mg/L (11.6 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 168 samples taken across Henderson County, mostly wells and streams, not a test of Henderson's treated tap water. One more reason for caution: EPA lists Henderson's water system as using surface water, which is often softer than the wells behind the county figure.
Henderson sits 64 mg/L above the typical Kentucky figure of 134. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 63 mg/L in Paducah to 199 in Frankfort.
What 198 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
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 198 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 × 11.6 gpg = 2,606 grains a day. A 24,000-grain unit regenerates about every 9 days.
EPA record for Henderson's water system
2 health-based violations since 2016
Serves about 17,447 people from surface water.
- Health-based
- 2
- Monitoring or reporting
- 6
- Open now
- 0
EPA lists this system as serving Henderson.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Haloacetic acids (HAA5)a disinfection byproduct | 2 | 2016 | 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 Henderson water hard?
Yes. It measures about 198 mg/L (11.6 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Henderson in grains per gallon?
About 11.6 gpg. One grain per gallon equals 17.1 mg/L, so 198 mg/L divided by 17.1 gives 11.6.
What size water softener do I need in Henderson?
For 3 people using 75 gallons each per day, 11.6 gpg works out to about 2,606 grains a day. A 24,000-grain softener covers that with a regeneration about every 9 days.
Has the Henderson water system had EPA violations?
EPA records show 2 health-based violations for Henderson County Water District since 2016, involving Haloacetic acids (HAA5). There were also 6 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Owensboro116 mg/LModerately hard
- Hopkinsville86 mg/LModerately hard
- Paducah63 mg/LModerately hard
- Bowling Green135 mg/LHard
- Radcliff186 mg/LVery hard
- Elizabethtown186 mg/LVery hard
- Louisville134 mg/LHard
- St. Matthews134 mg/LHard
- Frankfort199 mg/LVery hard
- Nicholasville160 mg/LHard
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.