How hard is the water in Erlanger, KY?

Tap water hardness
110mg/L
6.4gpg
Moderately hard

Reported by Northern Kentucky Water District · September 2025

KY typical
134 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

The water in Erlanger carries roughly 110 mg/L of dissolved calcium and magnesium, or 6.4 grains per gallon. That is moderately hard water. The number comes from Northern Kentucky Water District, dated September 2025.

Erlanger on the hardness scale, with nearby cities
060120180240300360+KY typical 134Florence: 70 mg/LFlorence 70Oakbrook: 70 mg/LOakbrook 70Hebron: 70 mg/LHebron 70Villa Hills: 110 mg/LVilla Hills 110Fort Mitchell: 110 mg/LFort Mitchell 110Edgewood: 110 mg/LEdgewood 110Elsmere: 110 mg/LElsmere 110Fort Wright: 110 mg/LFort Wright 110Covington: 110 mg/LCovington 110Taylor Mill: 110 mg/LTaylor Mill 110Erlanger 110mg/L as calcium carbonate060120180240300360+KY 134Florence: 70 mg/LFlorence 70Villa Hills: 110 mg/LVilla Hills 110Fort Mitchell: 110 mg/LFort Mitch. 110Edgewood: 110 mg/LEdgewood 110Elsmere: 110 mg/LElsmere 110Fort Wright: 110 mg/LFort Wright 110110 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Erlanger sits 24 mg/L below the typical Kentucky figure of 134. None of the 10 nearest cities we track has harder water. The range nearby runs from 70 mg/L in Florence to 110 in Villa Hills.

What 110 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Erlanger

3 people × 75 gallons a day × 6.4 gpg = 1,447 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Erlanger's water system

Northern Kentucky Water District · PWSID KY0590220

No health-based violations since 2016

Serves about 259,949 people from surface water.

Health-based
0
Monitoring or reporting
1
Open now
0

TapWaterData ties Erlanger to this system. EPA's service-area records do not name Erlanger, so check the utility printed on your water bill.

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 Erlanger water hard?

Somewhat. It measures about 110 mg/L (6.4 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Erlanger in grains per gallon?

About 6.4 gpg. One grain per gallon equals 17.1 mg/L, so 110 mg/L divided by 17.1 gives 6.4.

What size water softener do I need in Erlanger?

For 3 people using 75 gallons each per day, 6.4 gpg works out to about 1,447 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Erlanger water system had EPA violations?

EPA records show no health-based violations for Northern Kentucky Water District since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 37 cities in Kentucky

Hardness data: TapWaterData US Water Hardness (utility report, September 9, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.