How hard is the water in Oakbrook, KY?

Tap water hardness
70mg/L
4.1gpg
Moderately hard

Reported by Boone CO Water & Sewer District · October 2024

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

The water in Oakbrook carries roughly 70 mg/L of dissolved calcium and magnesium, or 4.1 grains per gallon. That is moderately hard water. The number comes from Boone CO Water & Sewer District, dated October 2024.

Oakbrook on the hardness scale, with nearby cities
060120180240300360+KY typical 134Florence: 70 mg/LFlorence 70Burlington: 70 mg/LBurlington 70Union: 70 mg/LUnion 70Hebron: 70 mg/LHebron 70Elsmere: 110 mg/LElsmere 110Erlanger: 110 mg/LErlanger 110Villa Hills: 110 mg/LVilla Hills 110Edgewood: 110 mg/LEdgewood 110Fort Mitchell: 110 mg/LFort Mitchell 110Independence: 110 mg/LIndependence 110Oakbrook 70mg/L as calcium carbonate060120180240300360+KY 134Florence: 70 mg/LFlorence 70Burlington: 70 mg/LBurlington 70Union: 70 mg/LUnion 70Hebron: 70 mg/LHebron 70Elsmere: 110 mg/LElsmere 110Erlanger: 110 mg/LErlanger 11070 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 70 mg/L, Oakbrook is 64 mg/L below the typical Kentucky figure of 134. None of the 10 nearest cities we track has softer water. The range nearby runs from 70 mg/L in Florence to 110 in Elsmere.

What 70 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 Oakbrook

3 people × 75 gallons a day × 4.1 gpg = 922 grains a day. A 24,000-grain unit regenerates about every 26 days.

Size it for your household

EPA record for Oakbrook's water system

Boone CO Water & Sewer District · PWSID KY0080034

No health-based violations since 2016

Serves about 66,300 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Oakbrook to this system. EPA's service-area records do not name Oakbrook, 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 Oakbrook water hard?

Somewhat. It measures about 70 mg/L (4.1 grains per gallon), which the USGS classes as moderately hard.

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

About 4.1 gpg. One grain per gallon equals 17.1 mg/L, so 70 mg/L divided by 17.1 gives 4.1.

What size water softener do I need in Oakbrook?

For 3 people using 75 gallons each per day, 4.1 gpg works out to about 922 grains a day. A 24,000-grain softener covers that with a regeneration about every 26 days.

Has the Oakbrook water system had EPA violations?

EPA records show no health-based violations for Boone CO Water & Sewer District since 2016.

Nearby cities

All 37 cities in Kentucky

Hardness data: TapWaterData US Water Hardness (utility report, October 1, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.