How hard is the water in Moline, IL?

Tap water hardness
110mg/L
6.4gpg
Moderately hard

Reported by Moline · September 2022

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

Moline water measures 110 mg/L (6.4 gpg) of hardness, moderately hard by USGS standards. The number comes from Moline, dated September 2022.

Moline on the hardness scale, with nearby cities
060120180240300360+IL typical 139Kewanee: 54 mg/LKewanee 54Sterling: 172 mg/LSterling 172Monmouth: 175 mg/LMonmouth 175East Moline: 192 mg/LEast Moline 192Silvis: 212 mg/LSilvis 212Peoria: 272 mg/LPeoria 272Bartonville: 283 mg/LBartonville 283Galesburg: 331 mg/LGalesburg 331Freeport: 350 mg/LFreeport 350Canton: 401 mg/LCanton 401Moline 110mg/L as calcium carbonate060120180240300360+IL 139Kewanee: 54 mg/LKewanee 54Sterling: 172 mg/LSterling 172Monmouth: 175 mg/LMonmouth 175East Moline: 192 mg/LEast Moline 192Silvis: 212 mg/LSilvis 212Galesburg: 331 mg/LGalesburg 331110 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Moline sits 29 mg/L below the typical Illinois figure of 139. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 54 mg/L in Kewanee to 401 in Canton.

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 Moline

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 Moline's water system

Moline · PWSID IL1610450

No health-based violations since 2016

Serves about 44,500 people from surface water.

Health-based
0
Monitoring or reporting
2
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 Moline 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 Moline 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 Moline?

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 Moline water system had EPA violations?

EPA records show no health-based violations for Moline since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 192 cities in Illinois

Hardness data: TapWaterData US Water Hardness (utility report, September 27, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.