Hard water in Pekin, IL
Reported by IL American-Pekin · June 2022
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- Utility report
Pekin water measures 361 mg/L (21.1 gpg) of hardness, very hard by USGS standards. The number comes from IL American-Pekin, dated June 2022. Reports for this system disagree, with values from 361 to 551 mg/L.
Pekin sits 222 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 8 have softer water and 1 has harder. The range nearby runs from 89 mg/L in Bloomington to 401 in Canton.
What 361 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 361 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 × 21.1 gpg = 4,752 grains a day. A 48,000-grain unit regenerates about every 10 days.
EPA record for Pekin's water system
No health-based violations since 2016
Serves about 31,731 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 1
- 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 Pekin water hard?
Yes. It measures about 361 mg/L (21.1 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Pekin in grains per gallon?
About 21.1 gpg. One grain per gallon equals 17.1 mg/L, so 361 mg/L divided by 17.1 gives 21.1.
What size water softener do I need in Pekin?
For 3 people using 75 gallons each per day, 21.1 gpg works out to about 4,752 grains a day. A 48,000-grain softener covers that with a regeneration about every 10 days.
Has the Pekin water system had EPA violations?
EPA records show no health-based violations for IL American-Pekin since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Bartonville283 mg/LVery hard
- East Peoria361 mg/LVery hard
- Morton170 mg/LHard
- Peoria272 mg/LVery hard
- Washington230 mg/LVery hard
- Canton401 mg/LVery hard
- Lincoln222 mg/LVery hard
- Normal327 mg/LVery hard
- Bloomington89 mg/LModerately hard
- Galesburg331 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, June 13, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.