Hard water in East Alton, IL
Reported by IL American-Alton · September 2025
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
East Alton water measures 190 mg/L (11.1 gpg) of hardness, very hard by USGS standards. The number comes from IL American-Alton, dated September 2025.
At 190 mg/L, East Alton is 51 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 87 mg/L in Edwardsville to 276 in Granite City.
What 190 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 190 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 × 11.1 gpg = 2,500 grains a day. A 24,000-grain unit regenerates about every 9 days.
EPA record for East Alton's water system
No health-based violations since 2016
Serves about 5,786 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 1
EPA lists East Alton as the system serving East Alton. The hardness figure above comes from a different system's report, which TapWaterData uses for East Alton.
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 East Alton water hard?
Yes. It measures about 190 mg/L (11.1 grains per gallon), which the USGS classes as very hard.
What is the water hardness in East Alton in grains per gallon?
About 11.1 gpg. One grain per gallon equals 17.1 mg/L, so 190 mg/L divided by 17.1 gives 11.1.
What size water softener do I need in East Alton?
For 3 people using 75 gallons each per day, 11.1 gpg works out to about 2,500 grains a day. A 24,000-grain softener covers that with a regeneration about every 9 days.
Has the East Alton water system had EPA violations?
EPA records show no health-based violations for East Alton since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Wood River128 mg/LHard
- Alton190 mg/LVery hard
- Edwardsville87 mg/LModerately hard
- Granite City276 mg/LVery hard
- Collinsville276 mg/LVery hard
- East St. Louis157 mg/LHard
- Jerseyville108 mg/LModerately hard
- Fairview Heights157 mg/LHard
- Cahokia Heights157 mg/LHard
- Swansea157 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, September 10, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.