Hard water in Wood River, IL
Calculated from the utility's calcium and magnesium results · June 2022
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Calculated from utility data
Wood River water measures 128 mg/L (7.5 gpg) of hardness, hard by USGS standards. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (June 2022).
At 128 mg/L, Wood River is 11 mg/L below the typical Illinois figure of 139. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 87 mg/L in Edwardsville to 276 in Granite City.
What 128 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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 128 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 × 7.5 gpg = 1,685 grains a day. A 24,000-grain unit regenerates about every 14 days.
EPA record for Wood River's water system
No health-based violations since 2016
Serves about 10,464 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 6
- Open now
- 0
EPA lists this system as serving Wood River.
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 Wood River water hard?
Yes. It measures about 128 mg/L (7.5 grains per gallon), which the USGS classes as hard.
What is the water hardness in Wood River in grains per gallon?
About 7.5 gpg. One grain per gallon equals 17.1 mg/L, so 128 mg/L divided by 17.1 gives 7.5.
What size water softener do I need in Wood River?
For 3 people using 75 gallons each per day, 7.5 gpg works out to about 1,685 grains a day. A 24,000-grain softener covers that with a regeneration about every 14 days.
Has the Wood River water system had EPA violations?
EPA records show no health-based violations for Wood River since 2016. There were also 6 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- East Alton190 mg/LVery hard
- Alton190 mg/LVery hard
- Edwardsville87 mg/LModerately hard
- Granite City276 mg/LVery hard
- Collinsville276 mg/LVery hard
- East St. Louis157 mg/LHard
- Fairview Heights157 mg/LHard
- Cahokia Heights157 mg/LHard
- Swansea157 mg/LHard
- Jerseyville108 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (calculated from utility data, June 10, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.