Hard water in South Elgin, IL

Tap water hardness
395mg/L
23.1gpg
Very hardReports range 395–470

Reported by South Elgin · October 2024

IL typical
139 mg/L
EPA health violations since 2016
2
Softener for 3 people
48k grain
Data
Utility report

South Elgin water measures 395 mg/L (23.1 gpg) of hardness, very hard by USGS standards. The number comes from South Elgin, dated October 2024. Reports for this system disagree, with values from 395 to 470 mg/L.

South Elgin on the hardness scale, with nearby cities
060120180240300360+IL typical 139West Dundee: 14 mg/LWest Dundee 14Pingree Grove: 65 mg/LPingree Grove 65Elgin: 111 mg/LElgin 111Hanover Park: 140 mg/LHanover Park 140St. Charles: 215 mg/LSt. Charles 215Streamwood: 229 mg/LStreamwood 229Bartlett: 287 mg/LBartlett 287West Chicago: 287 mg/LWest Chicago 287Geneva: 320 mg/LGeneva 320Gilberts: 328 mg/LGilberts 328South Elgin 395off the scalemg/L as calcium carbonate060120180240300360+IL 139West Dundee: 14 mg/LWest Dundee 14Elgin: 111 mg/LElgin 111St. Charles: 215 mg/LSt. Charles 215Streamwood: 229 mg/LStreamwood 229Bartlett: 287 mg/LBartlett 287Geneva: 320 mg/LGeneva 320395 mg/Loff the scalemg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 395 mg/L, South Elgin is 256 mg/L above the typical Illinois figure of 139. None of the 10 nearest cities we track has harder water. The range nearby runs from 14 mg/L in West Dundee to 328 in Gilberts.

What 395 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 395 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.

Softener size for South Elgin

3 people × 75 gallons a day × 23.1 gpg = 5,198 grains a day. A 48,000-grain unit regenerates about every 9 days.

Size it for your household

EPA record for South Elgin's water system

South Elgin · PWSID IL0890800

2 health-based violations since 2016

Serves about 23,648 people from groundwater.

Health-based
2
Monitoring or reporting
6
Open now
2
20162017201820192020202120222023202420252026BariumLead and Copper Rule'16'18'20'22'24'26BariumLead and Copper Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Barium12026Resolved
Lead and Copper Rulecorrosion control and lead sampling12025Resolved

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 South Elgin water hard?

Yes. It measures about 395 mg/L (23.1 grains per gallon), which the USGS classes as very hard.

What is the water hardness in South Elgin in grains per gallon?

About 23.1 gpg. One grain per gallon equals 17.1 mg/L, so 395 mg/L divided by 17.1 gives 23.1.

What size water softener do I need in South Elgin?

For 3 people using 75 gallons each per day, 23.1 gpg works out to about 5,198 grains a day. A 48,000-grain softener covers that with a regeneration about every 9 days.

Has the South Elgin water system had EPA violations?

EPA records show 2 health-based violations for South Elgin since 2016, involving Barium, Lead and Copper Rule. There were also 6 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, October 27, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.