Hard water in Wonder Lake, IL
Calculated from the utility's calcium and magnesium results · June 2022
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 32k grain
- Data
- Calculated from utility data
The water in Wonder Lake carries roughly 292 mg/L of dissolved calcium and magnesium, or 17.1 grains per gallon. That is very hard water. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (June 2022).
At 292 mg/L, Wonder Lake is 153 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 146 mg/L in Volo to 388 in Crystal Lake.
What 292 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 292 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 × 17.1 gpg = 3,845 grains a day. A 32,000-grain unit regenerates about every 8 days.
EPA record for Wonder Lake's water system
1 health-based violation since 2016
Serves about 3,870 people from groundwater.
- Health-based
- 1
- Monitoring or reporting
- 4
- Open now
- 0
EPA lists this system as serving Wonder Lake.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Lead and Copper Rulecorrosion control and lead sampling | 1 | 2023 | Resolved |
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 Wonder Lake water hard?
Yes. It measures about 292 mg/L (17.1 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Wonder Lake in grains per gallon?
About 17.1 gpg. One grain per gallon equals 17.1 mg/L, so 292 mg/L divided by 17.1 gives 17.1.
What size water softener do I need in Wonder Lake?
For 3 people using 75 gallons each per day, 17.1 gpg works out to about 3,845 grains a day. A 32,000-grain softener covers that with a regeneration about every 8 days.
Has the Wonder Lake water system had EPA violations?
EPA records show 1 health-based violation for Wonder Lake since 2016, involving Lead and Copper Rule. There were also 4 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- McHenry384 mg/LVery hard
- Johnsburg353 mg/LVery hard
- Woodstock343 mg/LVery hard
- Lakemoor223 mg/LVery hard
- Crystal Lake388 mg/LVery hard
- Volo146 mg/LHard
- Cary378 mg/LVery hard
- Wauconda146 mg/LHard
- Lake in the Hills283 mg/LVery hard
- Lake Villa205 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (calculated from utility data, June 6, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.