Hard water in Johnsburg, IL
Reported by Johnsburg No.2 · June 2022
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- Utility report
Tap water in Johnsburg has about 353 mg/L of hardness, which is 20.6 grains per gallon. On the USGS scale that counts as very hard. The number comes from Johnsburg No.2, dated June 2022.
At 353 mg/L, Johnsburg is 214 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 146 mg/L in Volo to 388 in Crystal Lake.
What 353 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 353 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 × 20.6 gpg = 4,644 grains a day. A 48,000-grain unit regenerates about every 10 days.
EPA record for Johnsburg's water system
No health-based violations since 2016
Serves about 1,124 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 11
- 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 Johnsburg water hard?
Yes. It measures about 353 mg/L (20.6 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Johnsburg in grains per gallon?
About 20.6 gpg. One grain per gallon equals 17.1 mg/L, so 353 mg/L divided by 17.1 gives 20.6.
What size water softener do I need in Johnsburg?
For 3 people using 75 gallons each per day, 20.6 gpg works out to about 4,644 grains a day. A 48,000-grain softener covers that with a regeneration about every 10 days.
Has the Johnsburg water system had EPA violations?
EPA records show no health-based violations for Johnsburg No.2 since 2016. There were also 11 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Lakemoor223 mg/LVery hard
- McHenry384 mg/LVery hard
- Wonder Lake292 mg/LVery hard
- Volo146 mg/LHard
- Lake Villa205 mg/LVery hard
- Wauconda146 mg/LHard
- Woodstock343 mg/LVery hard
- Grayslake250 mg/LVery hard
- Crystal Lake388 mg/LVery hard
- Cary378 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, June 7, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.