Hard water in Sycamore, IL
Reported by Sycamore · January 2025
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 32k grain
- Data
- Utility report
Tap water in Sycamore has about 289 mg/L of hardness, which is 16.9 grains per gallon. On the USGS scale that counts as very hard. The number comes from Sycamore, dated January 2025.
Sycamore sits 150 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 14 mg/L in West Dundee to 419 in Sugar Grove.
What 289 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 289 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 × 16.9 gpg = 3,802 grains a day. A 32,000-grain unit regenerates about every 8 days.
EPA record for Sycamore's water system
No health-based violations since 2016
Serves about 18,500 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 7
- 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 Sycamore water hard?
Yes. It measures about 289 mg/L (16.9 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Sycamore in grains per gallon?
About 16.9 gpg. One grain per gallon equals 17.1 mg/L, so 289 mg/L divided by 17.1 gives 16.9.
What size water softener do I need in Sycamore?
For 3 people using 75 gallons each per day, 16.9 gpg works out to about 3,802 grains a day. A 32,000-grain softener covers that with a regeneration about every 8 days.
Has the Sycamore water system had EPA violations?
EPA records show no health-based violations for Sycamore since 2016. There were also 7 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- DeKalb340 mg/LVery hard
- Hampshire60 mg/LModerately hard
- Elburn232 mg/LVery hard
- Pingree Grove65 mg/LModerately hard
- Huntley31 mg/LSoft
- Gilberts328 mg/LVery hard
- Elgin111 mg/LModerately hard
- South Elgin395 mg/LVery hard
- West Dundee14 mg/LSoft
- Sugar Grove419 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, January 9, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.