Hard water in Roscoe, IL
Reported by North Park PWD · September 2024
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- Utility report
Roscoe water measures 387 mg/L (22.6 gpg) of hardness, very hard by USGS standards. The number comes from North Park PWD, dated September 2024.
At 387 mg/L, Roscoe is 248 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 8 have softer water and 1 has harder. The range nearby runs from 60 mg/L in Hampshire to 416 in Belvidere.
What 387 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 387 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 × 22.6 gpg = 5,092 grains a day. A 48,000-grain unit regenerates about every 9 days.
EPA record for Roscoe's water system
No health-based violations since 2016
Serves about 35,580 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
TapWaterData ties Roscoe to this system. EPA's service-area records do not name Roscoe, so check the utility printed on your water bill.
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 Roscoe water hard?
Yes. It measures about 387 mg/L (22.6 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Roscoe in grains per gallon?
About 22.6 gpg. One grain per gallon equals 17.1 mg/L, so 387 mg/L divided by 17.1 gives 22.6.
What size water softener do I need in Roscoe?
For 3 people using 75 gallons each per day, 22.6 gpg works out to about 5,092 grains a day. A 48,000-grain softener covers that with a regeneration about every 9 days.
Has the Roscoe water system had EPA violations?
EPA records show no health-based violations for North Park PWD since 2016.
Nearby cities
- Rockton295 mg/LVery hard
- Machesney Park387 mg/LVery hard
- Loves Park316 mg/LVery hard
- Rockford329 mg/LVery hard
- Belvidere416 mg/LVery hard
- Woodstock343 mg/LVery hard
- Freeport350 mg/LVery hard
- Hampshire60 mg/LModerately hard
- Wonder Lake292 mg/LVery hard
- Sycamore289 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, September 13, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.