Hard water in Notre Dame, IN
Reported by South Bend Water Works · July 2025
- IN typical
- 178 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 24k grain
- Data
- Utility report
Notre Dame water measures 220 mg/L (12.9 gpg) of hardness, very hard by USGS standards. The number comes from South Bend Water Works, dated July 2025.
At 220 mg/L, Notre Dame is 42 mg/L above the typical Indiana figure of 178. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 134 mg/L in Highland to 314 in Goshen.
What 220 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 220 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 × 12.9 gpg = 2,896 grains a day. A 24,000-grain unit regenerates about every 8 days.
EPA record for Notre Dame's water system
1 health-based violation since 2016
Serves about 7,400 people from groundwater.
- Health-based
- 1
- Monitoring or reporting
- 5
- Open now
- 0
EPA lists University of Notre Dame as the system serving Notre Dame. The hardness figure above comes from a different system's report, which TapWaterData uses for Notre Dame.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Total Coliform Rulebacteria | 1 | 2017 | 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 Notre Dame water hard?
Yes. It measures about 220 mg/L (12.9 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Notre Dame in grains per gallon?
About 12.9 gpg. One grain per gallon equals 17.1 mg/L, so 220 mg/L divided by 17.1 gives 12.9.
What size water softener do I need in Notre Dame?
For 3 people using 75 gallons each per day, 12.9 gpg works out to about 2,896 grains a day. A 24,000-grain softener covers that with a regeneration about every 8 days.
Has the Notre Dame water system had EPA violations?
EPA records show 1 health-based violation for University of Notre Dame since 2016, involving Total Coliform Rule. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- South Bend220 mg/LVery hard
- Elkhart312 mg/LVery hard
- Goshen314 mg/LVery hard
- Valparaiso209 mg/LVery hard
- Hobart210 mg/LVery hard
- Gary210 mg/LVery hard
- Merrillville210 mg/LVery hard
- Crown Point210 mg/LVery hard
- East Chicago135 mg/LHard
- Highland134 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, July 21, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.