Hard water in Hammond, IN
County estimate from 921 water samples in Lake County · July 2026
- IN typical
- 178 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Hammond put hardness at about 210 mg/L (12.3 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 921 samples taken across Lake County, mostly wells and streams, not a test of Hammond's treated tap water. One more reason for caution: EPA lists Hammond's water system as using surface water, which is often softer than the wells behind the county figure.
At 210 mg/L, Hammond is 32 mg/L above the typical Indiana figure of 178. None of the 10 nearest cities we track has harder water. The range nearby runs from 134 mg/L in Highland to 210 in Munster.
What 210 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 210 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 × 12.3 gpg = 2,763 grains a day. A 24,000-grain unit regenerates about every 8 days.
EPA record for Hammond's water system
1 health-based violation since 2016
Serves about 78,384 people from surface water.
- Health-based
- 1
- Monitoring or reporting
- 8
- Open now
- 0
EPA lists this system as serving Hammond.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Lead and Copper Rulecorrosion control and lead sampling | 1 | 2020 | 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 Hammond water hard?
Yes. It measures about 210 mg/L (12.3 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Hammond in grains per gallon?
About 12.3 gpg. One grain per gallon equals 17.1 mg/L, so 210 mg/L divided by 17.1 gives 12.3.
What size water softener do I need in Hammond?
For 3 people using 75 gallons each per day, 12.3 gpg works out to about 2,763 grains a day. A 24,000-grain softener covers that with a regeneration about every 8 days.
Has the Hammond water system had EPA violations?
EPA records show 1 health-based violation for Hammond Water Works Department since 2016, involving Lead and Copper Rule. There were also 8 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- East Chicago135 mg/LHard
- Munster210 mg/LVery hard
- Highland134 mg/LHard
- Gary210 mg/LVery hard
- Dyer158 mg/LHard
- Schererville210 mg/LVery hard
- St. John210 mg/LVery hard
- Hobart210 mg/LVery hard
- Merrillville210 mg/LVery hard
- Crown Point210 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.