Hard water in Lockport, IL
Reported by College View Subdivision · June 2022
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- Utility report
The water in Lockport carries roughly 458 mg/L of dissolved calcium and magnesium, or 26.8 grains per gallon. That is very hard water. The number comes from College View Subdivision, dated June 2022.
Lockport sits 319 mg/L above the typical Illinois figure of 139. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 91 mg/L in Mokena to 465 in Crest Hill.
What 458 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 458 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 × 26.8 gpg = 6,026 grains a day. A 48,000-grain unit regenerates about every 7 days.
EPA record for Lockport's water system
No health-based violations since 2016
Serves about 570 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 3
- Open now
- 2
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 Lockport water hard?
Yes. It measures about 458 mg/L (26.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Lockport in grains per gallon?
About 26.8 gpg. One grain per gallon equals 17.1 mg/L, so 458 mg/L divided by 17.1 gives 26.8.
What size water softener do I need in Lockport?
For 3 people using 75 gallons each per day, 26.8 gpg works out to about 6,026 grains a day. A 48,000-grain softener covers that with a regeneration about every 7 days.
Has the Lockport water system had EPA violations?
EPA records show no health-based violations for College View Subdivision since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Homer Glen287 mg/LVery hard
- Crest Hill465 mg/LVery hard
- Romeoville303 mg/LVery hard
- Lemont228 mg/LVery hard
- New Lenox137 mg/LHard
- Bolingbrook287 mg/LVery hard
- Joliet244 mg/LVery hard
- Orland Park147 mg/LHard
- Mokena91 mg/LModerately hard
- Orland Hills147 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, June 2, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.