Hard water in New Lenox, IL
Reported by New Lenox · August 2025
- IL typical
- 139 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in New Lenox carries roughly 137 mg/L of dissolved calcium and magnesium, or 8.0 grains per gallon. That is hard water. The number comes from New Lenox, dated August 2025.
At 137 mg/L, New Lenox is close to the typical Illinois figure of 139 mg/L. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 91 mg/L in Mokena to 465 in Crest Hill.
What 137 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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 137 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 × 8.0 gpg = 1,802 grains a day. A 24,000-grain unit regenerates about every 13 days.
EPA record for New Lenox's water system
No health-based violations since 2016
Serves about 29,200 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- 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 New Lenox water hard?
Yes. It measures about 137 mg/L (8.0 grains per gallon), which the USGS classes as hard.
What is the water hardness in New Lenox in grains per gallon?
About 8.0 gpg. One grain per gallon equals 17.1 mg/L, so 137 mg/L divided by 17.1 gives 8.0.
What size water softener do I need in New Lenox?
For 3 people using 75 gallons each per day, 8.0 gpg works out to about 1,802 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.
Has the New Lenox water system had EPA violations?
EPA records show no health-based violations for New Lenox since 2016.
Nearby cities
- Mokena91 mg/LModerately hard
- Frankfort287 mg/LVery hard
- Manhattan372 mg/LVery hard
- Lockport458 mg/LVery hard
- Homer Glen287 mg/LVery hard
- Crest Hill465 mg/LVery hard
- Orland Hills147 mg/LHard
- Orland Park147 mg/LHard
- Joliet244 mg/LVery hard
- Tinley Park300 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, August 11, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.