Hard water in Evansville, IN
Reported by Evansville Water Utility · August 2025
- IN typical
- 178 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Evansville water measures 134 mg/L (7.8 gpg) of hardness, hard by USGS standards. The number comes from Evansville Water Utility, dated August 2025.
At 134 mg/L, Evansville is 44 mg/L below the typical Indiana figure of 178. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 42 mg/L in Bloomington to 322 in Franklin.
What 134 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 134 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 × 7.8 gpg = 1,764 grains a day. A 24,000-grain unit regenerates about every 13 days.
EPA record for Evansville's water system
No health-based violations since 2016
Serves about 182,444 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 Evansville water hard?
Yes. It measures about 134 mg/L (7.8 grains per gallon), which the USGS classes as hard.
What is the water hardness in Evansville in grains per gallon?
About 7.8 gpg. One grain per gallon equals 17.1 mg/L, so 134 mg/L divided by 17.1 gives 7.8.
What size water softener do I need in Evansville?
For 3 people using 75 gallons each per day, 7.8 gpg works out to about 1,764 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.
Has the Evansville water system had EPA violations?
EPA records show no health-based violations for Evansville Water Utility since 2016.
Nearby cities
- Bloomington42 mg/LSoft
- Clarksville106 mg/LModerately hard
- Terre Haute221 mg/LVery hard
- Jeffersonville109 mg/LModerately hard
- Seymour208 mg/LVery hard
- Columbus107 mg/LModerately hard
- Mooresville178 mg/LHard
- Franklin322 mg/LVery hard
- Plainfield178 mg/LHard
- Danville178 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, August 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.