How hard is the water in Columbus, IN?

Tap water hardness
107mg/L
6.3gpg
Moderately hard

Reported by Columbus Municipal Utilitiy · February 2025

IN typical
178 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Columbus water measures 107 mg/L (6.3 gpg) of hardness, moderately hard by USGS standards. The number comes from Columbus Municipal Utilitiy, dated February 2025.

Columbus on the hardness scale, with nearby cities
060120180240300360+IN typical 178Bloomington: 42 mg/LBloomington 42Greenwood: 178 mg/LGreenwood 178Beech Grove: 178 mg/LBeech Grove 178Mooresville: 178 mg/LMooresville 178Indianapolis: 178 mg/LIndianapolis 178Plainfield: 178 mg/LPlainfield 178Speedway: 178 mg/LSpeedway 178Seymour: 208 mg/LSeymour 208Greenfield: 292 mg/LGreenfield 292Franklin: 322 mg/LFranklin 322Columbus 107mg/L as calcium carbonate060120180240300360+IN 178Bloomington: 42 mg/LBloomington 42Greenwood: 178 mg/LGreenwood 178Beech Grove: 178 mg/LBeech Grove 178Mooresville: 178 mg/LMooresville 178Seymour: 208 mg/LSeymour 208Franklin: 322 mg/LFranklin 322107 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Columbus sits 71 mg/L below the typical Indiana figure of 178. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 42 mg/L in Bloomington to 322 in Franklin.

What 107 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Columbus

3 people × 75 gallons a day × 6.3 gpg = 1,408 grains a day. A 24,000-grain unit regenerates about every 17 days.

Size it for your household

EPA record for Columbus's water system

Columbus Municipal Utility · PWSID IN5203002

No health-based violations since 2016

Serves about 51,122 people from groundwater.

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 Columbus water hard?

Somewhat. It measures about 107 mg/L (6.3 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Columbus in grains per gallon?

About 6.3 gpg. One grain per gallon equals 17.1 mg/L, so 107 mg/L divided by 17.1 gives 6.3.

What size water softener do I need in Columbus?

For 3 people using 75 gallons each per day, 6.3 gpg works out to about 1,408 grains a day. A 24,000-grain softener covers that with a regeneration about every 17 days.

Has the Columbus water system had EPA violations?

EPA records show no health-based violations for Columbus Municipal Utility since 2016.

Nearby cities

All 53 cities in Indiana

Hardness data: TapWaterData US Water Hardness (utility report, February 26, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.