How hard is the water in Clarksville, IN?

Tap water hardness
106mg/L
6.2gpg
Moderately hardCounty estimate

County estimate from 25 water samples in Clark County · July 2026

IN typical
178 mg/L
Softener for 3 people
24k grain
Data
County estimate

Water samples from around Clarksville put hardness at about 106 mg/L (6.2 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 25 samples taken across Clark County, mostly wells and streams, not a test of Clarksville's treated tap water.

Clarksville on the hardness scale, with nearby cities
060120180240300360+IN typical 178Bloomington: 42 mg/LBloomington 42Hidden Valley: 104 mg/LHidden Valley 104Columbus: 107 mg/LColumbus 107Jeffersonville: 109 mg/LJeffersonville 109Evansville: 134 mg/LEvansville 134Greenwood: 178 mg/LGreenwood 178Mooresville: 178 mg/LMooresville 178Beech Grove: 178 mg/LBeech Grove 178Seymour: 208 mg/LSeymour 208Franklin: 322 mg/LFranklin 322Clarksville 106mg/L as calcium carbonate060120180240300360+IN 178Bloomington: 42 mg/LBloomington 42Hidden Valley: 104 mg/LHidden Val. 104Columbus: 107 mg/LColumbus 107Jeffersonville: 109 mg/LJeffersonv. 109Seymour: 208 mg/LSeymour 208Franklin: 322 mg/LFranklin 322106 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 106 mg/L, Clarksville is 72 mg/L below the typical Indiana figure of 178. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 42 mg/L in Bloomington to 322 in Franklin.

What 106 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 Clarksville

3 people × 75 gallons a day × 6.2 gpg = 1,395 grains a day. A 24,000-grain unit regenerates about every 17 days.

Size it for your household

EPA record for Clarksville's water system

We could not match Clarksville to a community water system in EPA's records. Your water bill or the yearly Consumer Confidence Report names the system and its ID.

Questions

Is Clarksville water hard?

Somewhat. It measures about 106 mg/L (6.2 grains per gallon), which the USGS classes as moderately hard.

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

About 6.2 gpg. One grain per gallon equals 17.1 mg/L, so 106 mg/L divided by 17.1 gives 6.2.

What size water softener do I need in Clarksville?

For 3 people using 75 gallons each per day, 6.2 gpg works out to about 1,395 grains a day. A 24,000-grain softener covers that with a regeneration about every 17 days.

Nearby cities

All 53 cities in Indiana

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.