How hard is the water in Clarksville, TN?

Tap water hardness
71mg/L
4.1gpg
Moderately hard

Reported by Clarksville Water Department · January 2025

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

Clarksville water measures 71 mg/L (4.1 gpg) of hardness, moderately hard by USGS standards. The number comes from Clarksville Water Department, dated January 2025.

Clarksville on the hardness scale, with nearby cities
060120180240300360+TN typical 89Gallatin: 82 mg/LGallatin 82Ashland City: 89 mg/LAshland City 89Millersville: 89 mg/LMillersville 89Goodlettsville: 89 mg/LGoodlettsville 89Nashville: 89 mg/LNashville 89Hendersonville: 89 mg/LHendersonville 89Green Hill: 89 mg/LGreen Hill 89Brentwood: 89 mg/LBrentwood 89Franklin: 98 mg/LFranklin 98Springfield: 199 mg/LSpringfield 199Clarksville 71mg/L as calcium carbonate060120180240300360+TN 89Ashland City: 89 mg/LAshland Ci. 89Millersville: 89 mg/LMillersvil. 89Goodlettsville: 89 mg/LGoodlettsv. 89Nashville: 89 mg/LNashville 89Hendersonville: 89 mg/LHendersonv. 89Springfield: 199 mg/LSpringfield 19971 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Clarksville sits 18 mg/L below the typical Tennessee figure of 89. None of the 10 nearest cities we track has softer water. The range nearby runs from 82 mg/L in Gallatin to 199 in Springfield.

What 71 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 × 4.1 gpg = 931 grains a day. A 24,000-grain unit regenerates about every 25 days.

Size it for your household

EPA record for Clarksville's water system

Clarksville Water Department · PWSID TN0000116

No health-based violations since 2016

Serves about 251,864 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 Clarksville water hard?

Somewhat. It measures about 71 mg/L (4.1 grains per gallon), which the USGS classes as moderately hard.

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

About 4.1 gpg. One grain per gallon equals 17.1 mg/L, so 71 mg/L divided by 17.1 gives 4.1.

What size water softener do I need in Clarksville?

For 3 people using 75 gallons each per day, 4.1 gpg works out to about 931 grains a day. A 24,000-grain softener covers that with a regeneration about every 25 days.

Has the Clarksville water system had EPA violations?

EPA records show no health-based violations for Clarksville Water Department since 2016.

Nearby cities

All 44 cities in Tennessee

Hardness data: TapWaterData US Water Hardness (utility report, January 23, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.