How hard is the water in Mount Juliet, TN?

Tap water hardness
89mg/L
5.2gpg
Moderately hard

Reported by Metro Water Services · October 2025

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

The water in Mount Juliet carries roughly 89 mg/L of dissolved calcium and magnesium, or 5.2 grains per gallon. That is moderately hard water. The number comes from Metro Water Services, dated October 2025.

Mount Juliet on the hardness scale, with nearby cities
060120180240300360+TN typical 89Nolensville: 62 mg/LNolensville 62Lebanon: 78 mg/LLebanon 78Gallatin: 82 mg/LGallatin 82Green Hill: 89 mg/LGreen Hill 89Hendersonville: 89 mg/LHendersonville 89Goodlettsville: 89 mg/LGoodlettsville 89Nashville: 89 mg/LNashville 89Millersville: 89 mg/LMillersville 89La Vergne: 200 mg/LLa Vergne 200Smyrna: 200 mg/LSmyrna 200Mount Juliet 89mg/L as calcium carbonate060120180240300360+TN 89Lebanon: 78 mg/LLebanon 78Gallatin: 82 mg/LGallatin 82Green Hill: 89 mg/LGreen Hill 89Hendersonville: 89 mg/LHendersonv. 89Goodlettsville: 89 mg/LGoodlettsv. 89La Vergne: 200 mg/LLa Vergne 20089 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 89 mg/L, Mount Juliet is close to the typical Tennessee figure of 89 mg/L. Of the 10 nearest cities we track, 3 have softer water and 2 have harder. The range nearby runs from 62 mg/L in Nolensville to 200 in La Vergne.

What 89 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 Mount Juliet

3 people × 75 gallons a day × 5.2 gpg = 1,170 grains a day. A 24,000-grain unit regenerates about every 20 days.

Size it for your household

EPA record for Mount Juliet's water system

West Wilson Utility District · PWSID TN0000743

No health-based violations since 2016

Serves about 86,978 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists West Wilson Utility District as the system serving Mount Juliet. The hardness figure above comes from a different system's report, which TapWaterData uses for Mount Juliet.

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 Mount Juliet water hard?

Somewhat. It measures about 89 mg/L (5.2 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Mount Juliet in grains per gallon?

About 5.2 gpg. One grain per gallon equals 17.1 mg/L, so 89 mg/L divided by 17.1 gives 5.2.

What size water softener do I need in Mount Juliet?

For 3 people using 75 gallons each per day, 5.2 gpg works out to about 1,170 grains a day. A 24,000-grain softener covers that with a regeneration about every 20 days.

Has the Mount Juliet water system had EPA violations?

EPA records show no health-based violations for West Wilson Utility District since 2016.

Nearby cities

All 44 cities in Tennessee

Hardness data: TapWaterData US Water Hardness (utility report, October 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.