Mount Holly, NC water hardness

Tap water hardness
23mg/L
1.3gpg
Soft

Reported by Mount Holly, City of · June 2025

NC typical
31 mg/L
EPA health violations since 2016
0
Data
Utility report

Tap water in Mount Holly has about 23 mg/L of hardness, which is 1.3 grains per gallon. On the USGS scale that counts as soft. The number comes from Mount Holly, City of, dated June 2025.

Mount Holly on the hardness scale, with nearby cities
060120180240300360+NC typical 31Westport: 14 mg/LWestport 14Lincolnton: 14 mg/LLincolnton 14Belmont: 21 mg/LBelmont 21Gastonia: 28 mg/LGastonia 28Huntersville: 31 mg/LHuntersville 31Charlotte: 31 mg/LCharlotte 31Cornelius: 31 mg/LCornelius 31Davidson: 31 mg/LDavidson 31Pineville: 31 mg/LPineville 31Harrisburg: 41 mg/LHarrisburg 41Mount Holly 23mg/L as calcium carbonate060120180240300360+NC 31Westport: 14 mg/LWestport 14Belmont: 21 mg/LBelmont 21Gastonia: 28 mg/LGastonia 28Huntersville: 31 mg/LHuntersvil. 31Charlotte: 31 mg/LCharlotte 31Cornelius: 31 mg/LCornelius 3123 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Mount Holly sits close to the typical North Carolina figure of 31 mg/L. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 14 mg/L in Westport to 41 in Harrisburg.

What 23 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 23 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Mount Holly's water system

Mount Holly, City of · PWSID NC0136020

No health-based violations since 2016

Serves about 19,200 people from surface water.

Health-based
0
Monitoring or reporting
5
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 Mount Holly water hard?

No. It measures about 23 mg/L (1.3 grains per gallon), which the USGS classes as soft.

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

About 1.3 gpg. One grain per gallon equals 17.1 mg/L, so 23 mg/L divided by 17.1 gives 1.3.

Has the Mount Holly water system had EPA violations?

EPA records show no health-based violations for Mount Holly, City of since 2016. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 101 cities in North Carolina

Hardness data: TapWaterData US Water Hardness (utility report, June 30, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.