Cornelius, NC water hardness

Tap water hardness
31mg/L
1.8gpg
Soft

Reported by Charlotte Water · October 2025

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

The water in Cornelius carries roughly 31 mg/L of dissolved calcium and magnesium, or 1.8 grains per gallon. That is soft water. The number comes from Charlotte Water, dated October 2025.

Cornelius on the hardness scale, with nearby cities
060120180240300360+NC typical 31Westport: 14 mg/LWestport 14Belmont: 21 mg/LBelmont 21Mount Holly: 23 mg/LMount Holly 23Davidson: 31 mg/LDavidson 31Huntersville: 31 mg/LHuntersville 31Charlotte: 31 mg/LCharlotte 31Concord: 34 mg/LConcord 34Harrisburg: 41 mg/LHarrisburg 41Mooresville: 51 mg/LMooresville 51Kannapolis: 58 mg/LKannapolis 58Cornelius 31mg/L as calcium carbonate060120180240300360+NC 31Westport: 14 mg/LWestport 14Mount Holly: 23 mg/LMount Holly 23Davidson: 31 mg/LDavidson 31Huntersville: 31 mg/LHuntersvil. 31Mooresville: 51 mg/LMooresville 51Kannapolis: 58 mg/LKannapolis 5831 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 31 mg/L, Cornelius is close to the typical North Carolina figure of 31 mg/L. Of the 10 nearest cities we track, 3 have softer water and 4 have harder. The range nearby runs from 14 mg/L in Westport to 58 in Kannapolis.

What 31 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 31 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 Cornelius's water system

Charlotte Water · PWSID NC0160010

No health-based violations since 2016

Serves about 1,206,285 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Cornelius to this system. EPA's service-area records do not name Cornelius, so check the utility printed on your water bill.

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 Cornelius water hard?

No. It measures about 31 mg/L (1.8 grains per gallon), which the USGS classes as soft.

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

About 1.8 gpg. One grain per gallon equals 17.1 mg/L, so 31 mg/L divided by 17.1 gives 1.8.

Has the Cornelius water system had EPA violations?

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

Nearby cities

All 101 cities in North Carolina

Hardness data: TapWaterData US Water Hardness (utility report, October 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.