Dunn, NC water hardness

Tap water hardness
51mg/L
3.0gpg
Soft

Reported by Harnett Regional Water · February 2025

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

Tap water in Dunn has about 51 mg/L of hardness, which is 3.0 grains per gallon. On the USGS scale that counts as soft. The number comes from Harnett Regional Water, dated February 2025.

Dunn on the hardness scale, with nearby cities
060120180240300360+NC typical 31Garner: 25 mg/LGarner 25Apex: 27 mg/LApex 27Fayetteville: 29 mg/LFayetteville 29Hope Mills: 29 mg/LHope Mills 29Holly Springs: 41 mg/LHolly Springs 41Lillington: 51 mg/LLillington 51Angier: 51 mg/LAngier 51Anderson Creek: 51 mg/LAnderson Creek 51Barbecue: 51 mg/LBarbecue 51Spout Springs: 51 mg/LSpout Springs 51Dunn 51mg/L as calcium carbonate060120180240300360+NC 31Fayetteville: 29 mg/LFayettevil. 29Lillington: 51 mg/LLillington 51Angier: 51 mg/LAngier 51Anderson Creek: 51 mg/LAnderson C. 51Barbecue: 51 mg/LBarbecue 51Spout Springs: 51 mg/LSpout Spri. 5151 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 51 mg/L, Dunn is 20 mg/L above the typical North Carolina figure of 31. None of the 10 nearest cities we track has harder water. The range nearby runs from 25 mg/L in Garner to 51 in Lillington.

What 51 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 51 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 Dunn's water system

Dunn, City of · PWSID NC0343010

No health-based violations since 2016

Serves about 12,497 people from surface water.

Health-based
0
Monitoring or reporting
1
Open now
0

EPA lists Dunn, City of as the system serving Dunn. The hardness figure above comes from a different system's report, which TapWaterData uses for Dunn.

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 Dunn water hard?

No. It measures about 51 mg/L (3.0 grains per gallon), which the USGS classes as soft.

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

About 3.0 gpg. One grain per gallon equals 17.1 mg/L, so 51 mg/L divided by 17.1 gives 3.0.

Has the Dunn water system had EPA violations?

EPA records show no health-based violations for Dunn, City of since 2016. There were also 1 monitoring or reporting violation, 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, February 27, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.