Mandeville, LA water hardness

Tap water hardness
48mg/L
2.8gpg
Soft

Reported by Mandeville Water Supply · March 2025

LA typical
102 mg/L
EPA health violations since 2016
0
Data
Utility report

Tap water in Mandeville has about 48 mg/L of hardness, which is 2.8 grains per gallon. On the USGS scale that counts as soft. The number comes from Mandeville Water Supply, dated March 2025.

Mandeville on the hardness scale, with nearby cities
060120180240300360+LA typical 102Covington: 4 mg/LCovington 4Hammond: 27 mg/LHammond 27Slidell: 42 mg/LSlidell 42Metairie: 135 mg/LMetairie 135New Orleans: 153 mg/LNew Orleans 153Gretna: 153 mg/LGretna 153Jefferson: 154 mg/LJefferson 154Elmwood: 154 mg/LElmwood 154Bridge City: 154 mg/LBridge City 154Westwego: 154 mg/LWestwego 154Mandeville 48mg/L as calcium carbonate060120180240300360+LA 102Covington: 4 mg/LCovington 4Hammond: 27 mg/LHammond 27Slidell: 42 mg/LSlidell 42Metairie: 135 mg/LMetairie 135New Orleans: 153 mg/LNew Orleans 153Jefferson: 154 mg/LJefferson 15448 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Mandeville sits 54 mg/L below the typical Louisiana figure of 102. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 4 mg/L in Covington to 154 in Jefferson.

What 48 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 48 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 Mandeville's water system

City of Mandeville Water Supply · PWSID LA1103023

No health-based violations since 2016

Serves about 13,000 people from groundwater.

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 Mandeville water hard?

No. It measures about 48 mg/L (2.8 grains per gallon), which the USGS classes as soft.

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

About 2.8 gpg. One grain per gallon equals 17.1 mg/L, so 48 mg/L divided by 17.1 gives 2.8.

Has the Mandeville water system had EPA violations?

EPA records show no health-based violations for City of Mandeville Water Supply since 2016.

Nearby cities

All 32 cities in Louisiana

Hardness data: TapWaterData US Water Hardness (utility report, March 12, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.