Hammond, LA water hardness

Tap water hardness
27mg/L
1.6gpg
SoftCounty estimate

County estimate from 912 water samples in Tangipahoa Parish · July 2026

LA typical
102 mg/L
EPA health violations since 2016
2
Data
County estimate

Water samples from around Hammond put hardness at about 27 mg/L (1.6 gpg), which would be soft on the USGS scale. Treat this as a rough guide: it is the median of 912 samples taken across Tangipahoa Parish, mostly wells and streams, not a test of Hammond's treated tap water.

Hammond on the hardness scale, with nearby cities
060120180240300360+LA typical 102Covington: 4 mg/LCovington 4Baton Rouge: 23 mg/LBaton Rouge 23Slidell: 42 mg/LSlidell 42Mandeville: 48 mg/LMandeville 48Zachary: 55 mg/LZachary 55Prairieville: 66 mg/LPrairieville 66Metairie: 135 mg/LMetairie 135Elmwood: 154 mg/LElmwood 154Jefferson: 154 mg/LJefferson 154Bridge City: 154 mg/LBridge City 154Hammond 27mg/L as calcium carbonate060120180240300360+LA 102Covington: 4 mg/LCovington 4Baton Rouge: 23 mg/LBaton Rouge 23Mandeville: 48 mg/LMandeville 48Prairieville: 66 mg/LPrairievil. 66Metairie: 135 mg/LMetairie 135Elmwood: 154 mg/LElmwood 15427 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Hammond sits 75 mg/L below the typical Louisiana figure of 102. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 4 mg/L in Covington to 154 in Elmwood.

What 27 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 27 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 Hammond's water system

City of Hammond Water System · PWSID LA1105009

2 health-based violations since 2016

Serves about 21,135 people from groundwater.

Health-based
2
Monitoring or reporting
0
Open now
0

EPA lists this system as serving Hammond.

20162017201820192020202120222023202420252026Chlorine dioxide level'16'18'20'22'24'26Chlorine dioxide level
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Chlorine dioxide leveldisinfectant22016Resolved

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 Hammond water hard?

No. It measures about 27 mg/L (1.6 grains per gallon), which the USGS classes as soft.

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

About 1.6 gpg. One grain per gallon equals 17.1 mg/L, so 27 mg/L divided by 17.1 gives 1.6.

Has the Hammond water system had EPA violations?

EPA records show 2 health-based violations for City of Hammond Water System since 2016, involving Chlorine dioxide level.

Nearby cities

All 32 cities in Louisiana

Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.