Larchmont, NY water hardness

Tap water hardness
6mg/L
0.4gpg
Soft

Reported by Westchester Joint Water Works · October 2025

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

Tap water in Larchmont has about 6 mg/L of hardness, which is 0.4 grains per gallon. On the USGS scale that counts as soft. The number comes from Westchester Joint Water Works, dated October 2025.

Larchmont on the hardness scale, with nearby cities
060120180240300360+NY typical 31New Rochelle: 6 mg/LNew Rochelle 6Mamaroneck: 6 mg/LMamaroneck 6Scarsdale: 13 mg/LScarsdale 13Eastchester: 14 mg/LEastchester 14Tuckahoe: 14 mg/LTuckahoe 14Greenville: 17 mg/LGreenville 17Pelham: 22 mg/LPelham 22Pelham Manor: 24 mg/LPelham Manor 24Mount Vernon: 24 mg/LMount Vernon 24Yonkers: 35 mg/LYonkers 35Larchmont 6mg/L as calcium carbonate060120180240300360+NY 31New Rochelle: 6 mg/LNew Rochel. 6Mamaroneck: 6 mg/LMamaroneck 6Eastchester: 14 mg/LEastchester 14Pelham: 22 mg/LPelham 22Pelham Manor: 24 mg/LPelham Man. 24Mount Vernon: 24 mg/LMount Vern. 246 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 6 mg/L, Larchmont is 25 mg/L below the typical New York figure of 31. None of the 10 nearest cities we track has softer water. The range nearby runs from 6 mg/L in New Rochelle to 35 in Yonkers.

What 6 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 6 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 Larchmont's water system

Larchmont Village · PWSID NY5903433

No health-based violations since 2016

Serves about 6,485 people from surface water.

Health-based
0
Monitoring or reporting
2
Open now
0

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

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 Larchmont water hard?

No. It measures about 6 mg/L (0.4 grains per gallon), which the USGS classes as soft.

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

About 0.4 gpg. One grain per gallon equals 17.1 mg/L, so 6 mg/L divided by 17.1 gives 0.4.

Has the Larchmont water system had EPA violations?

EPA records show no health-based violations for Larchmont Village since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 149 cities in New York

Hardness data: TapWaterData US Water Hardness (utility report, October 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.