White Plains, NY water hardness

Tap water hardness
21mg/L
1.2gpg
Soft

Reported by White Plains City · August 2025

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

Tap water in White Plains has about 21 mg/L of hardness, which is 1.2 grains per gallon. On the USGS scale that counts as soft. The number comes from White Plains City, dated August 2025.

White Plains on the hardness scale, with nearby cities
060120180240300360+NY typical 31Irvington: 6 mg/LIrvington 6Mamaroneck: 6 mg/LMamaroneck 6Larchmont: 6 mg/LLarchmont 6Scarsdale: 13 mg/LScarsdale 13Eastchester: 14 mg/LEastchester 14Tuckahoe: 14 mg/LTuckahoe 14Harrison: 17 mg/LHarrison 17Elmsford: 17 mg/LElmsford 17Greenville: 17 mg/LGreenville 17Tarrytown: 19 mg/LTarrytown 19White Plains 21mg/L as calcium carbonate060120180240300360+NY 31Irvington: 6 mg/LIrvington 6Scarsdale: 13 mg/LScarsdale 13Eastchester: 14 mg/LEastchester 14Harrison: 17 mg/LHarrison 17Elmsford: 17 mg/LElmsford 17Greenville: 17 mg/LGreenville 1721 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 21 mg/L, White Plains is close to the typical New York figure of 31 mg/L. None of the 10 nearest cities we track has harder water. The range nearby runs from 6 mg/L in Irvington to 19 in Tarrytown.

What 21 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 21 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 White Plains's water system

White Plains City · PWSID NY5903464

No health-based violations since 2016

Serves about 59,559 people from surface water.

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 White Plains water hard?

No. It measures about 21 mg/L (1.2 grains per gallon), which the USGS classes as soft.

What is the water hardness in White Plains in grains per gallon?

About 1.2 gpg. One grain per gallon equals 17.1 mg/L, so 21 mg/L divided by 17.1 gives 1.2.

Has the White Plains water system had EPA violations?

EPA records show no health-based violations for White Plains City since 2016.

Nearby cities

All 149 cities in New York

Hardness data: TapWaterData US Water Hardness (utility report, August 19, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.