Old Westbury, NY water hardness

Tap water hardness
54mg/L
3.1gpg
SoftReports range 54–64

Reported by WA of Western Nassau · October 2025

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

Tap water in Old Westbury has about 54 mg/L of hardness, which is 3.1 grains per gallon. On the USGS scale that counts as soft. The number comes from WA of Western Nassau, dated October 2025. Reports for this system disagree, with values from 54 to 64 mg/L.

Old Westbury on the hardness scale, with nearby cities
060120180240300360+NY typical 31Hicksville: 18 mg/LHicksville 18New Cassel: 45 mg/LNew Cassel 45Carle Place: 51 mg/LCarle Place 51Mineola: 51 mg/LMineola 51Garden City Park: 51 mg/LGarden City Park 51Westbury: 55 mg/LWestbury 55Roslyn Heights: 55 mg/LRoslyn Heights 55Williston Park: 55 mg/LWilliston Park 55East Hills: 56 mg/LEast Hills 56North Hills: 66 mg/LNorth Hills 66Old Westbury 54mg/L as calcium carbonate060120180240300360+NY 31New Cassel: 45 mg/LNew Cassel 45Carle Place: 51 mg/LCarle Place 51Westbury: 55 mg/LWestbury 55Roslyn Heights: 55 mg/LRoslyn Hei. 55Williston Park: 55 mg/LWilliston. 55East Hills: 56 mg/LEast Hills 5654 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Old Westbury sits 23 mg/L above the typical New York figure of 31. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 18 mg/L in Hicksville to 66 in North Hills.

What 54 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 54 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 Old Westbury's water system

WA of Western Nassau · PWSID NY2902830

No health-based violations since 2016

Serves about 120,000 people from groundwater.

Health-based
0
Monitoring or reporting
1
Open now
0

TapWaterData ties Old Westbury to this system. EPA's service-area records do not name Old Westbury, so check the utility printed on your water bill.

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 Old Westbury water hard?

No. It measures about 54 mg/L (3.1 grains per gallon), which the USGS classes as soft.

What is the water hardness in Old Westbury in grains per gallon?

About 3.1 gpg. One grain per gallon equals 17.1 mg/L, so 54 mg/L divided by 17.1 gives 3.1.

Has the Old Westbury water system had EPA violations?

EPA records show no health-based violations for WA of Western Nassau since 2016. There were also 1 monitoring or reporting violation, 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 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.