Oyster Bay, NY water hardness

Tap water hardness
45mg/L
2.6gpg
Soft

Calculated from the utility's calcium and magnesium results · February 2025

NY typical
31 mg/L
EPA health violations since 2016
0
Data
Calculated from utility data

The water in Oyster Bay carries roughly 45 mg/L of dissolved calcium and magnesium, or 2.6 grains per gallon. That is soft water. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (February 2025).

Oyster Bay on the hardness scale, with nearby cities
060120180240300360+NY typical 31Hicksville: 18 mg/LHicksville 18Huntington: 21 mg/LHuntington 21Syosset: 24 mg/LSyosset 24New Cassel: 45 mg/LNew Cassel 45Old Westbury: 54 mg/LOld Westbury 54Plainview: 54 mg/LPlainview 54Westbury: 55 mg/LWestbury 55Roslyn Heights: 55 mg/LRoslyn Heights 55East Hills: 56 mg/LEast Hills 56Port Washington: 59 mg/LPort Washington 59Oyster Bay 45mg/L as calcium carbonate060120180240300360+NY 31Hicksville: 18 mg/LHicksville 18Huntington: 21 mg/LHuntington 21Syosset: 24 mg/LSyosset 24Old Westbury: 54 mg/LOld Westbu. 54Plainview: 54 mg/LPlainview 54East Hills: 56 mg/LEast Hills 5645 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 45 mg/L, Oyster Bay is 14 mg/L above the typical New York figure of 31. Of the 10 nearest cities we track, 3 have softer water and 6 have harder. The range nearby runs from 18 mg/L in Hicksville to 59 in Port Washington.

What 45 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 45 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 Oyster Bay's water system

Oyster Bay WD · PWSID NY2902844

No health-based violations since 2016

Serves about 8,700 people from groundwater.

Health-based
0
Monitoring or reporting
1
Open now
0

EPA lists this system as serving Oyster Bay.

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 Oyster Bay water hard?

No. It measures about 45 mg/L (2.6 grains per gallon), which the USGS classes as soft.

What is the water hardness in Oyster Bay in grains per gallon?

About 2.6 gpg. One grain per gallon equals 17.1 mg/L, so 45 mg/L divided by 17.1 gives 2.6.

Has the Oyster Bay water system had EPA violations?

EPA records show no health-based violations for Oyster Bay WD 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 (calculated from utility data, February 10, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.