Malverne, NY water hardness

Tap water hardness
51mg/L
3.0gpg
Soft

Reported by WA of Western Nassau · October 2025

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

The water in Malverne carries roughly 51 mg/L of dissolved calcium and magnesium, or 3.0 grains per gallon. That is soft water. The number comes from WA of Western Nassau, dated October 2025.

Malverne on the hardness scale, with nearby cities
060120180240300360+NY typical 31Lynbrook: 32 mg/LLynbrook 32Lakeview: 39 mg/LLakeview 39Rockville Centre: 39 mg/LRockville Centre 39Oceanside: 42 mg/LOceanside 42Franklin Square: 48 mg/LFranklin Square 48West Hempstead: 48 mg/LWest Hempstead 48Hempstead: 53 mg/LHempstead 53North Valley Stream: 55 mg/LNorth Valley Stream 55Elmont: 55 mg/LElmont 55Floral Park: 55 mg/LFloral Park 55Malverne 51mg/L as calcium carbonate060120180240300360+NY 31Lynbrook: 32 mg/LLynbrook 32Lakeview: 39 mg/LLakeview 39Rockville Centre: 39 mg/LRockville. 39Franklin Square: 48 mg/LFranklin S. 48West Hempstead: 48 mg/LWest Hemps. 48North Valley Stream: 55 mg/LNorth Vall. 5551 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 51 mg/L, Malverne is 20 mg/L above the typical New York figure of 31. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 32 mg/L in Lynbrook to 55 in North Valley Stream.

What 51 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 51 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 Malverne'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 Malverne to this system. EPA's service-area records do not name Malverne, 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 Malverne water hard?

No. It measures about 51 mg/L (3.0 grains per gallon), which the USGS classes as soft.

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

About 3.0 gpg. One grain per gallon equals 17.1 mg/L, so 51 mg/L divided by 17.1 gives 3.0.

Has the Malverne 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.