Hempstead, NY water hardness

Tap water hardness
53mg/L
3.1gpg
Soft

Reported by WA of Western Nassau · October 2025

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

Hempstead water measures 53 mg/L (3.1 gpg) of hardness, soft by USGS standards. The number comes from WA of Western Nassau, dated October 2025.

Hempstead on the hardness scale, with nearby cities
060120180240300360+NY typical 31Roosevelt: 33 mg/LRoosevelt 33Lakeview: 39 mg/LLakeview 39Rockville Centre: 39 mg/LRockville Centre 39North Merrick: 42 mg/LNorth Merrick 42West Hempstead: 48 mg/LWest Hempstead 48Franklin Square: 48 mg/LFranklin Square 48Uniondale: 51 mg/LUniondale 51Garden City: 51 mg/LGarden City 51Mineola: 51 mg/LMineola 51Carle Place: 51 mg/LCarle Place 51Hempstead 53mg/L as calcium carbonate060120180240300360+NY 31Roosevelt: 33 mg/LRoosevelt 33Lakeview: 39 mg/LLakeview 39Rockville Centre: 39 mg/LRockville. 39West Hempstead: 48 mg/LWest Hemps. 48Uniondale: 51 mg/LUniondale 51Garden City: 51 mg/LGarden City 5153 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 53 mg/L, Hempstead is 22 mg/L above the typical New York figure of 31. None of the 10 nearest cities we track has harder water. The range nearby runs from 33 mg/L in Roosevelt to 51 in Uniondale.

What 53 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 53 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 Hempstead's water system

Town of Hempstead Water Department · PWSID NY2900000

No health-based violations since 2016

Serves about 110,000 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists Town of Hempstead Water Department as the system serving Hempstead. The hardness figure above comes from a different system's report, which TapWaterData uses for Hempstead.

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 Hempstead water hard?

No. It measures about 53 mg/L (3.1 grains per gallon), which the USGS classes as soft.

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

About 3.1 gpg. One grain per gallon equals 17.1 mg/L, so 53 mg/L divided by 17.1 gives 3.1.

Has the Hempstead water system had EPA violations?

EPA records show no health-based violations for Town of Hempstead Water Department since 2016.

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.