Smithtown, NY water hardness

Tap water hardness
46mg/L
2.7gpg
Soft

Reported by Smithtown Water District · September 2025

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

The water in Smithtown carries roughly 46 mg/L of dissolved calcium and magnesium, or 2.7 grains per gallon. That is soft water. The number comes from Smithtown Water District, dated September 2025.

Smithtown on the hardness scale, with nearby cities
060120180240300360+NY typical 31East Farmingdale: 10 mg/LEast Farmingdale 10North Lindenhurst: 10 mg/LNorth Lindenhurst 10Dix Hills: 21 mg/LDix Hills 21Huntington: 21 mg/LHuntington 21Greenlawn: 31 mg/LGreenlawn 31Babylon: 33 mg/LBabylon 33Kings Park: 46 mg/LKings Park 46Fort Salonga: 70 mg/LFort Salonga 70Northport: 70 mg/LNorthport 70Hauppauge: 85 mg/LHauppauge 85Smithtown 46mg/L as calcium carbonate060120180240300360+NY 31Dix Hills: 21 mg/LDix Hills 21Greenlawn: 31 mg/LGreenlawn 31Kings Park: 46 mg/LKings Park 46Fort Salonga: 70 mg/LFort Salon. 70Northport: 70 mg/LNorthport 70Hauppauge: 85 mg/LHauppauge 8546 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Smithtown sits 15 mg/L above the typical New York figure of 31. Of the 10 nearest cities we track, 6 have softer water and 3 have harder. The range nearby runs from 10 mg/L in East Farmingdale to 85 in Hauppauge.

What 46 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 46 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 Smithtown's water system

Smithtown Water District · PWSID NY5105656

No health-based violations since 2016

Serves about 19,635 people from groundwater.

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 Smithtown water hard?

No. It measures about 46 mg/L (2.7 grains per gallon), which the USGS classes as soft.

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

About 2.7 gpg. One grain per gallon equals 17.1 mg/L, so 46 mg/L divided by 17.1 gives 2.7.

Has the Smithtown water system had EPA violations?

EPA records show no health-based violations for Smithtown Water District since 2016.

Nearby cities

All 149 cities in New York

Hardness data: TapWaterData US Water Hardness (utility report, September 8, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.