How hard is the water in Hauppauge, NY?

Tap water hardness
85mg/L
5.0gpg
Moderately hard

Reported by Riverside WD · June 2025

NY typical
31 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Hauppauge water measures 85 mg/L (5.0 gpg) of hardness, moderately hard by USGS standards. The number comes from Riverside WD, dated June 2025.

Hauppauge 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 33Smithtown: 46 mg/LSmithtown 46Kings Park: 46 mg/LKings Park 46Fort Salonga: 70 mg/LFort Salonga 70Northport: 70 mg/LNorthport 70Hauppauge 85mg/L as calcium carbonate060120180240300360+NY 31Dix Hills: 21 mg/LDix Hills 21Greenlawn: 31 mg/LGreenlawn 31Smithtown: 46 mg/LSmithtown 46Kings Park: 46 mg/LKings Park 46Fort Salonga: 70 mg/LFort Salon. 70Northport: 70 mg/LNorthport 7085 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Hauppauge sits 54 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 10 mg/L in East Farmingdale to 70 in Fort Salonga.

What 85 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Hauppauge

3 people × 75 gallons a day × 5.0 gpg = 1,120 grains a day. A 24,000-grain unit regenerates about every 21 days.

Size it for your household

EPA record for Hauppauge's water system

Riverside Water District · PWSID NY5105655

No health-based violations since 2016

Serves about 2,050 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 Hauppauge water hard?

Somewhat. It measures about 85 mg/L (5.0 grains per gallon), which the USGS classes as moderately hard.

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

About 5.0 gpg. One grain per gallon equals 17.1 mg/L, so 85 mg/L divided by 17.1 gives 5.0.

What size water softener do I need in Hauppauge?

For 3 people using 75 gallons each per day, 5.0 gpg works out to about 1,120 grains a day. A 24,000-grain softener covers that with a regeneration about every 21 days.

Has the Hauppauge water system had EPA violations?

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

Nearby cities

All 149 cities in New York

Hardness data: TapWaterData US Water Hardness (utility report, June 11, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.