Tarrytown, NY water hardness

Tap water hardness
19mg/L
1.1gpg
Soft

Reported by Tarrytown Water Supply · January 2025

NY typical
31 mg/L
EPA health violations since 2016
3
Data
Utility report

Tap water in Tarrytown has about 19 mg/L of hardness, which is 1.1 grains per gallon. On the USGS scale that counts as soft. The number comes from Tarrytown Water Supply, dated January 2025.

Tarrytown on the hardness scale, with nearby cities
060120180240300360+NY typical 31Irvington: 6 mg/LIrvington 6Scarsdale: 13 mg/LScarsdale 13Eastchester: 14 mg/LEastchester 14Elmsford: 17 mg/LElmsford 17Greenville: 17 mg/LGreenville 17White Plains: 21 mg/LWhite Plains 21Sleepy Hollow: 22 mg/LSleepy Hollow 22Briarcliff Manor: 30 mg/LBriarcliff Manor 30Pleasantville: 32 mg/LPleasantville 32Ossining: 103 mg/LOssining 103Tarrytown 19mg/L as calcium carbonate060120180240300360+NY 31Irvington: 6 mg/LIrvington 6Elmsford: 17 mg/LElmsford 17Greenville: 17 mg/LGreenville 17Sleepy Hollow: 22 mg/LSleepy Hol. 22Briarcliff Manor: 30 mg/LBriarcliff. 30Ossining: 103 mg/LOssining 10319 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Tarrytown sits 12 mg/L below the typical New York figure of 31. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 6 mg/L in Irvington to 103 in Ossining.

What 19 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 19 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 Tarrytown's water system

Tarrytown Water Supply · PWSID NY5903461

3 health-based violations since 2016

Serves about 11,000 people from surface water.

Health-based
3
Monitoring or reporting
3
Open now
0
20162017201820192020202120222023202420252026Haloacetic acids (HAA5)'16'18'20'22'24'26Haloacetic acids (HAA5)
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Haloacetic acids (HAA5)a disinfection byproduct32021–2022Resolved

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 Tarrytown water hard?

No. It measures about 19 mg/L (1.1 grains per gallon), which the USGS classes as soft.

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

About 1.1 gpg. One grain per gallon equals 17.1 mg/L, so 19 mg/L divided by 17.1 gives 1.1.

Has the Tarrytown water system had EPA violations?

EPA records show 3 health-based violations for Tarrytown Water Supply since 2016, involving Haloacetic acids (HAA5). There were also 3 monitoring or reporting violations, 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, January 27, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.