Harrison, NY water hardness

Tap water hardness
17mg/L
1.0gpg
SoftReports range 17–28

Reported by Westchester Joint Water Works · October 2025

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

Tap water in Harrison has about 17 mg/L of hardness, which is 1.0 grains per gallon. On the USGS scale that counts as soft. The number comes from Westchester Joint Water Works, dated October 2025. Reports for this system disagree, with values from 17 to 28 mg/L.

Harrison on the hardness scale, with nearby cities
060120180240300360+NY typical 31Mamaroneck: 6 mg/LMamaroneck 6Larchmont: 6 mg/LLarchmont 6New Rochelle: 6 mg/LNew Rochelle 6Irvington: 6 mg/LIrvington 6Scarsdale: 13 mg/LScarsdale 13Eastchester: 14 mg/LEastchester 14Tuckahoe: 14 mg/LTuckahoe 14Elmsford: 17 mg/LElmsford 17Greenville: 17 mg/LGreenville 17White Plains: 21 mg/LWhite Plains 21Harrison 17mg/L as calcium carbonate060120180240300360+NY 31Mamaroneck: 6 mg/LMamaroneck 6Scarsdale: 13 mg/LScarsdale 13Eastchester: 14 mg/LEastchester 14Elmsford: 17 mg/LElmsford 17Greenville: 17 mg/LGreenville 17White Plains: 21 mg/LWhite Plai. 2117 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Harrison sits 14 mg/L below the typical New York figure of 31. Of the 10 nearest cities we track, 7 have softer water and 1 has harder. The range nearby runs from 6 mg/L in Mamaroneck to 21 in White Plains.

What 17 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 17 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 Harrison's water system

Westchester Joint Water Works · PWSID NY5903435

3 health-based violations since 2016

Serves about 59,629 people from surface water.

Health-based
3
Monitoring or reporting
0
Open now
0

TapWaterData ties Harrison to this system. EPA's service-area records do not name Harrison, so check the utility printed on your water bill.

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 byproduct32019Resolved

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 Harrison water hard?

No. It measures about 17 mg/L (1.0 grains per gallon), which the USGS classes as soft.

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

About 1.0 gpg. One grain per gallon equals 17.1 mg/L, so 17 mg/L divided by 17.1 gives 1.0.

Has the Harrison water system had EPA violations?

EPA records show 3 health-based violations for Westchester Joint Water Works since 2016, involving Haloacetic acids (HAA5).

Nearby cities

All 149 cities in New York

Hardness data: TapWaterData US Water Hardness (utility report, October 16, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.