How hard is the water in Metuchen, NJ?

Tap water hardness
108mg/L
6.3gpg
Moderately hard

Reported by Middlesex Water Company · October 2025

NJ typical
80 mg/L
EPA health violations since 2016
1
Softener for 3 people
24k grain
Data
Utility report

The water in Metuchen carries roughly 108 mg/L of dissolved calcium and magnesium, or 6.3 grains per gallon. That is moderately hard water. The number comes from Middlesex Water Company, dated October 2025.

Metuchen on the hardness scale, with nearby cities
060120180240300360+NJ typical 80Highland Park: 63 mg/LHighland Park 63Sayreville: 66 mg/LSayreville 66Perth Amboy: 84 mg/LPerth Amboy 84Rutgers University-Busch Campus: 100 mg/LRutgers University-Busch Campus 100South Plainfield: 102 mg/LSouth Plainfield 102Fords: 108 mg/LFords 108Iselin: 108 mg/LIselin 108Woodbridge: 108 mg/LWoodbridge 108Colonia: 108 mg/LColonia 108Avenel: 108 mg/LAvenel 108Metuchen 108mg/L as calcium carbonate060120180240300360+NJ 80Highland Park: 63 mg/LHighland P. 63South Plainfield: 102 mg/LSouth Plai. 102Fords: 108 mg/LFords 108Iselin: 108 mg/LIselin 108Woodbridge: 108 mg/LWoodbridge 108Colonia: 108 mg/LColonia 108108 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 108 mg/L, Metuchen is 28 mg/L above the typical New Jersey figure of 80. None of the 10 nearest cities we track has harder water. The range nearby runs from 63 mg/L in Highland Park to 108 in Fords.

What 108 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 Metuchen

3 people × 75 gallons a day × 6.3 gpg = 1,422 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Metuchen's water system

Middlesex Water Company · PWSID NJ1225001

1 health-based violation since 2016

Serves about 233,376 people from surface water.

Health-based
1
Monitoring or reporting
9
Open now
0

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

20162017201820192020202120222023202420252026Lead and Copper Rule'16'18'20'22'24'26Lead and Copper Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Lead and Copper Rulecorrosion control and lead sampling12019Resolved

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 Metuchen water hard?

Somewhat. It measures about 108 mg/L (6.3 grains per gallon), which the USGS classes as moderately hard.

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

About 6.3 gpg. One grain per gallon equals 17.1 mg/L, so 108 mg/L divided by 17.1 gives 6.3.

What size water softener do I need in Metuchen?

For 3 people using 75 gallons each per day, 6.3 gpg works out to about 1,422 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Metuchen water system had EPA violations?

EPA records show 1 health-based violation for Middlesex Water Company since 2016, involving Lead and Copper Rule. There were also 9 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 227 cities in New Jersey

Hardness data: TapWaterData US Water Hardness (utility report, October 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.