How hard is the water in Old Bridge, NJ?

Tap water hardness
69mg/L
4.0gpg
Moderately hard

Reported by Old Bridge MUA · April 2025

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

The water in Old Bridge carries roughly 69 mg/L of dissolved calcium and magnesium, or 4.0 grains per gallon. That is moderately hard water. The number comes from Old Bridge MUA, dated April 2025.

Old Bridge on the hardness scale, with nearby cities
060120180240300360+NJ typical 80Robertsville: 29 mg/LRobertsville 29Morganville: 29 mg/LMorganville 29Matawan: 59 mg/LMatawan 59Strathmore: 64 mg/LStrathmore 64Sayreville: 66 mg/LSayreville 66Milltown: 66 mg/LMilltown 66Madison Park: 69 mg/LMadison Park 69Laurence Harbor: 69 mg/LLaurence Harbor 69Yorketown: 91 mg/LYorketown 91Jamesburg: 100 mg/LJamesburg 100Old Bridge 69mg/L as calcium carbonate060120180240300360+NJ 80Robertsville: 29 mg/LRobertsvil. 29Morganville: 29 mg/LMorganville 29Matawan: 59 mg/LMatawan 59Sayreville: 66 mg/LSayreville 66Madison Park: 69 mg/LMadison Pa. 69Laurence Harbor: 69 mg/LLaurence H. 6969 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 69 mg/L, Old Bridge is 11 mg/L below the typical New Jersey figure of 80. Of the 10 nearest cities we track, 6 have softer water and 2 have harder. The range nearby runs from 29 mg/L in Robertsville to 100 in Jamesburg.

What 69 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 Old Bridge

3 people × 75 gallons a day × 4.0 gpg = 902 grains a day. A 24,000-grain unit regenerates about every 26 days.

Size it for your household

EPA record for Old Bridge's water system

Old Bridge MUA · PWSID NJ1209002

No health-based violations since 2016

Serves about 68,000 people from surface water.

Health-based
0
Monitoring or reporting
16
Open now
1

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 Old Bridge water hard?

Somewhat. It measures about 69 mg/L (4.0 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Old Bridge in grains per gallon?

About 4.0 gpg. One grain per gallon equals 17.1 mg/L, so 69 mg/L divided by 17.1 gives 4.0.

What size water softener do I need in Old Bridge?

For 3 people using 75 gallons each per day, 4.0 gpg works out to about 902 grains a day. A 24,000-grain softener covers that with a regeneration about every 26 days.

Has the Old Bridge water system had EPA violations?

EPA records show no health-based violations for Old Bridge MUA since 2016. There were also 16 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, April 13, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.