How hard is the water in Westmont, NJ?

Tap water hardness
101mg/L
5.9gpg
Moderately hard

Reported by Collingswood Water Depar · October 2025

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

The water in Westmont carries roughly 101 mg/L of dissolved calcium and magnesium, or 5.9 grains per gallon. That is moderately hard water. The number comes from Collingswood Water Depar, dated October 2025.

Westmont on the hardness scale, with nearby cities
060120180240300360+NJ typical 80Cherry Hill Mall: 78 mg/LCherry Hill Mall 78Haddonfield: 82 mg/LHaddonfield 82Audubon: 82 mg/LAudubon 82Haddon Heights: 82 mg/LHaddon Heights 82Ellisburg: 82 mg/LEllisburg 82Barrington: 82 mg/LBarrington 82Ashland: 82 mg/LAshland 82Camden: 82 mg/LCamden 82Kingston Estates: 82 mg/LKingston Estates 82Collingswood: 97 mg/LCollingswood 97Westmont 101mg/L as calcium carbonate060120180240300360+NJ 80Haddonfield: 82 mg/LHaddonfield 82Audubon: 82 mg/LAudubon 82Haddon Heights: 82 mg/LHaddon Hei. 82Ellisburg: 82 mg/LEllisburg 82Barrington: 82 mg/LBarrington 82Collingswood: 97 mg/LCollingswo. 97101 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Westmont sits 21 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 78 mg/L in Cherry Hill Mall to 97 in Collingswood.

What 101 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 Westmont

3 people × 75 gallons a day × 5.9 gpg = 1,325 grains a day. A 24,000-grain unit regenerates about every 18 days.

Size it for your household

EPA record for Westmont's water system

Collingswood Water Depar · PWSID NJ0412001

No health-based violations since 2016

Serves about 24,500 people from groundwater.

Health-based
0
Monitoring or reporting
1
Open now
0

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

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 Westmont water hard?

Somewhat. It measures about 101 mg/L (5.9 grains per gallon), which the USGS classes as moderately hard.

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

About 5.9 gpg. One grain per gallon equals 17.1 mg/L, so 101 mg/L divided by 17.1 gives 5.9.

What size water softener do I need in Westmont?

For 3 people using 75 gallons each per day, 5.9 gpg works out to about 1,325 grains a day. A 24,000-grain softener covers that with a regeneration about every 18 days.

Has the Westmont water system had EPA violations?

EPA records show no health-based violations for Collingswood Water Depar since 2016. There were also 1 monitoring or reporting violation, 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 11, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.