Hard water in Waldwick, NJ

Tap water hardness
256mg/L
15.0gpg
Very hard

Reported by Waldwick Water Dept · October 2025

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

Waldwick water measures 256 mg/L (15.0 gpg) of hardness, very hard by USGS standards. The number comes from Waldwick Water Dept, dated October 2025.

Waldwick on the hardness scale, with nearby cities
060120180240300360+NJ typical 80Hawthorne: 5 mg/LHawthorne 5Upper Saddle River: 96 mg/LUpper Saddle River 96Hillsdale: 96 mg/LHillsdale 96Franklin Lakes: 98 mg/LFranklin Lakes 98Midland Park: 105 mg/LMidland Park 105Ridgewood: 105 mg/LRidgewood 105Glen Rock: 105 mg/LGlen Rock 105Ramsey: 131 mg/LRamsey 131Woodcliff Lake: 313 mg/LWoodcliff Lake 313Park Ridge: 313 mg/LPark Ridge 313Waldwick 256mg/L as calcium carbonate060120180240300360+NJ 80Upper Saddle River: 96 mg/LUpper Sadd. 96Midland Park: 105 mg/LMidland Pa. 105Ridgewood: 105 mg/LRidgewood 105Glen Rock: 105 mg/LGlen Rock 105Ramsey: 131 mg/LRamsey 131Woodcliff Lake: 313 mg/LWoodcliff. 313256 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Waldwick sits 176 mg/L above the typical New Jersey figure of 80. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 5 mg/L in Hawthorne to 313 in Woodcliff Lake.

What 256 mg/L means at home

Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.

Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.

Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.

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

At 256 mg/L most of the trouble is scale, and only a few things deal with it.

Ion-exchange water softener

The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.

Salt-free conditioner

No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.

Reverse osmosis or carbon filter

Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.

Softener size for Waldwick

3 people × 75 gallons a day × 15.0 gpg = 3,368 grains a day. A 24,000-grain unit regenerates about every 7 days.

Size it for your household

EPA record for Waldwick's water system

Waldwick Water Dept · PWSID NJ0264001

No health-based violations since 2016

Serves about 10,208 people from groundwater.

Health-based
0
Monitoring or reporting
186
Open now
0

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 Waldwick water hard?

Yes. It measures about 256 mg/L (15.0 grains per gallon), which the USGS classes as very hard.

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

About 15.0 gpg. One grain per gallon equals 17.1 mg/L, so 256 mg/L divided by 17.1 gives 15.0.

What size water softener do I need in Waldwick?

For 3 people using 75 gallons each per day, 15.0 gpg works out to about 3,368 grains a day. A 24,000-grain softener covers that with a regeneration about every 7 days.

Has the Waldwick water system had EPA violations?

EPA records show no health-based violations for Waldwick Water Dept since 2016. There were also 186 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 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.