Water Hardness in Cedar Knolls, NJ

Q: Do I need a water softener in Cedar Knolls, NJ?

With a citywide weighted average hardness of 148 PPM, a water softener is worth considering for homes in Cedar Knolls. Consider a water softener or conditioner to reduce scale buildup.

Q: How many water systems serve Cedar Knolls, NJ?

Cedar Knolls, New Jersey has 14 matched water systems across 1 zip code.

New Jersey · 1 zip codes · 14 matched water systems

40 PPM

2.3 GPG

Soft

0Soft60120180300+

Verified — Annual Water Quality Report

City avg (weighted): 148 PPM

Dataset updated March 9, 202614 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

Nj American Water - Short Hills

NJ0712001

Water source: surface water

Serves: 217,230

USGS environmental estimate: 188 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 14 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

2 verified treated-water sources

14 matched systems total for this city; treated-water reports are prioritized when available.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems in Cedar Knolls

These systems are matched to Cedar Knolls, NJ. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

14 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Nj American Water - Short Hills NJ0712001	surface water	40 PPM Soft USGS estimate: 188 PPM	217,230	Verified — Annual Water Quality Report
Southeast Morris County Mua NJ1424001	surface water	114 PPM Slightly Hard	62,349	High Confidence — USGS Monitoring
Parsippany-Troy Hills Water Department NJ1429001	surface water	359 PPM Very Hard USGS estimate: 114 PPM	50,400	Verified — Annual Water Quality Report
Dover Water Commission NJ1409001	groundwater	278 PPM Very Hard	27,806	High Confidence — USGS Monitoring
Montville Twp Mua NJ1421003	surface water	118 PPM Slightly Hard	22,000	High Confidence — USGS Monitoring

Nj American Water - Short Hills

NJ0712001

Soft

40 PPMsurface water217,230 servedVerified — Annual Water Quality Report

Source water: 188 PPM

Southeast Morris County Mua

NJ1424001

Slightly Hard

114 PPMsurface water62,349 servedHigh Confidence — USGS Monitoring

Parsippany-Troy Hills Water Department

NJ1429001

Very Hard

359 PPMsurface water50,400 servedVerified — Annual Water Quality Report

Source water: 114 PPM

Dover Water Commission

NJ1409001

Very Hard

278 PPMgroundwater27,806 servedHigh Confidence — USGS Monitoring

Montville Twp Mua

NJ1421003

Slightly Hard

118 PPMsurface water22,000 servedHigh Confidence — USGS Monitoring

Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Cedar Knolls, NJ

07927148

What This Means For You

Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft water!

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Cedar Knolls, NJ.

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Frequently Asked Questions

How hard is the water in Cedar Knolls, NJ?

The citywide weighted average water hardness in Cedar Knolls, NJ is 148 PPM (8.6 GPG), classified as moderately hard. This is based on 14 matched water systems. The gauge highlights Nj American Water - Short Hills, a verified treated-water system, because individual systems can differ from the citywide average.

Do I need a water softener in Cedar Knolls, NJ?

With a citywide average hardness of 148 PPM, a water softener is worth considering for homes in Cedar Knolls. Confirm your tap reading before sizing equipment.

Is hard water in Cedar Knolls, NJ safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve Cedar Knolls, NJ?

Cedar Knolls, New Jersey is served by 14 matched water systems across 1 zip code.

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