Water Hardness in Madison, NJ
New Jersey · 1 zip codes · 14 matched water systems
City avg (weighted): 148 PPM
Dataset updated March 9, 202614 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Madison, NJ Water Hard or Soft?
The displayed hardness for Madison, NJ is 40 PPM (2.3 GPG) from Nj American Water - Short Hills, classified as soft. The citywide weighted average is 148 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
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.
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 Madison
These systems are matched to Madison, NJ. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Nj American Water - Short Hills NJ0712001 | surface water | 40 PPM SoftUSGS estimate: 188 PPM | |
| Southeast Morris County Mua NJ1424001 | surface water | 114 PPM Slightly Hard | |
| Parsippany-Troy Hills Water Department NJ1429001 | surface water | 359 PPM Very HardUSGS estimate: 114 PPM | |
| Dover Water Commission NJ1409001 | groundwater | 278 PPM Very Hard | |
| Montville Twp Mua NJ1421003 | surface water | 118 PPM Slightly Hard |
Zip Codes in Madison, NJ
What This Means For You
Use this city reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.
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 Madison, NJ.
Frequently Asked Questions
How hard is the water in Madison, NJ?
The citywide weighted average water hardness in Madison, 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 Madison, NJ?
With a citywide average hardness of 148 PPM, a water softener is worth considering for homes in Madison. Confirm your tap reading before sizing equipment.
Is hard water in Madison, 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 Madison, NJ?
Madison, New Jersey is served by 14 matched water systems across 1 zip code.
Learn More About Your Water
Water Hardness Scale: PPM and GPG Chart
Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.
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Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
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