State distribution
Hardness across indexed ZIPs
Counts describe published ZIP profiles, not a population-weighted statewide sample.
Soft · 0–60 PPM26
Moderately hard · 61–120 PPM31
Hard · 121–180 PPM13
Very hard · 181+ PPM14
State water index
New Jersey water hardness
Search 60 indexed communities and 84 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.
Median regional evidence
80PPM
Moderately Hard
Indexed range 12.6–296.5 PPM
- ZIP profiles
- 84
- Cities
- 60
- Matched utilities
- 60
- Counties
- 18
Understanding New Jersey
Why local comparisons matter here
New Jersey includes northern reservoir and bedrock settings, central river systems, and extensive Coastal Plain aquifers in the south.
In this index, moderately hard is the largest category, covering 31 of 84 profiles with hardness data. The state median is 80 PPM, but the full indexed range is 12.6–296.5 PPM.
Evidence coverage
What the current records support
- Hardness estimate
- 100%
- Lead 90th percentile
- 100%
- Copper 90th percentile
- 7%
0
Low-confidence hardness profiles
83
Research-comparison eligible profiles
Reported source water
Utility source mix
- Groundwater
- 32
- Surface water
- 28
Highest medians
Highest eligible city medians
- 1. Newark122 PPM
- 2. Camden78 PPM
- 3. Trenton75 PPM
Lowest medians
Lowest eligible city medians
- 1. Trenton75 PPM
- 2. Camden78 PPM
- 3. Newark122 PPM
City directory
Explore New Jersey by city
Search by city or county, then sort by name, hardness, or ZIP coverage.
60 cities · 84 ZIP profiles
60 cities found
Page 1 of 3
Atlantic Highlands
Monmouth County · 1 ZIP
67PPM regional
Single regional valueNo active flag
Avalon
Cape May County · 1 ZIP
72PPM regional
Single regional valueNo active flag
Barnegat Light
Ocean County · 1 ZIP
16PPM regional
Single regional valueNo active flag
Beach Haven
Ocean County · 1 ZIP
15PPM regional
Single regional valueNo active flag
Beachwood
Ocean County · 1 ZIP
27PPM regional
Single regional valueNo active flag
Bellmawr
Camden County · 1 ZIP
46PPM regional
Single regional valueNo active flag
Belmar
Monmouth County · 1 ZIP
42PPM regional
Single regional valueNo active flag
Berlin
Camden County · 1 ZIP
30PPM regional
Single regional valueNo active flag
Boonton
Morris County · 1 ZIP
127PPM regional
Single regional valueNo active flag
Bordentown
Burlington County · 1 ZIP
77PPM regional
Single regional valueNo active flag
Bridgeton
Cumberland County · 1 ZIP
43PPM regional
Single regional valueNo active flag
Brielle
Monmouth County · 1 ZIP
41PPM regional
Single regional valueNo active flag
Brigantine
Atlantic County · 1 ZIP
13PPM regional
Single regional valueNo active flag
Burlington
Burlington County · 1 ZIP
57PPM regional
Single regional valueNo active flag
Camden
Camden County · 5 ZIPs
78PPM regional
Regional range 72.1–81.1No active flag
Clinton
Hunterdon County · 1 ZIP
177PPM regional
Single regional valueNo active flag
Dover
Morris County · 1 ZIP
267PPM regional
Single regional valueNo active flag
East Orange
Essex County · 2 ZIPs
229PPM regional
Regional range 228–229No active flag
Flemington
Hunterdon County · 1 ZIP
192PPM regional
Single regional valueNo active flag
Florham Park
Morris County · 2 ZIPs
238PPM regional
Regional range 229–246No active flag
Garfield
Bergen County · 1 ZIP
118PPM regional
Single regional valueNo active flag
Glassboro
Gloucester County · 1 ZIP
50PPM regional
Single regional valueNo active flag
Hammonton
Atlantic County · 1 ZIP
29PPM regional
Single regional valueNo active flag
Hawthorne
Passaic County · 1 ZIP
280PPM regional
Single regional valueNo active flag
County comparison
Highest regional-evidence county medians
| County | Median | Range | ZIP profiles |
|---|---|---|---|
| Sussex County | 274 PPM | 95–279 | 3 |
| Morris County | 228 PPM | 123–280 | 8 |
| Passaic County | 194 PPM | 108–280 | 2 |
| Hunterdon County | 185 PPM | 177–192 | 2 |
| Hudson County | 127 PPM | 125.5–135 | 3 |
| Essex County | 122 PPM | 108–229 | 13 |
| Bergen County | 118 PPM | 96.3–296.5 | 7 |
| Union County | 92 PPM | 92.1–92.1 | 1 |
| Camden County | 78 PPM | 30.3–81.1 | 7 |
| Mercer County | 75 PPM | 69.9–80.9 | 7 |
| Cape May County | 72 PPM | 71.5–73 | 2 |
| Middlesex County | 72 PPM | 72.4–72.4 | 1 |