Water Hardness in New Jersey (NJ)
New Jersey has an average water hardness of 120 ppm (7 grains per gallon), which is classified as Slightly Hard . At this level, New Jersey residents experience minimal hard water issues. A water softener is generally not necessary, though some homeowners prefer the feel and cleaning performance of softened water. Water hardness varies between cities — from 30 ppm in Newark to 175 ppm in Cherry Hill.
Water Hardness by City in New Jersey
The table below shows water hardness data for 8 cities in New Jersey, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Cherry Hill | 175 ppm | 10.2 gpg | Moderately Hard | Ground | 7.7 | 275 | New Jersey American Water |
| Atlantic City | 155 ppm | 9.1 gpg | Moderately Hard | Ground | 7.6 | 245 | Atlantic City Municipal Utilities Authority |
| Toms River | 140 ppm | 8.2 gpg | Moderately Hard | Ground | 7.5 | 220 | New Jersey American Water |
| Trenton | 110 ppm | 6.4 gpg | Slightly Hard | Mixed | 7.4 | 170 | Trenton Water Works |
| Woodbridge | 100 ppm | 5.8 gpg | Slightly Hard | Mixed | 7.3 | 155 | Middlesex Water Company |
| Edison | 90 ppm | 5.3 gpg | Slightly Hard | Mixed | 7.3 | 140 | Middlesex Water Company |
| Jersey City | 35 ppm | 2 gpg | Soft | Surface | 7.1 | 55 | Suez Water New Jersey |
| Newark | 30 ppm | 1.8 gpg | Soft | Surface | 7 | 48 | City of Newark Water Department |
Understanding Water Hardness in New Jersey
Water Sources in New Jersey
Many cities in New Jersey rely on groundwater from wells and aquifers as their primary water source. Groundwater tends to be harder than surface water because it spends more time in contact with limestone, dolomite, and other mineral-rich rock formations deep underground. This prolonged contact allows more calcium and magnesium to dissolve into the water, resulting in higher hardness levels.
Hardness Variation Across New Jersey
Water hardness in New Jersey ranges from 30 ppm in Newark to 175 ppm in Cherry Hill — a difference of 145 ppm. This variation means that treatment recommendations differ significantly between cities. Even the hardest water in New Jersey is moderate enough that a water softener is optional rather than essential, though homeowners who value spotless dishes and softer-feeling water may still find one worthwhile. Meanwhile, Newark enjoys naturally soft water that needs no treatment at all — an advantage that saves residents money on both equipment and ongoing maintenance.
Recommended Treatment for New Jersey Water
Based on the average water hardness of 120 ppm in New Jersey, a water softener is not strictly necessary, but some homeowners may prefer treated water. The most effective treatment options for New Jersey's water hardness level include:
- Ion Exchange Filter Pitcher ($30 - $60) — Removes hardness minerals. Moderately effective.
- Electronic Descaler ($150 - $400) — Conditions water without removing minerals. Moderately effective.
How New Jersey Compares to Other States
Below is a comparison of New Jersey with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| New Jersey (NJ) | 120 ppm | Slightly Hard | 8 |
| District of Columbia (DC) | 120 ppm | Slightly Hard | 7 |
| West Virginia (WV) | 120 ppm | Slightly Hard | 8 |
| Maryland (MD) | 115 ppm | Slightly Hard | 7 |
| Delaware (DE) | 110 ppm | Slightly Hard | 7 |
| Kentucky (KY) | 130 ppm | Moderately Hard | 8 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in New Jersey, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.