Well Water in New Jersey
Contaminant risks, testing requirements, and treatment recommendations for private well owners in New Jersey.
New Jersey Geology and Groundwater
New Jersey sits on Coastal Plain and Piedmont sediments. This geology directly determines what contaminants are likely in private well water. Based on this geology, New Jersey well owners face elevated risk for PFAS from industrial/military sites. Moderate risk exists for arsenic, radon, nitrate.
Contaminant Risk Profile
| Contaminant | Risk Level | Why |
|---|---|---|
| Arsenic | Moderate risk | Some geological zones have elevated levels. Test recommended. |
| Nitrate | Moderate risk | Some areas near farmland or septic systems may have elevated levels. |
| Radon | Moderate risk | Some bedrock types in this state produce radon. |
| PFAS | Elevated risk | Military bases, industrial sites, or manufacturing in this state have contaminated groundwater. |
| Iron/Manganese | Moderate risk | Found in some wells depending on local geology. |
How New Jersey Compares: Municipal Water Data
CheckMyTap tracks water quality for 22 cities in New Jersey. While these numbers reflect municipal water (not private wells), they indicate the baseline mineral content of New Jersey's water sources. Private wells often draw from the same aquifers but with less treatment.
| Metric | New Jersey Average | National Average |
|---|---|---|
| Hardness | 45 PPM (soft) | 170 PPM |
| Hardness range | 25 - 70 PPM | 25 - 400+ PPM |
| Lead (avg municipal) | 3.2 ppb | 3.2 ppb |
| Nitrate (avg municipal) | 1 mg/L | 1.1 mg/L |
| Cities with PFAS detected | 19 of 22 | ~45% nationally |
| Cities exceeding PFAS MCL (4 ppt) | 19 |
Hardest water in New Jersey: Princeton (70 PPM), Elizabeth (64 PPM), Hoboken (61 PPM), Morristown (60 PPM), Hackensack (60 PPM).
Softest water: Atlantic City (25 PPM), Trenton (27 PPM), Lakewood (28 PPM).
Testing Requirements in New Jersey
New Jersey requires well water testing at property transfer. Private Well Testing Act requires testing for 28+ parameters at property transfer. Regardless of state requirements, the EPA recommends testing annually for:
- Every year: Total coliform bacteria, E. coli, nitrate, pH, and total dissolved solids
- At least once: Arsenic, lead, copper, fluoride, and any contaminant identified as a local risk
- Recommended for New Jersey: Radon in water (granitic bedrock states have higher risk)
- Recommended for New Jersey: PFAS panel, especially if near military bases or industrial sites
- After events: Retest after flooding, well repairs, nearby construction, or any change in taste/color/odor
Recommended Treatment for New Jersey Wells
Based on New Jersey's geology and common contaminant risks, these treatment systems address the most likely issues:
Removes arsenic, uranium, and most dissolved contaminants from drinking water
Learn moreKills bacteria and viruses without chemicals. Recommended for all well water systems
Frequently Asked Questions
Is well water in New Jersey safe to drink?
Well water quality in New Jersey varies significantly by location and geology. New Jersey sits on Coastal Plain and Piedmont sediments. Key concerns include PFAS from industrial/military sites. The only way to know your specific water quality is to test it. Use our free interpreter to understand your results.
How often should I test my well water in New Jersey?
The EPA recommends testing annually for bacteria (total coliform, E. coli), nitrate, total dissolved solids, and pH. Given New Jersey's arsenic risk, test for arsenic at least once and after any changes to your well. Radon testing is also recommended in New Jersey. Test more frequently if you notice changes in taste, color, or odor, or after flooding, nearby construction, or well repairs.
Does New Jersey require well water testing?
New Jersey has mandatory testing requirements. Private Well Testing Act requires testing for 28+ parameters at property transfer. However, the EPA strongly recommends annual testing regardless of state requirements. Your county health department may have additional local requirements.
What is the average water hardness in New Jersey?
Municipal water in New Jersey averages 45 PPM across 22 cities tracked by CheckMyTap, ranging from 25 to 70 PPM. Private well water typically runs 20-50% harder than city water because groundwater has more contact time with mineral formations. Many New Jersey well owners have manageable hardness levels, though local variation is significant. Check your city's data.