New Jersey Water Quality
Drinking water data for all 21 counties.
Avg Water Score
55.7
State Grade
D
Counties with Data
21
of 21 total
All New Jersey Counties
| County | Water Score |
|---|---|
| Union County | 86.0 |
| Hudson County | 71.1 |
| Gloucester County | 67.8 |
| Cape May County | 67.5 |
| Bergen County | 67.1 |
| Warren County | 64.1 |
| Ocean County | 63.0 |
| Mercer County | 62.3 |
| Middlesex County | 61.7 |
| Burlington County | 60.6 |
| Atlantic County | 59.9 |
| Somerset County | 59.3 |
| Camden County | 57.5 |
| Monmouth County | 57.5 |
| Essex County | 55.8 |
| Passaic County | 52.8 |
| Morris County | 45.1 |
| Hunterdon County | 30.5 |
| Cumberland County | 30.4 |
| Sussex County | 28.3 |
| Salem County | 22.4 |
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Frequently Asked Questions
Which county in New Jersey has the best water quality?
Union County has the highest water quality score in New Jersey at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in New Jersey has the most water violations?
Salem County has among the lowest water quality scores in New Jersey at 22.4/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in New Jersey?
New Jersey has an average water quality score of 55.7/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in New Jersey water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.