Best Water Quality Counties in New Jersey
EPA drinking water health violations and safety grades Compare rankings across all 21 counties.
All New Jersey Counties Ranked
| # | County | Water Quality Score | Overall Score |
|---|---|---|---|
| 1 | Union County, NJ | 86 | 35.3 |
| 2 | Hudson County, NJ | 71.1 | 33.6 |
| 3 | Gloucester County, NJ | 67.8 | 41.7 |
| 4 | Cape May County, NJ | 67.5 | 38.9 |
| 5 | Bergen County, NJ | 67.1 | 48 |
| 6 | Warren County, NJ | 64.1 | 48.8 |
| 7 | Ocean County, NJ | 63 | 47.4 |
| 8 | Mercer County, NJ | 62.3 | 35 |
| 9 | Middlesex County, NJ | 61.7 | 41.9 |
| 10 | Burlington County, NJ | 60.6 | 46.6 |
| 11 | Atlantic County, NJ | 59.9 | 31.9 |
| 12 | Somerset County, NJ | 59.3 | 51.4 |
| 13 | Camden County, NJ | 57.5 | 32.1 |
| 14 | Monmouth County, NJ | 57.5 | 46 |
| 15 | Essex County, NJ | 55.8 | 33.3 |
| 16 | Passaic County, NJ | 52.8 | 28.9 |
| 17 | Morris County, NJ | 45.1 | 52 |
| 18 | Hunterdon County, NJ | 30.5 | 55.3 |
| 19 | Cumberland County, NJ | 30.4 | 25.4 |
| 20 | Sussex County, NJ | 28.3 | 53.5 |
| 21 | Salem County, NJ | 22.4 | 42.1 |
Data Source
Water Quality data from WaterByCounty. See full details at WaterByCounty. Data updated February 2026.