USCanada

privatewelldata / Counties

Well water by county: New Jersey

Across 20 counties in New Jersey, 52 of 2225 sampled wells (2%) were above the arsenic limit and 158 of 3914 (4%) above the nitrate limit. Updated 2026-10-18. Source: Water Quality Portal (USGS, EPA, NWQMC), siteType=Well.

Share of sampled wells whose latest result is above the EPA limit (arsenic 10 µg/L, nitrate 10 mg/L as N).

Share of sampled wells above the limit, by county (% of wells). Source: USGS/EPA Water Quality Portal · privatewelldata.com
CountyArsenic > 10 µg/LNitrate > 10 mg/L
Atlantic County1% of 1714% of 301
Bergen County2% of 501% of 144
Burlington County1% of 1641% of 304
Camden County1% of 1562% of 286
Cape May County0% of 682% of 122
Cumberland County1% of 13419% of 175
Essex County0% of 200% of 36
Gloucester County6% of 3055% of 483
Hunterdon County10% of 1140% of 129
Mercer County4% of 929% of 147
Middlesex County1% of 1114% of 289
Monmouth County0% of 561% of 164
Morris County2% of 3200% of 381
Ocean County1% of 1542% of 453
Passaic County0% of 300% of 43
Salem County0% of 8720% of 181
Somerset County5% of 382% of 44
Sussex County2% of 811% of 130
Union County0% of 120% of 27
Warren County0% of 624% of 75