Williamstown Water Hardness & Quality Report (2026)

Williamstown, New Jersey, in Gloucester County — an unincorporated Gloucester County community adjacent to Monroe and Clayton in the south New Jersey Pinelands — receives its municipal water from New Jersey American Water, drawing from local Atlantic Coastal Plain wells (Gloucester County) through the south New Jersey distribution system.

The moderately soft 51.5 mg/L hardness and very low TDS of 84.1 mg/L reflect the south New Jersey Coastal Plain sandy aquifer's nearly insoluble character — consistent with other southern New Jersey Pinelands communities. The Atlantic Coastal Plain aquifer at Gloucester County is developed in Cretaceous Kirkwood Formation (slightly calcareous quartz sand — minimal hardness contributor), Pleistocene Kirkwood-Cohansey aquifer (insoluble quartz sand — the Pinelands' dominant water-bearing formation), and minor Eocene Vincentown calcareous sand (trace hardness). The predominantly insoluble quartz sand produces the moderately soft south Jersey supply.

At 51.5 mg/L, Williamstown's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 5.8 ppt warrants a certified drinking water filter — Joint Base McGuire-Dix-Lakehurst (Burlington-Ocean counties — AFFF, the dominant south New Jersey PFAS source with plumes migrating into the Gloucester County Coastal Plain aquifer) and the New Jersey Pinelands Superfund PFAS legacy contribute to Williamstown's readings.