Bethpage Water Hardness & Quality Report (2026)

Bethpage, New York, in Nassau County — a Nassau County hamlet adjacent to Plainview and Levittown in central Long Island — receives its municipal water from New York American Water (or the Bethpage Water District), drawing from the Long Island Aquifer (central Nassau County shallow zone) through local well production.

The moderately soft 90 mg/L hardness and TDS of 159.4 mg/L reflect the central Long Island Aquifer character — moderately softer than the eastern Nassau readings (Levittown: ~155 mg/L; Merrick: ~165 mg/L) and much softer than the Suffolk County aquifer zone (East Setauket: 177 mg/L; Sayville: 164.5 mg/L). The Long Island Aquifer at central Nassau is developed in Quaternary Ronkonkoma Moraine glacial outwash (quartz-dominant — relatively low carbonate content) and Cretaceous Magothy Formation beneath. The relatively low-carbonate glacial outwash produces the moderately soft central Long Island supply.

At 90 mg/L, Bethpage'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 4.4 ppt warrants a certified drinking water filter — Grumman-Northrop Bethpage facility (the historic Bethpage Superfund Site — one of the most significant industrial PFAS contamination sites in New York, with a large solvent and PFAS plume beneath central Nassau County) is the primary local contributor to Bethpage's groundwater readings.