Lynbrook Water Hardness & Quality Report (2026)

New York American Water – Lynbrook Operations District serves Lynbrook in Nassau County, Long Island, providing water to approximately 227,658 people through 75,886 connections. The utility draws from groundwater wells tapping the Long Island aquifer system beneath the surface. Water is treated prior to distribution through six processes, though specific plant names are not detailed in reports. This district is part of broader Long Island operations managed by American Water and later Liberty Utilities, which publishes annual Consumer Confidence Reports confirming regulatory compliance.

The supply originates from the Long Island groundwater watershed, encompassing the Upper Glacial, Magothy, and Lloyd aquifers — unconsolidated Pleistocene and Cretaceous sedimentary formations of sands, gravels, and clays. The glacial deposits overlay older coastal plain sediments of the Raritan Formation, imparting a moderately mineralised character through dissolution of carbonate minerals in the glacial till and aquifer matrix. This yields balanced dissolved solids, with the soft supply contrasting with harder waters from shallower limestone-influenced zones.

At 17 mg/L, Lynbrook's water is soft, so scale buildup is minimal in water heaters, dishwashers, and coffee makers. Light spotting on laundry machines and faucets can occur; periodic vinegar descaling and detergent boosters are adequate maintenance. A softener is rarely needed but may benefit households sensitive to soap scum. Water meets all EPA MCLGs — pH averages 7.65, lead 90th percentile is 3.0 µg/L (action level 15 µg/L), copper ND–0.03 mg/L, fluoride 0 mg/L naturally, and no notable PFAS exceedances are reported.