Dix Hills Water Hardness & Quality Report (2026)

Dix Hills, New York, in Suffolk County — a major central Long Island affluent suburban community (Dix Hills is a significant Suffolk County hamlet — a central Long Island community in Huntington Town adjacent to Melville and Deer Park; Dix Hills is one of the most affluent hamlets in Suffolk County — a large-lot, heavily wooded residential community that has attracted upper-middle-class and upper-class Long Island families; Dix Hills is known for its estate-style homes and its proximity to major employment centers along Route 231 and the Long Island Expressway corridor; Dix Hills is the home of several significant residential estates and is part of the broader Half Hollow Hills community (the Half Hollow Hills Central School District — one of the most respected public school districts in Long Island — serves Dix Hills and portions of Melville and Wheatley Heights)), a diverse Suffolk County community with a primarily Jewish-American, Italian-American, and upper-middle-class suburban family population, adjacent to Melville in the central Suffolk County Huntington Town corridor — draws its municipal water supply via the Suffolk County Water Authority. Water hardness in Dix Hills measures 134.5 mg/L — classified as moderately hard.

Dix Hills's moderate hardness reflects the central Suffolk County Long Island Magothy aquifer's calcareous-moderate character. The Magothy Aquifer at Dix Hills draws from Cretaceous calcareous-moderate Magothy Sand with limited softening, producing the moderately hard 134.5 mg/L.

At 134.5 mg/L, Dix Hills residents encounter moderate scale accumulation. Monthly cleaning is recommended. Suffolk County Water Authority consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.