Lindenhurst Water Hardness & Quality Report (2026)

Lindenhurst, New York, in Suffolk County — a major south Long Island suburban community (Lindenhurst is a significant Suffolk County village — a south shore Long Island community on the Great South Bay adjacent to Babylon and Amityville; Lindenhurst is one of the quintessential south shore Long Island working-class and middle-class suburban communities; Lindenhurst developed rapidly after WWII as part of the broader Long Island suburban expansion, particularly attracting New York City families of Italian-American, German-American, and Irish-American heritage), home of significant south shore recreational boating culture (Lindenhurst's position on the Great South Bay makes it a major boating and fishing community — the bay access is central to Lindenhurst's residential appeal), a diverse Suffolk County community with a primarily Italian-American, working-class, and increasingly Hispanic-American suburban family population, adjacent to North Lindenhurst and Amityville in the south Suffolk County corridor — draws its municipal water supply via the Suffolk County Water Authority. Water hardness in Lindenhurst measures 92.5 mg/L — classified as moderately soft.

Lindenhurst's moderate softness reflects the south Suffolk County Long Island glacial outwash aquifer's calcareous-poor character. The Magothy Aquifer at Lindenhurst draws from Cretaceous calcareous-poor Magothy Sand with effective treatment, producing the moderately soft 92.5 mg/L.

With hardness at 92.5 mg/L, Lindenhurst residents enjoy moderately soft water. Suffolk County Water Authority consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.