Plainview Water Hardness & Quality Report (2026)

The Plainview Water District serves the Plainview community in Nassau County, New York, providing drinking water to residential and commercial customers. Water is sourced from 12 wells drilled to depths of approximately 372–688 feet into the Upper Glacial and Magothy aquifers across multiple well sites throughout the district. There are no surface water sources; the supply relies on groundwater extraction with basic treatment for disinfection and contaminant control. Recharge occurs where precipitation infiltrates the sands and gravels of the Long Island glacial aquifer system.

Key geological features include Pleistocene glacial deposits overlying the Cretaceous Magothy and Raritan Formations, which feature unconsolidated sands, clays, and minor calcareous lenses. Limestone and dolomite bedrock are absent, but the aquifers contact calcareous glacial deposits and dissolve calcium and magnesium from shell fragments and mineral-rich sediments as groundwater percolates through. This geology results in a hard supply, without the softness typical of pure sand aquifers.

At hard water levels, scale buildup accelerates in water heaters, dishwashers, washing machines, and faucets, reducing efficiency and lifespan; heating elements and fixtures show visible white mineral deposits. Regular vinegar descaling, low-flow aerators, and magnetic descalers help mitigate effects; a water softener is recommended to prevent clogged pipes and extend equipment life. The 2024 report confirms no EPA violations across 126+ contaminants tested; elevated nitrates are detected below 10 ppm MCL, likely from fertilizers and septic leaching, and 1,4-Dioxane is present at non-significant risk levels.