Coram Water Hardness & Quality Report (2026)

Coram, New York, an unincorporated hamlet in the Town of Brookhaven in Suffolk County — a major central Long Island community in the Brookhaven Town suburban corridor, one of the largest unincorporated communities in Suffolk County by population, adjacent to Medford, Selden, and Middle Island in the Long Island central suburban belt, and a diverse Long Island community in the middle of the Island (about halfway between the New York City border and the East End) — draws its municipal water supply from the Magothy and Upper Glacial Aquifers via the Suffolk County Water Authority (SCWA). Water hardness in Coram measures 71.5 mg/L — classified as moderately soft.

Coram's moderate softness reflects the central Long Island Magothy Aquifer's calcareous-poor geology. The Magothy Aquifer and Upper Glacial Aquifer at Coram–central Suffolk County draw from: the Cretaceous Magothy Formation (calcareous-poor quartz-dominated sand — the primary Long Island aquifer, deposited as coastal plain sediment with minimal carbonate cement); and Pleistocene Ronkonkoma and Harbor Hill Moraine deposits (calcareous-poor glacial outwash sand and gravel). The SCWA treatment of the calcareous-poor Long Island sand aquifer produces the moderate 71.5 mg/L.

With hardness at 71.5 mg/L, Coram residents enjoy moderately soft water. SCWA consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.