Jericho Water Hardness & Quality Report (2026)

The Jericho Water District (JWD) provides drinking water to communities including Syosset and parts of Oyster Bay in Nassau County, New York. Their entire supply comes from groundwater wells tapping into the Upper Glacial and Magothy aquifers beneath Long Island. There are no surface water sources like reservoirs or rivers involved in their system. Water treatment occurs at district facilities, which include wells and plants focused on disinfection and ongoing monitoring to ensure quality for residents. JWD can be reached at 516-921-8280 for specific service inquiries.

The groundwater serving Jericho originates from the local watershed of central Long Island, specifically from the recharge areas feeding the Upper Glacial and Magothy aquifers. These formations consist of glacial sands and gravels deposited over sandy clays, showing the influence of Pleistocene ice age deposits and older coastal plain sediments. The geology naturally imparts a moderately mineralized character to the water as it flows subsurface and leaches minerals from the aquifer materials, without the dilution effects of surface runoff. This results in a balanced mineral profile shaped by its journey through Long Island's underground sediment layers.

With moderately hard water, you might notice gradual scale buildup in appliances like water heaters, dishwashers, and coffee makers. This accumulation can reduce efficiency and increase energy consumption over time. Laundry machines may also be affected, and you might see spotting or film on dishes and glassware after washing. Regular maintenance, such as descaling with vinegar and flushing heaters, can help. For those concerned about consistent mineral content, a water softener is often recommended to extend appliance lifespan and improve how effectively soaps and detergents lather. Recent JWD reports confirm compliance with drinking water standards, including lead and copper levels.