Long Island’s aquifers
Long Island depends on four massive aquifers. They are:
• The Upper Glacial Aquifer. Found near the surface, this aquifer is roughly 700 feet deep at its deepest point.
• The Jameco Aquifer. A lower glacial deposit that runs along the northern and southern coasts of Nassau County, it’s found 150 to 550 feet below the surface and is as deep as 200 feet.
• The Magothy Aquifer. Underlying Nassau and Suffolk counties, it’s 600 feet below the surface and reaches a depth of 1,100 feet.
• The Lloyd Aquifer. Sitting atop bedrock, this aquifer is found 200 to 1,800 feet below the surface and is 560 feet deep at its deepest point.
Source: U.S. Environmental Protection Agency