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Facts about the Mahomet aquifer

July 22, 2014

CHAMPAIGN, Ill. (AP) — The Mahomet Aquifer is a formation of sand and gravel that runs roughly from the Indiana state line west to the Illinois River in Cass County in west-central Illinois. It underlies parts of 14 counties, appearing on a map like a giant zigzag jutting southwest from near Danville to the Illinois River south of Peoria.

—The counties involving the aquifer are Cass, Champaign, DeWitt, Ford, Iroquois, Macon, Mason, McLean, Menard, Piatt Vermilion and Woodford.

—The sand and gravel, which are more than 100 feet below ground in the eastern end of the formation and become shallower to the west, are saturated with water.

—Water utilities across much of the part of central Illinois that sits over the aquifer tap it for drinking water. In all, about 750,000 people use the aquifer for at least some of their drinking water. Farms and businesses in towns across the region use it, too.

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