Groundwater resources in McCracken County are abundant, with fair to good water quality. All areas of the county can produce enough water for a domestic supply from drilled wells at reasonable depths. Multiple zones of production are common throughout the county. The depth of uppermost production is between 30 and 200 feet. Generally, depth to adequate groundwater is less than 100 feet, except in the uplands of southwestern McCracken County, where adequate groundwater is obtained at depths greater than 100 feet. Water quality generally is good, except in areas where downward percolation of surface water and fluids from domestic sewage-disposal systems, and other sources of domestic or industrial pollution, have contaminated the aquifer. Groundwater sometimes contains naturally occurring iron in objectionable amounts from the deeper zones. In some formations with slightly acidic groundwater, a chemical reaction between the acidic groundwater and steel well casing and pump
equipment will produce a high iron content in the water.

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