In Hopkins County, most wells that penetrate sandstones from depths of less than 300 feet are adequate for a domestic supply. In the areas surrounding Nortonville and south of Richland, most wells produce less than 100 gallons per day at depths of less than 300 feet. In southwestern Hopkins County, south of Charleston, a thin highly faulted zone running east-west yields unpredictable amounts of water to drilled wells. Generally, ground water is hard and sometimes iron or salt may be present in objectionable amounts. Often ground water becomes saltier with depth north of the highly faulted zone.

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