HARTFORD, Conn. (AP) - Connecticut health officials are urging homeowners who rely on well water to have their systems checked for arsenic and uranium contamination. The advice comes as the result of a study by the U.S. Geological Survey released Tuesday that found almost 4% of private wells have elevated levels of arsenic and nearly 5% have higher concentrations of uranium than acceptable under federal guidelines. Arsenic exposure has been lined to an increased cancer risk, low birth weight, decreased child intellectual development, immune system suppression and other health issues. Ingestion of uranium has been associated with kidney disease.