Field Test (IMAGE) Columbia Climate School Caption Millions may be exposed to private well water that tests above federal safety limits for arsenic. Here, a field test in central Maine shows one homeowner's well has a high level. Credit Robert Marvinney, Maine Geological Survey Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.