Arsenic is a metal naturally found in bedrock and can leach into water from soil and mineral deposits. The EPA has classified Arsenic as a human cancer-causing agent. Since you cannot smell it or taste it, well water must be tested with a specific water test to determine if it is contaminated. The Department of Health recommends testing at least once and ideally repeating the test every five years. The EPA has set the standard for Maximum Contamination Level is 0.01mg/l for long-term consumption.
Arsenic is removed from well water with a reverse osmosis water treatment system, a distiller, or a filter bed of active alumina. Because it is not necessary to treat all the water in the house, installing a point-of-use treatment system at a kitchen sink or water tap on the refrigerator may meet treatment needs.