Properly constructed and maintained water wells can provide many years of trouble-free service, but like any other mechanical devices, wells will eventually deteriorate or become damaged, and allow surface contaminants to enter the water. In addition, some groundwater can contain one or more chemical substances in concentrations above state health limits.
Public Water System Tests
Public water systems are tested regularly for a variety of contaminants, but if you have a private well, regular testing is up to you. Here are some recommendations from the Minnesota Department of Health (MDH) that you can follow to assure that your well water is safe.