Because private well water is not monitored by testing at a treatment facility, the EPA recommends testing twice a year.
In the past, we’ve had to refer folks to private companies to have their water tested, but we recently found a supplier of reasonably-priced well-water testing kits! The kits test for 10 contaminants, and cost $30.
Although the local health department regulates the drilling of new wells and the sealing of old ones, it is the responsibility of the homeowner to maintain the safety of their water. The EPA does not regulate private drinking water wells.