Abandoned and unsealed wells are a potential source of groundwater contamination. Surface water runoff, contaminated water, and improperly disposed of waste may enter unused, unsealed wells and make its way into the groundwater and subsequently into your drinking water.
Landowners with unused, unsealed wells on their property should hire a state-licensed contractor to assess and properly seal their wells. The Minnesota Department of Health has a list of licensed well contractors. You can call them at (651) 201-4600 or visit their website.