Series investigates Twin Cities groundwater

In a three-part series that began Sunday, Sept. 16, David Shaffer of the Star Tribune analyzed databases and pollution reports to identify 20 areas of significant groundwater contamination in the Minneapolis-St. Paul metropolitan region. Most of them are located in the suburbs, and some pose a serious threat to drinking water supplies. The series looks at the costly and seemingly endless effort it takes to filter the underground pollution and its toll on people and communities.