Private well water testing in Minnesota, by county

MDH says about 1.1 million Minnesotans (20 percent of the population) rely on private well water, and that well owners are responsible for regularly testing it. MDH recommends testing every year for coliform bacteria and nitrate, and at least once for arsenic, lead and manganese, using an MDH-accredited lab.^[1][2]

County guides

• Washington County Last verified 2026-11-03
  Washington County's private wells sit over the 3M/East Metro PFAS plume, where MDH has issued 3,165 well advisories since 2003 and eligible wells get free PFAS testing and filters;...

Statewide resources

• MDH - Accredited labs accepting private well samples (map and table, PDF)
• MDH - Search for accredited laboratories
• MDH - Well Testing, Results, and Options
• MDH - Special Well and Boring Construction Areas