Well water testing labs in Minnesota

Last verified October 26, 2026 against the official state list (October 2026).

Minnesota publishes an official list of accredited labs that accept drinking water samples from private well owners. We copied it below, sorted by county, so you can find a lab near you and see which of the five common tests each lab runs.

1.2 million Minnesotans get their drinking water from a private well, according to the Minnesota Department of Health.

Labs by county

Anoka Becker Beltrami Brown Crow Wing Douglas Fillmore Goodhue Hennepin Koochiching Lyon Nobles Olmsted Sherburne St. Louis Stearns Waseca

Anoka County

Becker County

Beltrami County

Brown County

Crow Wing County

Douglas County

Fillmore County

Goodhue County

Hennepin County

Koochiching County

Lyon County

Nobles County

Olmsted County

Sherburne County

St. Louis County

Stearns County

Waseca County

“(subcontracted)” means: Sample is subcontracted to a lab accredited for that test. Manganese is left off where the state list shows no mark.

Notes on this list

• The state list says these labs held valid accreditation when the list was made, and that other accredited labs may not appear on it.
• County is shown as printed on the state list.
• For any other contaminant, the state's lab search lets you filter for labs that accept samples from private homeowners.

What the state recommends

• MDH says you are responsible for regularly testing your well water, and recommends using an accredited laboratory. Contact a lab for sample containers and instructions, or ask your county environmental or public health services whether they offer well testing. Source
• For a new well, MDH says the licensed well contractor collects an initial sample to test for coliform bacteria, nitrate, and arsenic before you use the water for drinking or cooking. Source

State contacts

• MDH Well Management Section: 651-201-4600 or 800-383-9808, [email protected] Source
• MDH Water Policy Center (publisher of the lab list): 651-201-5594, [email protected] Source
• MNELAP (questions about a lab's accreditation): 651-201-5324, [email protected] Source

Sources

• Accredited Labs in Minnesota Accepting Drinking Water Samples from Private Well Users (PDF, October 2026)
• MDH: Search for Accredited Laboratories
• MDH: Owner's Guide to Wells

Other states

Well water testing labs in Texas · Well water testing labs in Vermont

Also read: well water danger guides on PFAS, nitrates, arsenic, lead, and bacteria.