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Well Water Testing · St. Peter, MN

Well Water Testing in St. Peter

Well water testing for homes on a private well across Minnesota. We collect the sample the right way and send it to an accredited laboratory for…

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St. Peter · Nicollet County

Well Water Testing in St. Peter

Well water testing for homes on a private well across Minnesota. We collect the sample the right way and send it to an accredited laboratory for coliform bacteria and E. coli, nitrate, arsenic, lead, manganese, iron, hardness, pH, fluoride, sulfate and uranium. The Minnesota Department of Health recommends testing a private well for coliform bacteria every year, nitrate every other year, and arsenic and lead at least once. We also look at the visible wellhead, the pressure tank and the water treatment equipment during the home inspection.

St. Peter is a Minnesota River valley town of historic homes and university-area housing. Housing here runs to historic 1800s and early-1900s homes along Minnesota Avenue and near Gustavus Adolphus College, postwar neighborhoods, and the many roofs and homes rebuilt after the 1998 tornado, across the historic core along Minnesota Avenue, the college hill, and the postwar and post-1998 neighborhoods on the edges.

St. Peter is served by our Mankato team →  ·  (507) 721-3820

Well water in Nicollet County

MDA's 2018 township testing in Nicollet County's Ridgely Township found wells at or over the 10 mg/L nitrate limit. It was a small sample from one township, but it shows nitrate can matter here. MDH says arsenic occurs statewide and about 40 percent of new wells since 2008 had a detection. MDH also gives 100 µg/L as the manganese level for infant formula and says southwestern Minnesota tends high. We test for coliform bacteria and E. coli, nitrate, arsenic, lead, manganese, iron, hardness, pH, fluoride, sulfate and uranium through an accredited lab.

County facts checked September 2026 against: Minnesota Department of Health, Minnesota Department of Health, Minnesota Department of Health, mda.state.mn.us, nicolletcountymn.gov.

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Questions

Common questions.

Who needs well water testing?
Any home on a private well, and above all when you are buying one. A private well is not regulated like a city water system, so the owner is responsible for knowing what is in the water. Testing before closing tells you whether the water needs treatment while you can still ask questions or negotiate.
What do you test for?
Our lab panel covers coliform bacteria and E. coli, nitrate, arsenic, lead, manganese, iron, hardness, pH, fluoride, sulfate and uranium. Bacteria and nitrate are the short-term health checks. Arsenic, lead, manganese and uranium are the ones you cannot see or taste. Iron, hardness, pH and sulfate explain staining, scale, odor and wear on plumbing and appliances.
How often should a well be tested?
The Minnesota Department of Health recommends coliform bacteria every year, nitrate every other year, and arsenic and lead at least once. Test again after flooding, after any work on the well, or if the taste, color or smell of the water changes.
Is well water testing part of the home inspection?
It is an add-on. Book it with the home inspection and we collect the sample the same visit, so the lab results arrive with time to act on them inside your inspection window.
What did nitrate testing show in Nicollet County?
MDA sampled wells in Ridgely Township in 2018 and found some at or over the 10 mg/L nitrate limit. That is a small number of wells in one township, so it does not describe the whole county or your well. MDH lists nitrate testing every other year for private wells, and it matters most with an infant in the home.
Do you inspect St. Peter homes?
Yes, from our Mankato base. St. Peter's historic core gets the full older-home treatment — stone foundations, original wiring, chimneys, clay laterals — and a lot of the city's roofs, siding and windows date to the rebuild after the March 1998 tornado, so they are now 25-plus years old and get dated precisely. River-valley lots get the flood-history and sump read, and Nicollet County's Radon Zone 1 standing puts a 48-hour test on most visits.
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