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Well Water Testing · Mountain Lake, MN

Water testing in Mountain Lake

Water testing for Minnesota homes, above all those on a private well. An accredited laboratory tests the water for coliform bacteria and E. coli…

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Mountain Lake · Cottonwood County

Well Water Testing in Mountain Lake

Water testing for Minnesota homes, above all those on a private well. An accredited laboratory tests the water for coliform bacteria and E. coli, nitrate, arsenic, lead, manganese, VOCs (volatile organic compounds), DRO (diesel range organics), 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.

Mountain Lake is a Mennonite-heritage prairie town of older homes around a drained lakebed. Housing here runs to older Mennonite-heritage homes, across the town core around the old lakebed.

Questions about a Mountain Lake home?  ·  Call or text (612) 457-1634

Well cap in the foreground, modern farmhouse with black windows behind it on the southwestern Minnesota prairie in winter snow: well water testing in Mountain Lake, MN
Nitrate: EPA limit 10 mg/L, highest risk to infants →

Well water in Cottonwood County

MDA's 2018 township testing in Cottonwood County covered Amboy, Dale, Germantown and Southbrook townships. Only 34 wells were tested there and 8.8% were over the 10 mg/L nitrate-nitrogen health standard; MDA noted that many homes in the area are on a rural water supply rather than a private well. So confirm which source a property uses. For a private well, MDH lists coliform yearly, nitrate every other year, and arsenic and lead at least once.

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

Well cap in the foreground, newer two-story home on a rural lot behind it on the southwestern Minnesota prairie in autumn color: well water testing in Mountain Lake, MN
Coliform bacteria: MDH recommends testing every year →

See all Mountain Lake inspections →  ·  More about well water testing →  ·  Every water test, explained →

Water tests available in Mountain Lake

Bacteria

Shows whether surface water or waste is reaching the well.

  • Total coliform bacteria
    Surface contamination reaching the well
    None should be present (MDH)
  • E. coli
    Fecal contamination from septic, manure or wildlife
    None should be present (MDH)

Health chemicals

No taste, color or smell. These are the long-term health checks.

  • Nitrate
    Fertilizer, septic and manure; highest risk to infants
    10 mg/L (EPA)
  • Arsenic
    Natural arsenic from Minnesota rock and soil
    10 µg/L (EPA)
  • Lead
    Lead service lines, solder and brass fixtures
    No safe level (MDH)
  • Manganese
    Natural manganese; a concern for infants
    100 µg/L for infants (MDH guidance)
  • Fluoride
    Natural fluoride; dental health
    4.0 mg/L (EPA)
  • Uranium
    Natural radionuclide in groundwater
    30 µg/L (EPA)

Petroleum & solvents

Fuel and chemical spills from old tanks or nearby sites.

  • VOCs (volatile organic compounds)
    Fuels, solvents, degreasers and paints
    Varies by compound (EPA)
  • DRO (diesel range organics)
    Diesel and heating-oil petroleum
    No limit of its own; a petroleum screen (MPCA)

Household quality

Staining, scale and taste, and choosing the right treatment.

  • Iron
    Rusty staining and metallic taste
    0.3 mg/L, aesthetic (MDH)
  • Hardness
    Scale buildup; sizing a water softener
    No health standard
  • pH
    Corrosive or scaling water
    6.5 to 8.5, aesthetic (EPA)
  • Sulfate
    Taste and odor; diarrhea risk for infants
    250 mg/L, aesthetic (EPA)

Limits from MDH, EPA and MPCA. Your lab report compares each result to these values.

Mountain Lake private well testing timeline

Minnesota Department of Health schedule: coliform bacteria every year, nitrate every other year, arsenic and lead at least once. Source: MDH
TestYear 1Year 2Year 3Year 4Year 5Year 6
Coliform bacteria
Nitrate
Arsenic
Lead

Test again any time after flooding, after work on the well, or when the water's taste, color or smell changes, and always when you buy a home with a well.

Nitrate in Cottonwood County wells

8.8%

8.8% of 34 wells tested in Amboy, Dale, Germantown and Southbrook townships were at or over the 10 mg/L nitrate standard (MDA township testing, 2018).

Source: Minnesota Department of Agriculture township testing

Township numbers are averages. Only a test of your own well tells you its nitrate level. Get a free instant quote

Buying a home with a well in Mountain Lake: the disclosure rules

  1. Before the purchase agreementThe seller discloses in writing every known well and whether it is in use, not in use or sealed.
  2. At closingA well disclosure certificate is signed, unless the deed says the seller knows of no wells.
  3. If a well was hiddenA seller who knew of an undisclosed well can owe the sealing cost and attorney fees if the buyer sues within six years.
Source: Minnesota Statutes 103I.235

The disclosure tells you a well exists, not what is in it. Add water testing to your inspection. Get a free instant quote

How far a well must be from common hazards in Mountain Lake

  • Building (closest projection)3 ft
  • Lake, river, stream or pond35 ft
  • Septic tank50 ft
  • Drainfield (soil dispersal area)50 ft (100 ft sensitive well)
  • Animal feedlot or building (over 1 animal unit)50 ft
  • Cesspool or seepage pit75 ft (150 ft sensitive well)
  • Unroofed feedlot, 300+ animal units100 ft
  • Unprotected petroleum tank, 1,100+ gallons150 ft
Source: Minnesota Rules 4725.4450 and 4725.4350

Septic, feedlot or fuel tank near the well? A coliform and nitrate test shows whether it is reaching the water. Get a free instant quote

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 does the water panel cover?
The panel covers coliform bacteria and E. coli, nitrate, arsenic, lead, manganese, VOCs (volatile organic compounds), DRO (diesel range organics), 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. VOCs and DRO screen for solvents and petroleum, such as fuel from an old oil tank or a nearby leak site. 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. Add it to your home inspection quote. Testing early in your inspection window leaves time to act on the results.
Should I test nitrate if the house is on rural water?
If the property is served by a rural water system, the private-well concerns differ, so confirm the source first. MDA noted many homes in the surveyed Cottonwood townships use rural water. If there is a private well, its 2018 sample found 8.8% of 34 wells over 10 mg/L, so testing nitrate makes sense.
My home is on city water. Is water testing still worth it?
Often yes. Community water systems follow EPA testing rules and report results in an annual Consumer Confidence Report, but that report does not measure your own plumbing. MDH and EPA say lead enters mainly from service lines and plumbing materials, and the only way to know is a tap test. MDH recommends an accredited lab, and your utility can say whether your home has a lead service line.
When should a home be tested for DRO or VOCs?
MDH suggests considering a VOC test when a well is near fuel tanks or a commercial or industrial area. MPCA reports petroleum has leaked at about 22,000 Minnesota sites, including home heating-oil tanks, and releases can threaten drinking water and send vapors into buildings. Reasons to test include a nearby leak site, a former or buried fuel tank, or a fuel odor or sheen. MPCA's leaking-tank-site database shows reported releases.
Does the drained lakebed matter in Mountain Lake?
It can — former lakebed soils hold water and settle differently than upland till, so foundation movement and basement moisture get a careful read here.
How do you get rid of VOCs in well water?
MDH advises first removing the source of contamination or using a safer water supply. If that is not possible, home treatment may be appropriate, and some technologies can reduce VOCs depending on the filter media. Choose a certified unit, use a licensed plumber or water conditioning contractor, and retest after installation.
How often should I test my well for arsenic?
MDH recommends testing every private well for arsenic at least once. If arsenic is not detected in the first sample, it is unlikely to appear later. If it is detected in a new well, MDH recommends retesting about six months after construction. Use an accredited laboratory.
What is a sand-point well and is it riskier?
A drive-point (sand-point) well is a pointed screen on tightly coupled steel pipe, usually 1.25 inches in diameter, driven below the water table. The Department of Health notes that dug, bored, and drive-point wells are often under 50 feet deep and are more likely to be contaminated by surface water, septic sewage, or chemical spills. Shallower wells are a reason for regular coliform and nitrate testing.
What should I look for on a well cap?
The Department of Health asks owners to check whether the well cap is securely attached, broken, or missing, whether the casing has cracks, holes, or corrosion, and whether electrical conduit and other connections are watertight. Under Minnesota Rules 4725.5450, a vent must be screened with openings of 1/16 inch or less and point downward. A damaged cap or vent is a good reason to test for coliform bacteria.
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