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Well Water Testing · Bayport, MN

Water testing in Bayport

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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Bayport · Washington County

Well Water Testing in Bayport

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.

Bayport is a small St. Croix River city of historic homes. Housing here runs to historic St. Croix riverfront homes with some newer infill, across the riverside historic blocks.

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

Well water in Washington County

MDA's 2014-2015 township testing in Washington County covered Cottage Grove and Denmark. The final dataset held 441 wells with 15.0% at or over the 10 mg/L nitrate-nitrogen health risk limit. Cottage Grove (city) was 20.2% and Denmark 8.3%. MDA said Cottage Grove had more than 10% of wells over the limit. MDH lists coliform yearly, nitrate every other year, and arsenic and lead at least once.

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

Water testing in Bayport: what matters

Bayport, MN water testing: well cap in the foreground, ranch home on acreage behind it in central Minnesota lake country in spring green
Nitrate: EPA limit 10 mg/L, highest risk to infants →
Well cap in the foreground, 1970s rambler behind it in central Minnesota lake country in winter snow (Washington County, Minnesota)
Coliform bacteria: MDH recommends testing every year →

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

Water tests available in Bayport

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.

Bayport 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 Washington County wells

15%

15% of 441 wells tested in Cottage Grove and Denmark were at or over the 10 mg/L nitrate standard (MDA township testing, 2014-2015).

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

What a properly finished wellhead looks like in Bayport

12 in. minimumabove groundground slopes awayvent screened, down
  • Casing at least 12 inches above the ground, slab or well house floor.
  • Vent ends at least 12 inches above ground, screened, opening facing down.
  • Ground graded so water drains away. A casing ending below ground, as in a well pit, is not allowed.
Source: Minnesota Rules 4725.2250 and 4725.5450

A short casing or a buried well pit lets surface water in. A coliform bacteria test shows whether it is reaching the water. Get a free instant quote

Buying a home with a well in Bayport: 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

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.
Is nitrate high in Washington County wells?
In MDA's 2014-2015 testing, 15.0% of 441 wells were at or over 10 mg/L. Cottage Grove was 20.2% and Denmark 8.3%, so it depends on location.Coliform bacteria and E. coli are the pass-fail items lenders and buyers ask about first.
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.
What is specific to Bayport's older riverfront homes?
Age and water. Century-old riverfront stock brings original systems, stone-and-brick foundations and the drainage consequences of sitting below the bluff line — bluff runoff concentrates at the base, so grading and foundation moisture get read carefully.
How do I get nitrate out of my well water?
MDH recommends first having a licensed well contractor inspect the well and removing nitrate sources on your property. Home treatment can follow. MDH's guidance lists anion exchange, reverse osmosis, and distillation among options, and advises certified units. Babies under six months should still not drink treated water, and retest after treatment.
Should I test for E. coli when buying a house with a well?
A bacteria test is a standard way to check a private well, and CDC advises well owners to test for coliform bacteria and E. coli. Results reflect the day of sampling, and an accredited laboratory analyzes the sample. A positive result can be addressed through disinfection, retesting, and inspection of the well.
Who is allowed to seal a well in Minnesota?
Only licensed or registered contractors. Minnesota Rules 4725.3875 makes the property owner responsible for having a contractor licensed or registered under the rules seal an unused well or boring. The Department of Health also states that only a licensed well contractor can legally seal wells. Its online directory lists currently licensed contractors. Sealing is licensed work done by a well contractor; testing the well in use is a separate step.
How can I tell if there is a forgotten well on my property?
The Department of Health suggests looking for a pipe 1 to 8 inches wide at, above, or below the surface, a low spot or sunken area, a metal, wood, or concrete cover, a windmill or old well house, and a concrete patch or glass block in a basement step or floor. Well pits and basement offsets are other common signs. Visible signs like these are worth raising with your agent and a licensed well contractor.
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