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Well Water Testing · Winterset, IA

Water testing in Winterset

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

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Winterset · Madison County

Well Water Testing in Winterset

Water testing for Iowa homes, above all those on a private well. An accredited laboratory can test the water for coliform bacteria and E. coli, nitrate, arsenic and more. Iowa DNR recommends testing a private well at least once a year.

Winterset is the covered-bridge county seat, a Victorian square town on southern-Iowa loess hills. Housing here runs to Victorian square-town homes and postwar additions, across the historic square district and the outer additions.

Winterset is served by our Des Moines team →  ·  (563) 517-7815

Well water in Madison County

For Madison County well owners, the Iowa DNR recommends yearly checks for coliform bacteria and nitrate and at least one arsenic test. The DNR also says free basic testing is available through the Grants to Counties Well Testing Program via the county health department. No Madison County well-quality data turned up in our research. Iowa Geological Survey material notes that bedrock aquifers become poorer in natural quality where they lie deeper, which is useful context for any drilled well.

County facts checked October 2026 against: iowadnr.gov, iowadnr.gov, igs.iihr.uiowa.edu, naturalresources.extension.iastate.edu.

Private wells and water systems around Winterset

Winterset, IA water testing: black manganese staining in a toilet tank in a newer Iowa home
E. coli: a sign of fecal contamination →
Clipboard and sample bottles on a Iowa kitchen counter (no readable text) in morning light (Madison County, Iowa)
VOCs: fuels, solvents and degreasers →

See all Winterset inspections →  ·  Water testing in Iowa, explained →

Water tests available in Winterset

Bacteria

Shows whether surface water or waste is reaching the well.

  • Total coliform bacteria
    Surface contamination reaching the well
  • E. coli
    Fecal contamination from septic, manure or wildlife

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 rock and soil
    10 µg/L (EPA)
  • Lead
    Lead service lines, solder and brass fixtures
  • Manganese
    Natural manganese; a concern for infants
  • 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

Household quality

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

  • Iron
    Rusty staining and metallic taste
  • 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 shown are EPA drinking water standards. Your lab report compares each result to the standards that apply.

Winterset private well testing timeline

Iowa DNR recommends testing a private well at least once a year. Its testing guidance lists coliform bacteria and nitrate every year and arsenic every 3 years, with at least one arsenic test for every well. Source: Iowa DNR
TestYear 1Year 2Year 3Year 4Year 5Year 6
Coliform bacteria
Nitrate
Arsenic

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.

How far a well must be from common hazards in Winterset

  • Property line4 ft
  • Building sewer line10 ft
  • LP gas tank15 ft
  • Roadside ditch15 ft
  • Stream, pond, lake or wetland25 ft
  • Septic tank50 ft
  • Septic absorption field100 ft
  • Fuel oil or gasoline tank100 ft
  • Fertilizer or chemical storage150 ft
Source: Iowa Administrative Code 567, chapter 49

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

Buying a home with a well in Winterset: what happens at the sale

  1. Groundwater Hazard StatementIowa Code 558.69 requires a groundwater hazard statement filed with the declaration of value when a listed condition (including any known well and its status under 455B.190, or a private sewage disposal system) exists on the property, signed by a seller or agent, with a copy given to the buyer.
  2. Wells on the propertyIf known wells are on the property, the statement must give the approximate location of each and its status under Iowa Code 455B.190 (abandoned wells properly plugged); the owner is responsible for the accuracy of the information.
  3. Septic time-of-transfer inspectionIowa Code 455B.172(11) requires a private sewage disposal system serving a building to be inspected before any transfer of ownership, by a DNR-certified inspector, and the county recorder will not record the deed without the report or a binding acknowledgment.
  4. Failing systemsA system that is failing to treat wastewater must be renovated to current standards by the seller or, by agreement and within a reasonable time set by the county board of health or DNR, by the buyer (455B.172(11)(c)).
Source: Iowa Code and Iowa DNR

The paperwork 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 in Iowa?
Any home on a private well, and above all one you are buying. Iowa DNR recommends testing a private well at least once a year, and also when a well is new, after work on the well or pump, and when the water changes in look, smell or taste.
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.
How often should a Madison County private well be tested?
Iowa DNR's private well program lists bacteria and nitrate as annual tests and arsenic every 3 years, while also urging at least one arsenic test for every well. It says to contact the local county health department about free testing. Beyond that general guidance, we found no Madison County figures showing how local wells have tested.
What should Winterset buyers expect?
A genuinely historic stock — the covered-bridge county seat's core is Victorian and early-1900s, which means stone foundations, original millwork, layered wiring and chimneys that have moved over a century. The loess-mantled clay hills add slope drainage and foundation movement, and Madison County sits in Iowa's Zone 1 radon country like the rest of the state.
Do I need a permit to drill or replace a private well?
Yes. Under 567 IAC 49.3(3) and Iowa Code 455B.187(2), a landowner cannot construct a new private well without first getting a well construction permit from DNR or a county with delegated authority. A permit is also required for replacement wells and for changes to a well's physical dimensions. The permit requires construction by a certified well contractor, and it is not transferable and expires one calendar year after issuance. A new or replaced well should be tested, and Iowa's rules call for a water sample 10 to 30 days after a new or reconstructed well goes into service.
Is nitrate in well water dangerous for infants?
Yes. The State Hygienic Laboratory says nitrate above 10 mg/L as N may pose a serious health hazard for infants, and such water should not be used in infant formula or juice. Infants fed it can develop methemoglobinemia, or blue baby syndrome, a life-threatening illness. Boiling does not remove nitrate. Shallow wells and poorly located, built or maintained wells are more likely to have nitrate, so annual testing is the way to know. A nitrate test is the only way to learn whether the water at a home with young children is below the 10 mg/L limit.
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