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Well Water Testing · Thor, IA

Water testing in Thor

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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Thor · Humboldt County

Well Water Testing in Thor

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.

Thor is a Scandinavian-settled 1881 railroad town in Humboldt County. Housing here runs to early-1900s homes from the Scandinavian settlement years, with postwar houses on the edges, across the compact 1882 plat.

Questions about a Thor home?  ·  Call or text (563) 517-7815

Well water in Humboldt County

Private wells in Humboldt County are the owner's responsibility to test. Iowa DNR recommends that all private well owners test at least annually, with coliform bacteria and nitrate checked each year, and arsenic tested at least once. DNR also notes that nitrate, arsenic, and other contaminants occur naturally in some aquifers, and that shallow groundwater is more exposed to surface contaminants. Annual nitrate testing is the DNR recommendation. Published county-level well results were not found for Humboldt County, so testing your own well is the only way to know what is in it.

County facts checked October 2026 against: iowadnr.gov, iowadnr.gov, services.shl.uiowa.edu.

Well water around Thor, Humboldt County

Thor, IA water testing: iron filter tank on the water line in a 1970s unfinished Iowa basement
DRO: a screen for diesel and heating-oil petroleum →
UV water disinfection unit on the water line in a newer Iowa basement (Humboldt County, Iowa)
Coliform bacteria: Iowa DNR recommends testing every year →

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

Water tests available in Thor

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.

Thor 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 Thor

  • 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 Thor: 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.
What nitrate level is considered a problem in a Humboldt County well?
Iowa State Hygienic Laboratory materials use 10 mg/L nitrate as nitrogen as the benchmark; wells above it that are bacterially safe may qualify for further testing for other contaminants such as pesticides. DNR recommends testing nitrate annually, along with bacteria, and warns that water above EPA limits should not be consumed without proper treatment.
Do you cover Thor?
Yes — Thor is inside our Fort Dodge coverage, served from Buffalo Center. It is an 1881 railroad town, so the inspection is built around age: wiring and plumbing updated in stages, chimneys, roof layers, and stone or early-block foundations on slow-draining till. A sewer scope is recommended on the original streets, and Humboldt County's Radon Zone 1 standing puts a 48-hour test on most visits.
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.
What is the Iowa Groundwater Hazard Statement?
Under Iowa Code 558.69, a groundwater hazard statement must be submitted with the declaration of value when property is conveyed, if any listed condition exists. It covers known private burial sites, wells and their status under section 455B.190, hazardous solid waste disposal sites, underground storage tanks, hazardous waste, and private sewage disposal systems. A seller or agent signs it, and the buyer must be given a copy. A well disclosed on the statement is a reason to have the water tested and the wellhead looked at before closing.
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