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Well Water Testing · Leighton, IA

Water testing in Leighton

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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Leighton · Mahaska County

Well Water Testing in Leighton

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.

Leighton is a small railroad-platted farm town of older homes in northern Mahaska County. Housing here runs to late-1800s and early-1900s frame farm-town homes on stone and early block foundations, with a thin layer of postwar houses, across the small platted grid along the old Keokuk & Des Moines line and the farmsteads on the section roads around it.

Leighton homes are inspected by a local partner in our Iowa network.  ·  Call or text (563) 517-7815

Well water in Mahaska County

No Mahaska County private well data were found. Iowa DNR recommends testing private wells for coliform bacteria and nitrate yearly, plus arsenic at least once, and refers owners to their county health department for free basic testing under the Grants to Counties program. The Iowa Geological Survey explains that where aquifers sit deeper the water has been in contact with minerals longer, which makes natural quality poorer, so well depth is worth knowing before you read any results.

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

Water testing in Leighton: what matters

Leighton, IA water testing: whole-house activated carbon filter tank in a Iowa basement in an older basement
Nitrate: EPA limit 10 mg/L, highest risk to infants →
Water cooler with a large jug in a Iowa kitchen in a farmhouse kitchen (Mahaska County, Iowa)
Arsenic: Iowa DNR says test at least once →

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

Water tests available in Leighton

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.

Leighton 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 Leighton

  • 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 Leighton: 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.
Why does well depth matter for water quality in Mahaska County?
The Iowa Geological Survey says aquifers are used most where they sit near the land surface, where recharge is faster and natural quality is better; deeper aquifers hold water that has been in contact with minerals longer, so quality is poorer. That is a statewide principle, not a Mahaska measurement. Test your own well to see what it delivers.
Should a Leighton buyer look into the coal-mining history under the property?
It is worth a look. Leighton was platted in 1865 by lessees of the Keokuk & Des Moines Railroad, and Mahaska County went on to produce more coal than any other county in Iowa. Iowa DNR publishes a public Iowa Coal Mines map and the state runs a mine-subsidence program, so checking an address against that map costs nothing and settles the question. What we find far more often in Leighton houses is ordinary drift-plain movement — loess over old till, swelling and shrinking seasonally — which is why grading, drainage and settlement cracking lead most of our structural reads here.
Does a septic system have to be inspected when an Iowa home is sold?
Yes, in most sales. Iowa Code 455B.172(11) requires a private sewage disposal system serving a building to be inspected before any transfer of ownership, and the county recorder will not record the deed without the inspector's report or a binding acknowledgment to inspect when weather prevents it. Only a DNR-certified time-of-transfer inspector may do it. Exemptions in the statute include transfers where the system was installed not more than two years earlier. An inspection is valid for two years. Because septic and well separation distances matter for water quality, a buyer of a home with both gets a fuller picture by testing the water alongside the septic report.
Does a septic system have to be inspected when an Iowa home is sold?
Yes, in most sales. Iowa Code 455B.172(11) requires a private sewage disposal system serving a building to be inspected before any transfer of ownership, and the county recorder will not record the deed without the inspector's report or a binding acknowledgment to inspect when weather prevents it. Only a DNR-certified time-of-transfer inspector may do it. Exemptions in the statute include transfers where the system was installed not more than two years earlier. An inspection is valid for two years. Because septic and well separation distances matter for water quality, a buyer of a home with both gets a fuller picture by testing the water alongside the septic report.
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