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Well Water Testing · Plymouth, IA

Water testing in Plymouth

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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Plymouth · Cerro Gordo County

Well Water Testing in Plymouth

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.

Plymouth is a small town of older homes just northeast of Mason City. Housing here runs to older farm-town homes with postwar additions, across the town core.

Plymouth is served by our Mason City team →  ·  (563) 517-7815

Well water in Cerro Gordo County

Cerro Gordo County has more documented arsenic in private wells than any other Iowa county studied. A State Hygienic Laboratory report on a University of Iowa study of 475 private wells in 91 counties ranked Cerro Gordo first. Follow-up county testing found arsenic in 70 percent of samples, and 38 percent of those exceeded 10 ppb. The highest level on record in Iowa, 540 ppb, was found here. Researchers tie it to the Des Moines Lobe, which has geological arsenic deposits. Iowa DNR recommends every private well be tested for arsenic at least once.

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

Well water around Plymouth, Cerro Gordo County

Plymouth, IA water testing: hose bib on a brick wall at a Iowa home in winter snow
DRO: a screen for diesel and heating-oil petroleum →
Outdoor spigot running clear water at a Iowa home in autumn color (Cerro Gordo County, Iowa)
Coliform bacteria: Iowa DNR recommends testing every year →
Plymouth, IA water testing: small-town water tower in a small Iowa town in winter snow
Nitrate: EPA limit 10 mg/L, highest risk to infants →

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

Water tests available in Plymouth

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.

Plymouth 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 Plymouth

  • 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 Plymouth: 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 is arsenic such a concern for Cerro Gordo County wells?
Cerro Gordo County ranked first among counties in a University of Iowa and State Hygienic Laboratory study of private wells, and county follow-up testing found arsenic in 70 percent of samples. Researchers link it to geological arsenic deposits in the Des Moines Lobe. Because levels vary from well to well, only a test of your own water shows your result.
Do you cover Plymouth?
Yes. Around Plymouth footings set below the locally required frost depth still see settlement cracks and ice-dam wear, and the flat till that was tiled farm ground drains slowly around town basements.
Should I test my well after a flood?
Yes. Iowa DNR says never consume water from a well if flood water may have reached it, and test to find out if it is safe. Test for coliform and E. coli, and nitrate. Floods can raise groundwater loading near a well and surface water can enter through casing defects. Standard bacteria tests do not detect Giardia or Cryptosporidium, so ask the county about State Hygienic Laboratory parasite testing if you suspect flood contamination. After a flood, only lab testing shows whether a well is safe, and a wellhead check can note casing or cap damage.
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.
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