Buying a House with a Well in Iowa: Is a Well Test Required?

The short answer

What Iowa requires: No statewide law requires a well water test when a home is sold. If the home has a private septic system, most sales need a septic inspection first. The seller also discloses any known wells.
Given to the buyer: A copy of the seller's groundwater hazard statement, which lists any known wells with their approximate location and status (Iowa Code 558.69). It is a disclosure, not a water test.
Septic counts too: Under Iowa Code 455B.172 a home on a private sewage system must have it inspected before sale by an inspector certified by the Iowa DNR. Some transfers are exempt, such as certain family, estate, court-ordered and foreclosure transfers, or a system installed within the past two years. If weather delays the inspection, the buyer can sign an agreement with the county to have it done as soon as practical.
When a test can still be required: Your lender or your purchase agreement can call for one. FHA requires a well test in certain cases, such as new construction or a well less than 100 feet from a septic system. It is also worth asking your county environmental health office about local rules.
What the Iowa DNR advises: Check the well and water before you buy, including coliform bacteria and nitrate, plus an arsenic test. Many counties offer these tests at low or no cost through Iowa's Private Well Grants program.
What testing misses: Those tests say nothing about hardness, iron, manganese, hydrogen sulfide or total dissolved solids; the EPA's secondary standards are 0.3 mg/L for iron and 0.05 mg/L for manganese.
Existing equipment proves nothing: A softener in the basement is not proof of soft water, since it may be bypassed, media-spent or dead, so ask its age and service records and test at the tap after closing.
Budget figures: A well dual-tank system is $3,450, or $3,800 with a tank reverse osmosis system; UV disinfection is $700 plus $300 per lamp, and a pre-sediment filter is $500.

If you are buying a rural Iowa home on a private well, this is the part many buyers get wrong: Iowa law doesn't require a well water test when a home is sold. If the home has a private septic system, most sales need a septic inspection first, and the seller lists any known wells on the groundwater hazard statement — but neither step tests the water. A test can still come from your lender or your purchase agreement, and the Iowa DNR advises checking the well and water before you buy. Here is what the rules cover, what to test, and what it costs to fix what a test finds.

What Iowa's rules cover when a home is sold

Iowa administers time-of-transfer septic inspections through the Iowa DNR under Iowa Code 455B.172, and known wells are disclosed under Iowa Code 558.69. Two separate things are in play on a rural property:

System	What the rules require at transfer
Private sewage / septic	Every home served by a private sewage disposal system must have that system inspected before the sale or deed transfer, by an inspector certified by the Iowa DNR. It covers property with one to four dwelling units, such as a house or a duplex. If weather or another temporary condition prevents the inspection, the buyer can sign a binding agreement with the county board of health to have it done as soon as practical and to make any required repairs. Some transfers are exempt, including court-ordered transfers such as foreclosures, bankruptcy sales and eminent domain; deeds in lieu of foreclosure and a lender's later sale of a home it took back; transfers by an executor, trustee, guardian or conservator; transfers between co-owners; transfers to a spouse or to a child, grandchild, parent, grandparent or other direct-line relative; transfers between spouses under a divorce or legal separation decree; sales to a buyer who intends to demolish the building; partition and tax-sale deeds; transfers for five hundred dollars or less; certain family business transfers; and sales of a property whose system was installed not more than two years before the transfer
Private well	No statewide rule requires the well to be inspected or the water tested at sale. The seller must list any known wells on the groundwater hazard statement, with each well's approximate location and status, and give the buyer a copy (Iowa Code 558.69). That is a disclosure, not a water test. Iowa's statewide well-sampling rule covers new, rebuilt or reworked wells, not sales

System

What the rules require at transfer

Private sewage / septic

Every home served by a private sewage disposal system must have that system inspected before the sale or deed transfer, by an inspector certified by the Iowa DNR. It covers property with one to four dwelling units, such as a house or a duplex. If weather or another temporary condition prevents the inspection, the buyer can sign a binding agreement with the county board of health to have it done as soon as practical and to make any required repairs. Some transfers are exempt, including court-ordered transfers such as foreclosures, bankruptcy sales and eminent domain; deeds in lieu of foreclosure and a lender's later sale of a home it took back; transfers by an executor, trustee, guardian or conservator; transfers between co-owners; transfers to a spouse or to a child, grandchild, parent, grandparent or other direct-line relative; transfers between spouses under a divorce or legal separation decree; sales to a buyer who intends to demolish the building; partition and tax-sale deeds; transfers for five hundred dollars or less; certain family business transfers; and sales of a property whose system was installed not more than two years before the transfer

Private well

No statewide rule requires the well to be inspected or the water tested at sale. The seller must list any known wells on the groundwater hazard statement, with each well's approximate location and status, and give the buyer a copy (Iowa Code 558.69). That is a disclosure, not a water test. Iowa's statewide well-sampling rule covers new, rebuilt or reworked wells, not sales

A water test can still be part of your purchase. Your lender may require one: FHA requires a well test in certain cases, including new construction, a problem the appraiser reports with the well or water, water that is reported or known to be unsafe, a well less than 100 feet from the septic system, and a home close to farms, landfills or industrial sites, and its list isn't limited to those. If you're using a VA or USDA loan, ask your lender what that program requires for well water. Your purchase agreement's inspection terms can lead to a test too. Read your agreement, ask your lender early, and check with your county environmental health office about local rules.

Confirm the specifics for your transaction with your county environmental health office, your lender, your realtor, and a DNR-certified septic inspector — exemptions exist and county administration varies. We install water treatment; we are not your inspector or your attorney.

What a bacteria and nitrate test does not tell you

Coliform bacteria and nitrate, plus at least one arsenic test, are the Iowa DNR's recommended starting point for a private well, and they are only a starting point. None of those results tells you:

Hardness. Whether you will be buying a softener in month two. Unsoftened Iowa well water is typically hard — nearby city figures run 14 to 20 grains per gallon where they are published.
Iron and manganese. The cause of orange staining on fixtures and laundry, and black specks. The EPA's secondary standards are 0.3 mg/L for iron and 0.05 mg/L for manganese, both set for aesthetic reasons.
Hydrogen sulfide. The rotten-egg smell. Often more noticeable in hot water first.
Total dissolved solids. Which determines whether a tank or tankless RO is appropriate — on wells it is always a tank RO.
Whether the existing equipment works. A softener in the basement is not proof of soft water. It may be bypassed, media-spent or dead.

The buyer's checklist, in order

Find out who requires a water test — Iowa law doesn't, but your lender or your purchase agreement might. Ask your lender early, read the agreement's inspection terms and deadlines, and ask your county environmental health office about local rules.
Ask about abandoned wells on the property. The seller's groundwater hazard statement must list known wells with their location and status, and you get a copy. An unplugged old well is an open pipe into the aquifer and a future contamination pathway.
Ask the well's age, depth and aquifer. Depth predicts a great deal. Deep Cambrian-Ordovician wells are rated low susceptibility to surface contamination by the Iowa DNR; shallow alluvial and Silurian wells in this region are frequently rated susceptible or highly susceptible.
Inspect the wellhead yourself. Is the cap sealed and intact? Is the casing above grade and sound? Does the ground slope away? Is it downhill from a feedlot, septic field or fuel tank?
Ask what treatment equipment conveys — and its age. Softener, iron filter, UV, RO. Ask for service records. Ask whether the UV lamp has ever been replaced; the answer is often no, which means it has not been working.
Test the water before closing, and get the results in writing. The Iowa DNR advises checking coliform bacteria and nitrate, plus an arsenic test. Many counties offer these tests at low or no cost through Iowa's Private Well Grants program, so call your county environmental health office early. Read the results; do not just accept that testing "was done." We screen hardness, iron and TDS free; our screening doesn't test for bacteria, nitrate or arsenic, which need a certified laboratory. A positive bacteria result needs professional follow-up: your county environmental health office or a certified well contractor can assess the well, find the cause, repair or disinfect it as needed, and retest before you rely on the water.
Retest annually after that. The Iowa DNR recommends testing private wells every year for coliform bacteria and nitrate, and having at least one arsenic test done.

What it costs to fix what you find

So you can budget before closing rather than after. All-in: equipment, installation by a licensed plumbing professional, taxes, lifetime parts warranty.

What the test found	Typical fix	Price
Hard water only	Well dual-tank system	$3,450 (with tank RO: $3,800)
Nitrate at the drinking tap	Tank reverse osmosis	$800
Coliform bacteria or E. coli	Professional follow-up: your county environmental health office or a certified well contractor assesses the well, finds the cause, repairs or disinfects it as needed, and retests	Set by your county or well contractor
Well water that has already tested safe	Supplemental UV (NSF/ANSI 55 Class B)	$700 ($300 per lamp, every 6–12 months)
Sediment or turbidity	Pre-sediment filter	$500
Heavy iron, sulfur or manganese	Iron and sulfur build	Quoted after a free water test — the configuration depends on your numbers
Ongoing upkeep	Annual service (filters, test, system check)	$199/yr tank RO home · $249/yr tankless

0% financing; $100 off for military and first responders. Structural well problems — casing, seal, plugging an abandoned well — are a licensed well contractor's job, not ours, and we will say so rather than selling equipment around a hole in the ground.

Realtors: we will test before closing

If you have a rural listing or a buyer under contract, we will run a free hardness, iron and TDS test and give a written equipment quote your client can use in negotiation. It doesn't cover bacteria, nitrate or arsenic; those need a certified laboratory. No obligation and no pressure to buy from us — a number on paper is more useful to a deal than a guess.

Call or text 319-319-6566, email ryan@kindwaterco.com, or get an instant quote. More: well water guide, bacteria and coliform, nitrates in Iowa water, free well testing.

Frequently asked questions

Is a well test required when selling a house in Iowa?

Iowa law doesn't require a well water test when a home is sold. If the home has a private septic system, most sales need a septic inspection first (Iowa Code 455B.172), though some transfers are exempt, such as certain family, estate and foreclosure transfers, or a system installed within the past two years. The seller also lists any known wells on the groundwater hazard statement (Iowa Code 558.69). Neither step tests the water. A water test can still come from your lender, since FHA requires one in certain cases such as new construction or a well near a septic system or farm fields, or from your purchase agreement and its inspection terms. Read yours, ask your lender, and check with your county environmental health office about local rules. The Iowa DNR advises checking the well and water before you buy, including coliform bacteria and nitrate, plus an arsenic test. Many counties offer these tests at low or no cost through Iowa's Private Well Grants program.

Does Iowa require a septic inspection when a house is sold?

Iowa's time-of-transfer law under Iowa Code 455B.172 requires that a home served by a private sewage disposal system have that system inspected before sale or deed transfer, by an inspector certified by the Iowa DNR. It covers property with one to four dwelling units, such as a house or a duplex. If weather or another temporary condition prevents the inspection, the buyer can sign a binding agreement with the county board of health to have it done as soon as practical and to make any required repairs. Some transfers are exempt, including court-ordered transfers such as foreclosures, bankruptcy sales and eminent domain; deeds in lieu of foreclosure and a lender's later sale of a home it took back; transfers by an executor, trustee, guardian or conservator; transfers between co-owners; transfers to a spouse or to a child, grandchild, parent, grandparent or other direct-line relative; transfers between spouses under a divorce or legal separation decree; sales to a buyer who intends to demolish the building; partition and tax-sale deeds; transfers for five hundred dollars or less; certain family business transfers; and sales of a property whose system was installed not more than two years before the transfer.

What does a coliform and nitrate test not cover?

Hardness, iron, manganese, hydrogen sulfide and total dissolved solids. Coliform bacteria and nitrate, plus an arsenic test, are the tests the Iowa DNR recommends for a private well, but they say nothing about whether you will be buying a softener, whether fixtures will stain orange, or whether the water smells like rotten eggs. Those need a separate test.

The house has a water softener already — is that good enough?

Not necessarily. Equipment in a basement is not proof of soft water: it may be bypassed, media-spent or dead. Ask for the age and service records, and test the water at the tap after closing. A UV lamp that has never been replaced has not been disinfecting anything.

What should I budget for well water treatment after buying?

A well dual-tank system is $3,450, or $3,800 with a tank reverse osmosis system. UV disinfection is $700 plus $300 per lamp. A pre-sediment filter is $500. Iron and sulfur builds are quoted after a free water test because the configuration depends entirely on your numbers.

Buying a House with a Well in Iowa: What's Required and What to Test