Septic inspection when selling a house in Iowa

1 statewide rule and 0 local rules from official sources.

General information, not legal advice. This is our summary of the official rule as we read it. The ordinance or code and the health department decide: confirm with them before you list, sign or close.

Statewide: septic system at sale

Buildings with 1 to 4 dwelling units served by a private sewage disposal system. The state rule replaces city and county rules.

Question	What the official text says
What is required	Time-of-transfer inspection by DNR-certified inspector; septic tank opened and pumped (or pumped within prior 3 years with documentation); report to county board of health and DNR Source: legis.iowa.gov
Triggered by	any transfer of ownership of a building (1-4 dwelling units), including seller-financed contract signing Source: legis.iowa.gov
Deadline	before deed recorded; county recorder will not record without inspector's report or buyer's binding acknowledgment (weather) Source: legis.iowa.gov
Who arranges it	Not named in the statute. If the system fails, the seller renovates it or, by written agreement, the buyer does Source: legis.iowa.gov
How long a report is valid	inspection valid 2 years for transfers in that period Source: legis.iowa.gov
Exemptions	Transfers under a court order (including probate, execution of a judgment, foreclosure, forfeiture of a real estate contract, a bankruptcy trustee, eminent domain and specific performance) Transfers to a mortgagee by a defaulting mortgagor, by a mortgagee after a deed in lieu or foreclosure, or back to the mortgagor under a right of first refusal Transfers by a fiduciary administering a decedent's estate, guardianship, conservatorship or trust Transfers between joint tenants or tenants in common Transfers to a spouse or lineal relative Transfers between spouses under a dissolution or legal separation decree The buyer will demolish or raze the building The system was installed not more than two years before the transfer Partition deeds County treasurer tax sale deeds Consideration of $500 or less Family corporation, partnership or LLC deeds for no consideration other than shares Source: legis.iowa.gov
If the system fails	Failing system must be renovated to current standards by seller or, by agreement and within reasonable time, by buyer; properly working systems need not meet current standards Source: legis.iowa.gov
Who may inspect	Iowa DNR (certification exam plus DMACC training). official list (programs.iowadnr.gov) The list names individual inspectors; we link to it instead of copying it. Source: iowadnr.gov
Official forms	iowadnr.gov Source: iowadnr.gov

Official ruleIowa Code 455B.172(11); 567 IAC Chapter 69

Checked on November 9, 2026: read on the official site.

Read the rule (legis.iowa.gov)

Programme page (iowadnr.gov)

Private wells in Iowa

About 494,022 of Iowa’s 3,123,899 residents (16%) got their drinking water from a private well in 2015, by the USGS estimate.

Source: USGS county water use 2015 (Dieter et al., 2018); 99 counties in the USGS table.

Where private wells (and usually septic systems) are most common

Iowa ranks 25 of 45 states and territories by people on private wells (USGS 2015). In 2 of its 99 counties more than half of residents drink from a private well; homes there usually also treat wastewater on site, so a septic check and a well test tend to come up together at sale. The highest shares:

Davis County: 63% of 8,769 residents on a private well
Van Buren County: 54% of 7,344 residents on a private well
Delaware County: 47% of 17,403 residents on a private well
Allamakee County: 46% of 13,886 residents on a private well
Ringgold County: 46% of 5,068 residents on a private well
Mills County: 45% of 14,844 residents on a private well
Clayton County: 45% of 17,644 residents on a private well
Monroe County: 44% of 7,973 residents on a private well

USGS county water use 2015 (Dieter et al., 2018). The USGS table counts well users, not septic systems; no national county count of septic systems exists.

Soils for septic drain fields in Iowa

Across the 99 counties with USDA soil survey data, 92% of rated land is “very limited” for a conventional septic drain field. Most limited: Washington County (100%), Keokuk County (100%), Henry County (100%). Least limited: Woodbury County (55%), Harrison County (56%), Dallas County (66%).

Source: USDA NRCS Soil Survey Geographic Database (SSURGO), via Soil Data Access, rating “ENG - Septic Tank Absorption Fields”, read November 15, 2026. County-wide ratings, not a test of one lot.

How the neighbouring states compare

Iowa has a statewide rule. Of its 6 neighbouring states, 0 have a statewide rule at sale; a buyer moving across the line may meet a different rule. From our register of official rules:

Minnesota: no statewide rule; 59 local rules (counties, cities or townships).
Nebraska: no statewide rule; 1 local rule (counties, cities or townships).
South Dakota: no statewide rule; 1 local rule (counties, cities or townships).
Wisconsin: state law bars local point-of-sale rules.

Testing a well? See certified well-water labs and testing advice in Iowa.

Other states: all states.