About 33% of the county's 10,974 residents. Rank 56 of 99 in Iowa.
95% range 1,118 to 1,648 private-well users (2010 base year). Rank 4 of 99 in Iowa.
Highest potential (average indoor radon may be greater than 4 pCi/L). EPA says the map should not be used to decide whether an individual home needs testing.
Labs with an address in this county, from the official state lists on this site, matched by ZIP code.
What to test for in Hancock County
Private wells are not regulated like public water: EPA advises owners to test their well every year for total coliform bacteria, nitrates, total dissolved solids and pH. Your state's own schedule:
- Iowa DNR says every private well used for drinking should be tested at least once a year. Also test when the well is new, after any work on the well, pump or water system, and when the water looks, smells or tastes different. source
- For the tests covered by the Private Well Grants program, Iowa DNR lists bacteria (coliform and E. coli) and nitrate every year, and arsenic and manganese every three years. source
Arsenic. USGS estimates that about 1,397 people using private wells in Hancock County had arsenic above 10 µg/L, EPA's limit for public water (2010 base year; 95% range 1,118 to 1,648). USGS describes this kind of estimate as useful "for broad screening of the population at risk", so it says nothing certain about any one well. Arsenic has no taste or smell: test for it by name.
Radon. EPA puts Hancock County in Zone 1: highest potential (average indoor radon may be greater than 4 pCi/L). That map is about radon in indoor air, and EPA says it should not be used to decide whether an individual home needs testing. If radon is found in your air and you have a well, EPA suggests testing the water too: see radon in well water.
For anything specific to your home (farms nearby, old plumbing, a new baby, a smell or stain), use the which-tests checklist. When the results arrive, check your numbers against EPA's limits.
Show the numbers
| Item | Value | Note |
|---|---|---|
| Kossuth County | 1,662 people (2010 base year) | |
| Webster County | 1,543 people (2010 base year) | |
| Boone County | 1,532 people (2010 base year) | |
| Hancock County (this county) | 1,397 people (2010 base year) | |
| Dallas County | 967 people (2010 base year) | |
| Pottawattamie County | 945 people (2010 base year) |
USGS model estimate for broad screening, not a measurement of any well. Only a test tells you about your own well. Source: USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017), accessed 2026-11-01.
Testing programs and help in Iowa
- Iowa's Private Well Grants program provides free water testing to private well owners through county environmental health offices. Iowa DNR says nearly all counties take part; ask your county office whether yours does and to arrange sampling. source
- The standard free tests are nitrate, bacteria, manganese and arsenic. A county health specialist must collect the sample. Requests to cover other tests are reviewed case by case. source
- The same program reimburses qualifying well services done by a DNR-certified contractor, at actual cost up to $400 for shock chlorination, $600 for a well assessment, $700 for well plugging, $400 for cistern plugging and $2,000 for well reconstruction or rehabilitation. Contact your county health department before the work starts. source
Buying a home with a well in Hancock County
Loan test (FHA, VA, USDA) in Hancock County, IA
- VA. Test results are valid for 90 days from the date the local health authority certifies them, unless the local authority says otherwise. VA’s chapter names no list of contaminants: the water must meet the local health authority’s requirements, or EPA guidelines where it has none. Your lender may ask for specific tests.
- FHA. A well test is required in the situations FHA’s handbook lists, among others, and the report may not be more than 180 days old at disbursement.
- USDA. Guaranteed loans need a water quality test for a private well, done by the local health authority or a state-certified lab, and no more than 180 days old at closing.
Lenders can ask for more (extra tests, a particular lab, who takes the sample): ask your lender before you book. Federal rules as read on Nov 3, 2026 source 1 source 2 source 3. Full comparison: VA, FHA and USDA well water test requirements. Loan test kits sold by mail, with price and days to results: kits compared.
State-certified labs in Hancock County
None of the labs on our Iowa list has an address in Hancock County. Labs elsewhere in the state may take samples by mail or courier: ask the lab, and check the hold time for bacteria before you send one.
Labs on the Iowa list whose own websites say they take homeowner samples: AgSource (Ellsworth), ChemRight Laboratories (Maquoketa), Dubuque - City Environmental Monitoring Lab (Dubuque), Dubuque County Health Department (Dubuque). Use Check my ZIP to sort labs by distance.
See all Iowa labs in the finder and filter by the test you need and by labs that take homeowner samples.
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017)
- U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001)
- U.S. Census Bureau, 2020 ZCTA to county relationship file (lab ZIP codes to counties)
- Iowa DNR LabCert - List of Certified Labs (Drinking Water program) + Find a Lab analyte search + Lab Details (Date Generated: 11/14/2026 (LabCert, live database))
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