Skip to content
RADON411

Locations and reports

Radon Levels in Jones County, Iowa

EPA puts Jones County in Zone 1, its highest radon zone, and high results are common there: 59.3% of the 555 radon tests reported to CDC (2008 to 2017, laboratory totals) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    59.3%

    0.8 pts above IA

    Jones
    59.3%
    Iowa
    58.5%

    555 tests, 2008 to 2017

  • Median result

    5.1pCi/L

    Action level reached

    Jones
    5.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    555

    43rd of 99 by tests

    Jones
    555
    Polk
    10,945

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Iowa

    67 of 99

    Middle half

    Jones
    59.3%
    Sioux
    84.2%

    By share, of 99 with 30+ tests

Read a result for Jones County

Starts at Jones County's median, 5.1 pCi/L

5.1pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 5.1 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Jones County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Jones County, At a glance

Jones County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Jones County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Jones County, 2008 to 2017, laboratory

Reported results by concentration band, Jones County, 2008 to 2017, laboratory
Under 2 pCi/L: 17%2 to 4 pCi/L: 24%4 pCi/L and above: 59%

Of 555 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Jones County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L9216.6%
2 to 4 pCi/L13424.1%
4 pCi/L and above32959.3%
What these figures count

These are the 555 tests reported to CDC for Jones County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Jones County, Compared

Jones County radon figures, compared

Calculated by Radon411

More than half: 59.3% of the 555 radon tests reported to CDC for Jones County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 67th of 99 Iowa counties with 30 or more tests for the same period. That is 0.8 points above the 58.5% pooled from 99 Iowa counties.

The median result, 5.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 102.5 pCi/L. The rest split 16.6% under 2 pCi/L and 24.1% from 2 to 4 (Iowa: 21.8% and 19.7%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 59.3% share point the same way here.

1 of its 6 bordering counties with figures ran higher, led by Cedar County at 60.4%; Linn County reported 39.7%. Statewide for the same period, Sioux County reported the highest share (84.2%) and Decatur County the lowest (25.9%).

CDC's ten-year totals for Jones County went from 431 tests (2005 to 2014) to 555 (2008 to 2017), the share going from 59.4% to 59.3%.

Nationally, every county with a figure for the same period pools to 35.7%; Jones County sits 23.6 points above it. CDC also counts 55 tests taken after mitigation in Jones County for the same period: tests in homes where a fix was already in.

Jones County against Iowa, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Jones County
Jones County55559.3%5.1 pCi/LThis county
Iowa, pooled99 counties, pooled95,24558.5%Not pooled−0.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−23.6 points
Sioux Countyhighest in the state1,98284.2%10.7 pCi/L+24.9 points
Decatur Countylowest in the state8525.9%2.5 pCi/L−33.4 points
Cedar County, IAborders it76560.4%5.0 pCi/L+1.1 points
Jackson County, IAborders it1,05652.7%4.1 pCi/L−6.6 points
Clinton County, IAborders it1,37552.7%4.3 pCi/L−6.6 points
Delaware County, IAborders it52050.0%4.0 pCi/L−9.3 points
Dubuque County, IAborders it3,77546.8%3.6 pCi/L−12.5 points
Linn County, IAborders it9,39539.7%3.0 pCi/L−19.6 points
Where Jones County's reported results fell, 2008 to 2017, laboratory, beside Iowa and the United States
ResultJones County testsJones County shareIowa shareU.S. shareAgainst Iowa
Under 2 pCi/L9216.6%21.8%39.6%−5.2 points
2 to 4 pCi/L13424.1%19.7%24.7%+4.4 points
4 pCi/L and above32959.3%58.5%35.7%+0.8 points
Jones County ranked among the 99 Iowa counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Cedar County62 of 9976560.4%5.0 pCi/L
Keokuk County63 of 9921460.3%5.2 pCi/L
Butler County64 of 9937759.9%5.2 pCi/L
Story County65 of 992,56859.9%5.0 pCi/L
Floyd County66 of 9969759.5%5.1 pCi/L
Jones County67 of 9955559.3%5.1 pCi/L
Iowa County68 of 9951959.2%5.1 pCi/L
Chickasaw County69 of 9949859.0%4.9 pCi/L
Cerro Gordo County70 of 991,66259.0%4.8 pCi/L
Dallas County71 of 992,35258.5%4.9 pCi/L
Pottawattamie County72 of 991,86857.4%4.7 pCi/L
Jones County ten-year laboratory totals, against Iowa's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIowa, pooledChange from the row before
2008 to 201755559.3%5.1 pCi/L102.5 pCi/L58.5%+0.4 points
2007 to 201650458.9%5.1 pCi/L102.5 pCi/L58.6%−0.5 points
2006 to 201547359.4%5.2 pCi/L102.5 pCi/L59.4%Level
2005 to 201443159.4%5.3 pCi/L102.5 pCi/L59.6%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Jones County, Geology

The ground under Jones County

Predicted

USGS's geologic map puts all of Jones County's mapped land in one class: high radon potential. The map puts 80.8% of Jones County in the area it calls Loess-Covered Drift Plains and 19.2% in Iowan Surface. USGS gives the first a radon index of 13 and the second 12, both in the high band (12 to 17).

USGS's geologic areas under Jones County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Loess-Covered Drift PlainsPre-Illinoian and Illinoian glacial deposits, and loess.High1380.8%
Iowan SurfacePre-Illinoian glaical deposits and loess.High1219.2%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Jones County beside the ground around it

On high-potential ground Jones County is close to Iowa as a whole: 100% of its land against 98.8%. Of the 6 counties that border it, none has as large a share of high-potential ground; Delaware County comes nearest at 100%.

Share of land by USGS radon potential: Jones County, the 6 counties bordering it and Iowa
AreaEPA zoneLow potentialModerate potentialHigh potential
Jones CountyZone 1NoneNone100%
Cedar CountyZone 1NoneNone100%
Linn CountyZone 1NoneNone100%
Dubuque CountyZone 1NoneNone100%
Jackson CountyZone 1NoneNone100%
Delaware CountyZone 1NoneNone100%
Clinton CountyZone 1NoneNone100%
Iowa99 counties, pooled by land areaVariesNone1.2%98.8%

The map rates the ground, not the air in any home.

Local help

Jones County, Local resources

Radon testing and mitigation in Jones County

Listed radon businesses with an address in Jones County:

Listed radon professionals by town: Anamosa

What Iowa's program says
Phone
(515) 281-4928
Licensing of radon professionals
Iowa’s radon program approves applications for persons who wish to become certified to perform radon testing or credentialed to perform mitigation and laboratories that provide radon testing devices and analytical services.
Disclosure when a home is sold or rented
However, per Iowa Code chapters 543B.9 and 543B.18 and Iowa Administrative Code 193E Chapter 14 administered by the Iowa Real Estate Commission, a seller must disclose any known tests for the presence of radon and if yes, provide the date of last report and the result(s).

What it means

Jones County, Questions

Questions about radon in Jones County

Are radon levels high in Jones County?

Over the 2008 to 2017 laboratory totals, 59.3% of the radon tests reported to CDC for Jones County, Iowa were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.1 pCi/L. Of 99 Iowa counties with 30 or more tests for the same period, 66 reported a higher share; pooled, the state comes to 58.5%.

Which counties border Jones County?

Jones County borders 6 counties: Cedar County, Linn County, Dubuque County, Jackson County, Delaware County and Clinton County.

Products

Jones County, Products

Testing a home in Jones County

In Jones County, 59.3% of 555 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 58.5% pooled across Iowa. In Zone 1 the year-round level in Jones County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Jones County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Jones County

Explore

Jones County, Bordering counties

Counties bordering Jones County

Calculated by Radon411

Jones County, Cities and towns

Cities and towns in Jones County

The Census Bureau estimates 21,253 residents in Jones County for July 1, 2025, 595 more than in 2020 (+2.9%). That works out to 37 people per square mile of land. Its largest town, Anamosa, has 5,901 residents, 27.8% of the total. CDC's 555 reported tests for 2008 to 2017 work out to 26.1 per 1,000 residents (2025 estimate), close to Iowa's 29.4.

From Anamosa to Morley, CDC publishes no figure by town: each reads Jones County's.

The cities and towns in Jones County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Anamosa5,901+8.3%27.8%
Monticello4,104+1.3%19.3%
Cascadeextends beyond Jones County2,399+0.3%Counted whole
Olin656Level3.1%
Wyoming530+0.2%2.5%
Oxford Junction428−0.2%2.0%
Martelle249−0.4%1.2%
Onslow197−0.5%0.9%
Morley94Level0.4%

9 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Jones County is counted whole, so it has no share.

Jones County, Homes

Homes in Jones County

Jones County is a place of houses on their own lots: 81% of its 8,882 homes are detached single-family houses, against 72% across Iowa. Half of its homes were built before 1969, close to Iowa's 1971: 42% date from before 1960 and 17% from 2000 or later. Owners live in 81% of the occupied homes (Iowa: 72%), so for most households a test and a fix are their own to order.

Homes in Jones County, Iowa, 2019 to 2023
HomesJones CountyIowa
Housing units8,8821,427,175
Detached houses81%72%
In buildings of 5 or more5%14%
Mobile homes5%3%
Built before 196042%39%
Built since 200017%21%
Middle year built19691971
Owner-occupied81%72%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.