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Radon Levels in Cedar County, Nebraska

EPA puts Cedar County in Zone 1, its highest radon zone, and high results are common there: 78.0% of the 50 radon tests reported to CDC (2023) 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

    78.0%

    39.8 pts above NE

    Cedar
    78.0%
    Nebraska
    38.2%

    50 tests, 2023

  • Median result

    6.8pCi/L

    Action level reached

    Cedar
    6.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    50

    25th of 33 by tests

    Cedar
    50
    Lancaster
    4,058

    Reported to CDC before any fix, 2023

  • 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 Nebraska

    2 of 33

    Top quarter

    Cedar
    78.0%
    Gage
    79.8%

    By share, of 33 with 30+ tests

Read a result for Cedar County

Starts at Cedar County's median, 6.8 pCi/L

6.8pCi/L

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

EPA’s reading of 6.8 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. Cedar County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Cedar County, At a glance

Cedar County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Cedar 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 Cedar County, 2023

Share of reported tests at or above 4 pCi/L, by year, Cedar County
Share of reported tests at or above 4 pCi/L, by year, Cedar County
YearShare of reported tests at or above 4 pCi/L
201473.3%
201577.6%
201674.8%
201775.1%
201865.9%
201968.9%
202063.2%
202170.8%
202237.1%
202378.0%

2023: 78.0%. Across these years the share ran from 37.1% to 78.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 50 tests reported to CDC for Cedar County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Cedar County, Compared

Cedar County radon figures, compared

Calculated by Radon411

More than half: 78.0% of the 50 radon tests reported to CDC for Cedar County in 2023 read at least 4 pCi/L. That places it 2nd of 33 Nebraska counties with 30 or more tests for the same period. That is 39.8 points above the 38.2% pooled from 86 Nebraska counties.

The median result, 6.8 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 34.2 pCi/L. The rest split 14.0% under 2 pCi/L and 8.0% from 2 to 4 (Nebraska: 39.2% and 22.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 78.0% share point the same way here.

No bordering county with a figure for the same period reported a higher share; the closest is Wayne County at 74.4%, the lowest Pierce County at 56.4%. Statewide for the same period, Gage County reported the highest share (79.8%) and Dakota County the lowest (3.1%).

The busiest year on file was 2019, with 666 tests reported; the quietest, 2023, had 50.

Over 10 years of annual figures the share rose 4.7 points, from 73.3% in 2014 to 78.0% in 2023; its peak was 78.0% in 2023. Nationally, every county with a figure for the same period pools to 33.4%; Cedar County sits 44.6 points above it. CDC also counts 20 tests taken after mitigation in Cedar County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Cedar County against Nebraska2014 to 2023, years with 30 or more tests: Cedar County 73.3% to 78.0%, the state's pooled share 38.2% in 2023.
Cedar CountyNebraska, pooled
Share of reported tests at or above 4 pCi/L by year, Cedar County against Nebraska: data table
YearTestsCedar County, at or above 4 pCi/LNebraska, pooled
201434873.3%50.5%
201540277.6%53.3%
201644174.8%47.4%
201750775.1%47.7%
201841465.9%44.5%
201966668.9%44.3%
202037563.2%42.2%
202121670.8%34.9%
202213237.1%34.0%
20235078.0%38.2%
Cedar County against Nebraska, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Cedar County
Cedar County5078.0%6.8 pCi/LThis county
Nebraska, pooled86 counties, pooled11,16338.2%Not pooled−39.8 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−44.6 points
Gage Countyhighest in the state8479.8%9.4 pCi/L+1.8 points
Dakota Countylowest in the state1303.1%0.4 pCi/L−74.9 points
Wayne County, NEborders it4374.4%6.9 pCi/L−3.6 points
Dixon County, NEborders it2272.7%9.1 pCi/L−5.3 points
Knox County, NEborders it4660.9%4.7 pCi/L−17.1 points
Pierce County, NEborders it5556.4%5.0 pCi/L−21.6 points
Where Cedar County's reported results fell, 2023, beside Nebraska and the United States
ResultCedar County testsCedar County shareNebraska shareU.S. shareAgainst Nebraska
Under 2 pCi/L714.0%39.2%41.4%−25.2 points
2 to 4 pCi/L48.0%22.6%25.2%−14.6 points
4 pCi/L and above3978.0%38.2%33.4%+39.8 points
Cedar County ranked among the 33 Nebraska counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Gage County1 of 338479.8%9.4 pCi/L
Cedar County2 of 335078.0%6.8 pCi/L
Seward County3 of 338877.3%7.8 pCi/L
Washington County4 of 337176.1%6.5 pCi/L
Wayne County5 of 334374.4%6.9 pCi/L
Saunders County6 of 339773.2%6.2 pCi/L
Cuming County7 of 333770.3%6.8 pCi/L
Stanton County8 of 333268.8%7.8 pCi/L
Cass County9 of 3311168.5%5.5 pCi/L
Madison County10 of 3321366.7%5.8 pCi/L
Adams County11 of 3315566.5%4.8 pCi/L
Cedar County radon tests by year, against Nebraska's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNebraska, pooledChange from the row before
20235078.0%6.8 pCi/L34.2 pCi/L38.2%+40.9 points
202213237.1%1.6 pCi/L91.6 pCi/L34.0%−33.7 points
202121670.8%6.3 pCi/L109.3 pCi/L34.9%+7.6 points
202037563.2%6.3 pCi/L67.7 pCi/L42.2%−5.7 points
201966668.9%5.6 pCi/L241.4 pCi/L44.3%+3.0 points
201841465.9%5.6 pCi/L77.8 pCi/L44.5%−9.2 points
201750775.1%7.5 pCi/L73.4 pCi/L47.7%+0.3 points
201644174.8%8.1 pCi/L147.7 pCi/L47.4%−2.8 points
201540277.6%8.9 pCi/L44.9 pCi/L53.3%+4.3 points
201434873.3%7.7 pCi/L34.2 pCi/L50.5%First on file

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

Cedar County, Geology

The ground under Cedar County

Predicted

USGS's geologic map puts all of Cedar County's mapped land in one class: high radon potential. The map puts 93.1% of Cedar County in the area it calls Pre-Wisconsin glacial deposits and 6.6% in Sharon Springs. 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 Cedar County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Pre-Wisconsin glacial depositsLoess-mantled glacial drift.High1393.1%
Sharon SpringsCretaceous Pierre Shale bedrock, including the uranium-bearing Sharon Springs Member.High126.6%

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

Cedar County beside the ground around it

Cedar County has more high-potential ground than Nebraska as a whole: 100% of its land against 40.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Clay County, SD comes nearest at 100%.

Share of land by USGS radon potential: Cedar County, the 6 counties bordering it and Nebraska
AreaEPA zoneLow potentialModerate potentialHigh potential
Cedar CountyZone 1NoneNone100%
Dixon CountyZone 1NoneNone100%
Yankton County, SDZone 1NoneNone100%
Clay County, SDZone 1NoneNone100%
Wayne CountyZone 1NoneNone100%
Pierce CountyZone 1None43.2%56.8%
Knox CountyZone 1None20.0%80.0%
Nebraska93 counties, pooled by land areaVaries28.2%30.9%40.9%

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

Local help

Cedar County, Local resources

Radon testing and mitigation in Cedar County

What Nebraska's program says
Phone
(402) 471-1005
Licensing of radon professionals
If radon testing is done in schools, offices, or other places of work, it must be done by a licensed radon measurement business.

What it means

Cedar County, Questions

Questions about radon in Cedar County

Are radon levels high in Cedar County?

In 2023, 78.0% of the radon tests reported to CDC for Cedar County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.8 pCi/L. Of 33 Nebraska counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 38.2%.

Which counties border Cedar County?

Cedar County borders 6 counties: Dixon County, NE, Yankton County, SD, Clay County, SD, Wayne County, NE, Pierce County, NE and Knox County, NE.

Products

Cedar County, Products

Testing a home in Cedar County

In Cedar County, 78.0% of 50 tests reported to CDC in 2023 reached 4 pCi/L, against 38.2% pooled across Nebraska. In Zone 1 the year-round level in Cedar 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

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

Explore

Cedar County, Bordering counties

Counties bordering Cedar County

Calculated by Radon411

Cedar County, Cities and towns

Cities and towns in Cedar County

Cedar County's population has barely moved since 2020: 8,373 residents on July 1, 2025 against 8,373 then, by the Census Bureau's estimates. That works out to 11 people per square mile of land. No town dominates: Hartington, the largest, has 1,530 residents, 18.3% of the total. CDC's 50 reported tests for 2023 work out to 6.0 per 1,000 residents (2025 estimate), close to Nebraska's 5.5.

From Hartington to Obert, CDC publishes no figure by town: each reads Cedar County's.

The cities and towns in Cedar County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Hartington1,530+1.0%18.3%
Laurel961−1.4%11.5%
Randolphextends beyond Cedar County892+0.8%Counted whole
Coleridge522−2.8%6.2%
Wynot221+1.4%2.6%
Fordyce131−0.8%1.6%
Belden111−0.9%1.3%
St. Helena87−1.1%1.0%
Magnet46Level0.5%
Obert22Level0.3%

10 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 Cedar County is counted whole, so it has no share.

Cedar County, Homes

Homes in Cedar County

Cedar County is a place of houses on their own lots: 89% of its 3,904 homes are detached single-family houses, against 72% across Nebraska. The homes are older than Nebraska's as a whole: half were built before 1962 (1975 for Nebraska), and 48% date from before 1960. Owners live in 79% of the occupied homes (Nebraska: 67%), so for most households a test and a fix are their own to order.

Homes in Cedar County, Nebraska, 2019 to 2023
HomesCedar CountyNebraska
Housing units3,904855,631
Detached houses89%72%
In buildings of 5 or more4%17%
Mobile homes3%3%
Built before 196048%32%
Built since 200014%22%
Middle year built19621975
Owner-occupied79%67%

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