Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Worth County, Missouri
EPA puts Worth County in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
60.9%
Taylor County
- Taylor
- 60.9%
- Ringgold
- 28.7%
3 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
34.2%
Nodaway County, 26 miles
- Nodaway
- 34.2%
- Missouri
- 30.6%
Share at 4+ pCi/L, 225 tests, 2008 to 2017
Ground above low
100.0%
5.8 pts above Missouri
- Worth
- 100.0%
- Missouri
- 94.2%
Share of land USGS rates moderate or high potential
Tests reported
11
Too few for a share
- Worth
- 11
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Worth County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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.
The data
Worth County, At a glance
Worth County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Worth County is a
USGS geologic potential: Moderate across 85% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Worth County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 25.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
2020: 0.0%. Across these years the share ran from 0.0% to 25.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Worth County over 2020, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).
Worth County, Compared
Worth County radon figures, compared
Calculated by Radon411CDC's largest figure for Worth County rests on 11 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 9.1 points and no rank or comparison is drawn from it. Results reached as high as 7.0 pCi/L, with a middle value of 1.5 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Taylor County, IA reported the largest share at or above 4 pCi/L, 60.9%, and Ringgold County, IA the smallest, 28.7%, with Nodaway County at 34.2% between. Farther out, Andrew County (40 miles away) at 60.8%, DeKalb County (40 miles away) at 24.2% and Daviess County (43 miles away) at 26.7% have figures too. Pooled across 115 Missouri counties, 30.6% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Atchison County reported the highest share (69.9%) and Vernon County the lowest (8.8%). EPA's 1993 map puts Worth County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 85% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Worth County, Geology
The ground under Worth County
PredictedMost of the ground under Worth County is one class on USGS's geologic map: 85.0% of its land is moderate radon potential, with 15.0% high. The map puts 85.0% of Worth County in the area it calls Dissected Till Plains and 14.7% in Northwestern Dissected Till Plains. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Dissected Till Plains | Till-covered Pennsylvanian sandstone, shale, and limestone. | Moderate | 11 | 85.0% |
| Northwestern Dissected Till Plains | Pennsylvanian shales covered by thick loess. | High | 13 | 14.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Worth County beside the ground around it
On high-potential ground Worth County is close to Missouri as a whole: 15.0% of its land against 8.2%. Of the 5 counties that border it, 3 have more high-potential ground, Ringgold County, IA the most at 100%.
The map rates the ground, not the air in any home.
Local help
Worth County, Local resources
Radon testing and mitigation in Worth County
- Missouri Radon ProgramMissouri Radon Program, run by Missouri Department of Health and Senior Services, offers free or discounted test kits, and answers questions about testing and mitigation in Missouri.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Free radon test kits are available for Missouri residents (limit one per household).
- Compare kits
- Professionals in Missouri27 professionals are listed in Missouri.
What Missouri's program says
- Phone
- 573-751-6102
- radon@health.mo.gov
What it means
Worth County, Questions
Questions about radon in Worth County
Are radon levels high in Worth County?
In 2020, 0.0% of the radon tests reported to CDC for Worth County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Taylor County, IA reported the largest share at or above 4 pCi/L, 60.9%, and Ringgold County, IA the smallest, 28.7%, with Nodaway County at 34.2% between.
Which counties border Worth County?
Worth County borders 5 counties: Ringgold County, IA, Gentry County, MO, Taylor County, IA, Harrison County, MO and Nodaway County, MO.
Products
Worth County, Products
Testing a home in Worth County
No CDC figure names Worth County; the nearest county with one, Nodaway County (26 miles away), reported 34.2% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Worth County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Worth County, Bordering counties
Counties bordering Worth County
Calculated by Radon411- Radon levels in Taylor County, IAEPA zone 1
60.9%at or above 4 pCi/L
Median 4.6 pCi/L · 235 tests
- Radon levels in Gentry County, MOEPA zone 2
41.7%at or above 4 pCi/L
Median 3.5 pCi/L · 24 tests
- Radon levels in Nodaway County, MOEPA zone 1
34.2%at or above 4 pCi/L
Median 2.7 pCi/L · 225 tests
- Radon levels in Harrison County, MOEPA zone 2
29.2%at or above 4 pCi/L
Median 1.9 pCi/L · 24 tests
- Radon levels in Ringgold County, IAEPA zone 1
28.7%at or above 4 pCi/L
Median 2.6 pCi/L · 87 tests
Worth County, Cities and towns
Cities and towns in Worth County
About 1,914 people live in Worth County by the Census Bureau's estimate for July 1, 2025, 51 fewer than in 2020 (−2.6%). Spread over its land, that is 7.2 people to the square mile. Its largest town, Grant City, has 794 residents, 41.5% of the total. Together its 6 incorporated places hold 57.0% of those residents; the other 43.0% live outside any of them. Reported testing is thin here: 11 tests over 2008 to 2017, or 5.7 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.
From Grant City to Irena, CDC publishes no figure by town: each reads Worth County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Grant City | 794 | −2.5% | 41.5% |
| Sheridan | 142 | −2.7% | 7.4% |
| Worth | 62 | −3.1% | 3.2% |
| Allendale | 48 | −2.0% | 2.5% |
| Denver | 32 | −3.0% | 1.7% |
| Irena | 13 | Level | 0.7% |
6 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).
Worth County, Homes
Homes in Worth County
Worth County is a place of houses on their own lots: 80% of its 1,115 homes are detached single-family houses, against 70% across Missouri. The homes are older than Missouri's as a whole: half were built before 1959 (1978 for Missouri), and 51% date from before 1960. Owners live in 78% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Worth County | Missouri |
|---|---|---|
| Housing units | 1,115 | 2,809,501 |
| Detached houses | 80% | 70% |
| In buildings of 5 or more | 3% | 13% |
| Mobile homes | 8% | 5% |
| Built before 1960 | 51% | 28% |
| Built since 2000 | 13% | 21% |
| Middle year built | 1959 | 1978 |
| Owner-occupied | 78% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.