Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Platte County, Missouri
EPA puts Platte County in Zone 1, its highest radon zone, and only 29 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
37.8%
7.2 pts above MO
- Platte
- 37.8%
- Missouri
- 30.6%
1,789 tests, 2008 to 2017
Median result
3.0pCi/L
Below action level
- Platte
- 3.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
1,789
8th of 72 by tests
- Platte
- 1,789
- St. Louis
- 17,747
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Missouri
23 of 72
Middle half
- Platte
- 37.8%
- Atchison
- 69.9%
By share, of 72 with 30+ tests
Read a result for Platte County
Starts at Platte County's median, 3.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.0 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Platte County's median reported result, 2008 to 2017.
The data
Platte County, At a glance
Platte County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Platte County in
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 Platte County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 46.5% |
| 2015 | 38.7% |
| 2016 | 45.0% |
| 2017 | 38.6% |
| 2018 | 33.3% |
| 2019 | 52.6% |
| 2020 | 35.3% |
| 2021 | 45.8% |
| 2022 | 45.9% |
| 2023 | 37.9% |
2023: 37.9%. Across these years the share ran from 33.3% to 52.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 29 tests were reported to CDC for Platte County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Platte County, Compared
Platte County radon figures, compared
Calculated by Radon411In Platte County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (676 of 1,789) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 2.1 points higher. Across 115 Missouri counties pooled together, 30.6% of tests reached that level, so Platte County runs 7.2 points above its state.
The newest figure, in 2023, counts only 29 tests (37.9% at or above 4 pCi/L), too few to compare, so this reading uses the 1,789-test figure.
Of 3 neighbours with a figure, all 3 reported a larger share at or above 4 pCi/L; the spread is 38.1% (Clinton County) to 52.9% (Buchanan County). By share, Platte County is 23rd of 72 Missouri counties with 30 or more tests for the same period.
Year by year, 2014 opened at 46.5% and 2022 closed at 45.9% (about level), with 2014 the high at 46.5%. Half the tests came in under 3.0 pCi/L and half over it; the single highest reached 68.5 pCi/L. Below the action level, 607 tests (33.9%) came in under 2 pCi/L, against 41.2% statewide, and 506 tests (28.3%) fell between 2 and 4, against 28.1% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 37.8% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 37 tests taken after mitigation in Platte County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2016, with 129 tests reported; the quietest, 2019, had 19.
Platte CountyMissouri, pooled
| Year | Tests | Platte County, at or above 4 pCi/L | Missouri, pooled |
|---|---|---|---|
| 2014 | 114 | 46.5% | 34.4% |
| 2015 | 75 | 38.7% | 27.6% |
| 2016 | 129 | 45.0% | 29.8% |
| 2017 | 57 | 38.6% | 37.0% |
| 2018 | 42 | 33.3% | 42.1% |
| 2020 | 51 | 35.3% | 33.2% |
| 2021 | 48 | 45.8% | 31.8% |
| 2022 | 85 | 45.9% | 40.8% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Platte County, Geology
The ground under Platte County
PredictedUSGS's geologic map puts all of Platte County's mapped land in one class: high radon potential. 99.4% of it lies in the area the map calls Northwestern Dissected Till Plains, to which USGS gives a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northwestern Dissected Till Plains | Pennsylvanian shales covered by thick loess. | High | 13 | 99.4% |
| Glacial Drift | Glacial drift and loess of varying thickness, largely locally derived from underlying and nearby Paleozoic sedimentary rocks. | High | 12 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Platte County beside the ground around it
Platte County has more high-potential ground than Missouri as a whole: 100% of its land against 8.2%. Of the 6 counties that border it, none has as large a share of high-potential ground; Buchanan County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Platte County, Local resources
Radon testing and mitigation in Platte County
Listed radon businesses with an address in Platte 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.
Listed radon professionals by town: Kansas City, Smithville, Weston
What Missouri's program says
- Phone
- 573-751-6102
- radon@health.mo.gov
What it means
Platte County, Questions
Questions about radon in Platte County
Are radon levels high in Platte County?
In 2023, 37.9% of the radon tests reported to CDC for Platte County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 22 reported a higher share; pooled, the state comes to 30.6%.
Which counties border Platte County?
Platte County borders 6 counties: Wyandotte County, KS, Clay County, MO, Leavenworth County, KS, Buchanan County, MO, Clinton County, MO and Atchison County, KS.
Products
Platte County, Products
Testing a home in Platte County
In Platte County, 37.8% of 1,789 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.6% pooled across Missouri. In Zone 1 the year-round level in Platte 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
Monitor
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Platte County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Platte County
Explore
Platte County, Bordering counties
Counties bordering Platte County
Calculated by Radon411- Radon levels in Buchanan County, MOEPA zone 1
52.9%at or above 4 pCi/L
Median 4.2 pCi/L · 575 tests · 15.1 points above Platte County
- Radon levels in Clay County, MOEPA zone 1
39.2%at or above 4 pCi/L
Median 3.1 pCi/L · 3,438 tests · 1.4 points above Platte County
- Radon levels in Clinton County, MOEPA zone 1
38.1%at or above 4 pCi/L
Median 2.8 pCi/L · 105 tests · 0.3 points above Platte County
- Radon levels in Wyandotte County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Leavenworth County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Atchison County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Platte County, Cities and towns
Cities and towns in Platte County
Platte County is growing: the Census Bureau puts it at 114,400 residents on July 1, 2025, up 6.7% from 107,187 in 2020. That works out to 273 people per square mile of land. Kansas City, the largest place on its list (521,220 residents in all), extends beyond Platte County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 1,789 reported tests for 2008 to 2017 come to 15.6 for every 1,000 residents (2025 estimate), against 9.3 for Missouri.
From Kansas City to Iatan, CDC publishes no figure by town: each reads Platte County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Kansas Cityextends beyond Platte County | 521,220 | +2.6% | Counted whole |
| Smithvilleextends beyond Platte County | 11,160 | +6.5% | Counted whole |
| Parkville | 9,093 | +21.9% | 7.9% |
| Platte City | 4,911 | +2.8% | 4.3% |
| Riverside | 4,581 | +14.1% | 4.0% |
| Weatherby Lake | 2,139 | +2.6% | 1.9% |
| Weston | 1,855 | +5.5% | 1.6% |
| Lake Waukomis | 941 | +1.2% | 0.8% |
| Ferrelview | 656 | +1.7% | 0.6% |
| Edgerton | 607 | +1.2% | 0.5% |
| Dearbornextends beyond Platte County | 518 | +6.8% | Counted whole |
| Camden Point | 474 | +0.6% | 0.4% |
Places in Platte County with a city page: 1 of 1
- Platte Woods
- Tracy
- Northmoor
- Farley
- Houston Lake
- Ridgely
- Iatan
19 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Platte County is counted whole, so it has no share.
Platte County, Homes
Homes in Platte County
Of Platte County's 46,045 homes, 66% are detached houses, against 70% across Missouri; 19% are in buildings of five or more homes. Much of Platte County is recent building: 34% of its homes have gone up since 2000 and the middle year built is 1991, against 1978 for Missouri. 67% of occupied homes are lived in by their owner (Missouri: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Platte County | Missouri |
|---|---|---|
| Housing units | 46,045 | 2,809,501 |
| Detached houses | 66% | 70% |
| In buildings of 5 or more | 19% | 13% |
| Mobile homes | 1% | 5% |
| Built before 1960 | 11% | 28% |
| Built since 2000 | 34% | 21% |
| Middle year built | 1991 | 1978 |
| Owner-occupied | 67% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.