Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Platte County, Wyoming
EPA puts Platte County in Zone 2, its middle radon zone, and 26.5% of its 132 reported radon tests (2008 to 2017, laboratory totals) were 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
Share at 4+ pCi/L
26.5%
17.8 pts below WY
- Platte
- 26.5%
- Wyoming
- 44.3%
132 tests, 2008 to 2017
Median result
2.4pCi/L
Below action level
- Platte
- 2.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
132
14th of 22 by tests
- Platte
- 132
- Laramie
- 1,834
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Wyoming
20 of 22
Lowest quarter
- Platte
- 26.5%
- Sheridan
- 69.5%
By share, of 22 with 30+ tests
Read a result for Platte County
Starts at Platte County's median, 2.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.4 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 2: moderate predicted potential
Platte County is a
USGS geologic potential: Moderate across 70% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Platte County, 2008 to 2017, laboratory
Under 2 pCi/L: 39%2 to 4 pCi/L: 34%4 pCi/L and above: 27%
Of 132 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 52 | 39.4% |
| 2 to 4 pCi/L | 45 | 34.1% |
| 4 pCi/L and above | 35 | 26.5% |
What these figures count
These are the 132 tests reported to CDC for Platte 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).
Platte County, Compared
Platte County radon figures, compared
Calculated by Radon411Platte County's 132 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.4 pCi/L and a maximum of 19.1 pCi/L, and 26.5% reached 4 pCi/L. Wyoming as a whole (23 Wyoming counties, pooled) comes to 44.3%: 17.8 points higher than here.
Among its state's counties it ranks 20th of 22 Wyoming counties with 30 or more tests for the same period. Statewide for the same period, Sheridan County reported the highest share (69.5%) and Uinta County the lowest (24.6%).
Below the action level, 52 tests (39.4%) came in under 2 pCi/L, against 25.5% statewide, and 45 tests (34.1%) fell between 2 and 4, against 30.2% statewide. CDC's ten-year totals for Platte County went from 130 tests (2005 to 2014) to 132 (2008 to 2017), the share going from 26.2% to 26.5%.
EPA's 1993 zone map puts Platte County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 70% of the county's land moderate radon potential.
Next door, the shares run from 25.5% in Laramie County to 62.3% in Converse County, with Laramie County below Platte County.
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 splits Platte County: 69.9% of its land is moderate radon potential and 30.1% high. The map puts 69.9% of Platte County in the area it calls Tertiary Rocks and 20.8% in Hartville Uplift, with one smaller area beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Tertiary Rocks | Tertiary sandstone, siltstone, and volcanic ash. | Moderate | 11 | 69.9% |
| Hartville Uplift | Precambrian granite and metasedimentary rocks. | High | 12 | 20.8% |
| Laramie Mountains | Precambrian anorthosite, monzonite, gneissic granite, and granite. | High | 12 | 9.3% |
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
Wyoming as a whole has more high-potential ground than Platte County: 72.4% of its land, against 30.1% here. Of the 5 counties that border it, 3 have more high-potential ground, Albany County the most at 99.7%.
The map rates the ground, not the air in any home.
Local help
Platte County, Local resources
Radon testing and mitigation in Platte County
- Wyoming Radon ProgramWyoming Radon Program, run by Wyoming Department of Health, answers questions about testing, mitigation and the rules in Wyoming.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Wyoming2 professionals are listed in Wyoming.
What it means
Platte County, Questions
Questions about radon in Platte County
Are radon levels high in Platte County?
Over the 2008 to 2017 laboratory totals, 26.5% of the radon tests reported to CDC for Platte County, Wyoming were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.4 pCi/L. Of 22 Wyoming counties with 30 or more tests for the same period, 19 reported a higher share; pooled, the state comes to 44.3%.
Which counties border Platte County?
Platte County borders 5 counties: Goshen County, Albany County, Converse County, Niobrara County and Laramie County.
Products
Platte County, Products
Testing a home in Platte County
In Platte County, 26.5% of 132 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 44.3% pooled across Wyoming. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Platte County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Platte County, Bordering counties
Counties bordering Platte County
Calculated by Radon411- Radon levels in Converse CountyEPA zone 1
62.3%at or above 4 pCi/L
Median 4.8 pCi/L · 130 tests · 35.8 points above Platte County
- Radon levels in Goshen CountyEPA zone 1
41.7%at or above 4 pCi/L
Median 3.3 pCi/L · 168 tests · 15.2 points above Platte County
- Radon levels in Albany CountyEPA zone 1
27.9%at or above 4 pCi/L
Median 2.7 pCi/L · 394 tests · 1.4 points above Platte County
- Radon levels in Laramie CountyEPA zone 1
25.5%at or above 4 pCi/L
Median 2.5 pCi/L · 1,834 tests · 1.0 points below Platte County
- Radon levels in Niobrara CountyEPA zone 1
25.0%at or above 4 pCi/L
Median 3.5 pCi/L · 12 tests · 1.5 points below Platte County
Platte County, Cities and towns
Cities and towns in Platte County
Platte County's population has barely moved since 2020: 8,634 residents on July 1, 2025 against 8,632 then, by the Census Bureau's estimates. Spread over its land, that is 4.1 people to the square mile. Its largest town, Wheatland, has 3,516 residents, 40.7% of the total. Together its 5 incorporated places hold 59.1% of those residents; the other 40.9% live outside any of them. CDC's 132 reported tests for 2008 to 2017 work out to 15.3 per 1,000 residents (2025 estimate), close to Wyoming's 13.0.
From Wheatland to Hartville, CDC publishes no figure by town: each reads Platte County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Wheatland | 3,516 | −2.2% | 40.7% |
| Guernsey | 1,104 | −2.2% | 12.8% |
| Glendo | 243 | +3.0% | 2.8% |
| Chugwater | 170 | −4.0% | 2.0% |
| Hartville | 71 | +4.4% | 0.8% |
5 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).
Platte County, Homes
Homes in Platte County
Of Platte County's 4,656 homes, 66% are detached houses, against 68% across Wyoming; 23% are mobile homes. Half of its homes were built before 1976, close to Wyoming's 1980: 28% date from before 1960 and 18% from 2000 or later. 72% of occupied homes are lived in by their owner (Wyoming: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Platte County | Wyoming |
|---|---|---|
| Housing units | 4,656 | 275,131 |
| Detached houses | 66% | 68% |
| In buildings of 5 or more | 5% | 9% |
| Mobile homes | 23% | 12% |
| Built before 1960 | 28% | 24% |
| Built since 2000 | 18% | 24% |
| Middle year built | 1976 | 1980 |
| Owner-occupied | 72% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.