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
Locations and reports
Radon Levels in Sibley County, Minnesota
EPA puts Sibley County in Zone 1, its highest radon zone, and high results are common there: 60.0% of the 55 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
Share at 4+ pCi/L
60.0%
25.4 pts above MN
- Sibley
- 60.0%
- Minnesota
- 34.6%
55 tests, 2023
Median result
5.0pCi/L
Action level reached
- Sibley
- 5.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
55
48th of 62 by tests
- Sibley
- 55
- Hennepin
- 6,545
Reported to CDC before any fix, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Minnesota
13 of 62
Top quarter
- Sibley
- 60.0%
- Renville
- 75.7%
By share, of 62 with 30+ tests
Read a result for Sibley County
Starts at Sibley County's median, 5.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 5.0 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. Sibley County's median reported result, 2023.
The data
Sibley County, At a glance
Sibley County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Sibley 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 Sibley County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 62.8% |
| 2015 | 73.6% |
| 2016 | 52.1% |
| 2017 | 52.2% |
| 2018 | 79.3% |
| 2019 | 59.4% |
| 2020 | 67.6% |
| 2021 | 64.3% |
| 2022 | 57.6% |
| 2023 | 60.0% |
2023: 60.0%. Across these years the share ran from 52.1% to 79.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 55 tests reported to CDC for Sibley 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).
Sibley County, Compared
Sibley County radon figures, compared
Calculated by Radon411More than half: 60.0% of the 55 radon tests reported to CDC for Sibley County in 2023 read at least 4 pCi/L. That places it 13th of 62 Minnesota counties with 30 or more tests for the same period. That is 25.4 points above the 34.6% pooled from 86 Minnesota counties.
The median result, 5.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 36.5 pCi/L. The rest split 27.3% under 2 pCi/L and 12.7% from 2 to 4 (Minnesota: 36.6% and 28.9%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 60.0% share point the same way here.
2 of its 6 bordering counties with figures ran higher, led by Renville County at 75.7%; Carver County reported 34.6%. Statewide for the same period, Renville County reported the highest share (75.7%) and Lake County the lowest (3.8%).
The busiest year on file was 2014, with 121 tests reported; the quietest, 2019, had 32.
Over 10 years of annual figures the share fell 2.8 points, from 62.8% in 2014 to 60.0% in 2023; its peak was 79.3% in 2018. Nationally, every county with a figure for the same period pools to 33.4%; Sibley County sits 26.6 points above it.
Sibley CountyMinnesota, pooled
60.0% % of tests34.6% % of tests
| Year | Tests | Sibley County, at or above 4 pCi/L | Minnesota, pooled |
|---|---|---|---|
| 2014 | 121 | 62.8% | 42.9% |
| 2015 | 91 | 73.6% | 43.6% |
| 2016 | 71 | 52.1% | 37.0% |
| 2017 | 67 | 52.2% | 38.2% |
| 2018 | 82 | 79.3% | 38.3% |
| 2019 | 32 | 59.4% | 36.1% |
| 2020 | 34 | 67.6% | 31.8% |
| 2021 | 42 | 64.3% | 33.1% |
| 2022 | 59 | 57.6% | 31.6% |
| 2023 | 55 | 60.0% | 34.6% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sibley County, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests in Sibley County, with their period. These are not CDC's figures and are never added to them.
MeasuredState figures, not CDC's
What the Minnesota Department of Health reports for Sibley County
Radon Testing (MN Public Health Data Access Portal): home radon tests reported voluntarily by private laboratories and licensed radon measurement professionals, counted by property. Period: 2016-2025.
Share with one or more tests at or above 4 pCi/L
62.8%
324 properties tested with one or more tests at or above 4 pCi/L
Median result
5.0 pCi/L
Average result
7.4 pCi/L
Tests behind these figures
52 properties tested a year on average
- MDH says these data do not include all of the radon tests conducted in Minnesota.
- Post-mitigation tests are excluded from the averages and the median; the percentages use each property's highest test.
- Each home is unique and can have very different results than a neighbor's home; the only way to know is to test.
- These figures describe tests reported to the Minnesota Department of Health in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.
Measured: Minnesota Department of Health data, 2016-2025.
Sibley County, Geology
The ground under Sibley County
PredictedUSGS's geologic map puts all of Sibley County's mapped land in one class: high radon potential. All of it lies in the area the map calls Central Lowland-Till Prairie, to which USGS gives a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Lowland-Till Prairie | Silty and clayey till derived from shale and sandstone. | High | 14 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sibley County beside the ground around it
Sibley County has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%. Of the 6 counties that border it, none has as large a share of high-potential ground; Carver County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Sibley County, Local resources
Radon testing and mitigation in Sibley County
- MDH Indoor Air UnitMDH Indoor Air Unit, run by MN Dept. of Health, licenses or certifies radon professionals and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Minnesota.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 Minnesota255 professionals are listed in Minnesota.
What Minnesota's program says
- Phone
- 651-201-4601
- health.indoorair@state.mn.us
- Licensing of radon professionals
The Radon Licensing Act requires anyone who performs a radon test or radon mitigation, in a building they do not own or lease, must be licensed by MDH.
- Disclosure when a home is sold or rented
The Minnesota Radon Awareness Act requires specific disclosure and education be provided to potential home buyers during residential real estate transactions in Minnesota.
What it means
Sibley County, Questions
Questions about radon in Sibley County
Are radon levels high in Sibley County?
In 2023, 60.0% of the radon tests reported to CDC for Sibley County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.0 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 12 reported a higher share; pooled, the state comes to 34.6%.
Which counties border Sibley County?
Sibley County borders 6 counties: McLeod County, Nicollet County, Le Sueur County, Carver County, Renville County and Scott County.
Products
Sibley County, Products
Testing a home in Sibley County
In Sibley County, 60.0% of 55 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 1 the year-round level in Sibley 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
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Sibley County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Sibley County
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Sibley County, Bordering counties
Counties bordering Sibley County
Calculated by Radon411- Radon levels in Renville CountyEPA zone 1
75.7%at or above 4 pCi/L
Median 6.3 pCi/L · 37 tests · 15.7 points above Sibley County
- Radon levels in Le Sueur CountyEPA zone 1
62.2%at or above 4 pCi/L
Median 5.1 pCi/L · 135 tests · 2.2 points above Sibley County
- Radon levels in McLeod CountyEPA zone 1
55.7%at or above 4 pCi/L
Median 4.7 pCi/L · 131 tests · 4.3 points below Sibley County
- Radon levels in Nicollet CountyEPA zone 1
45.7%at or above 4 pCi/L
Median 3.7 pCi/L · 129 tests · 14.3 points below Sibley County
- Radon levels in Scott CountyEPA zone 1
41.4%at or above 4 pCi/L
Median 3.4 pCi/L · 669 tests · 18.6 points below Sibley County
- Radon levels in Carver CountyEPA zone 1
34.6%at or above 4 pCi/L
Median 2.8 pCi/L · 489 tests · 25.4 points below Sibley County
Sibley County, Cities and towns
Cities and towns in Sibley County
The Census Bureau estimates 15,356 residents in Sibley County for July 1, 2025, 536 more than in 2020 (+3.6%). That works out to 26 people per square mile of land. Le Sueur, the largest place on its list (4,210 residents in all), extends beyond Sibley County, so no share of the total is worked out for it. CDC's 55 reported tests for 2023 work out to 3.6 per 1,000 residents (2025 estimate), close to Minnesota's 3.9.
From Le Sueur to New Auburn, CDC publishes no figure by town: each reads Sibley County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Le Sueurextends beyond Sibley County | 4,210 | +0.3% | Counted whole |
| Gaylord | 2,353 | +2.9% | 15.3% |
| Arlington | 2,340 | +4.4% | 15.2% |
| Winthrop | 1,341 | +0.9% | 8.7% |
| Henderson | 995 | +4.0% | 6.5% |
| Gibbon | 794 | +1.3% | 5.2% |
| Green Isle | 723 | +23.0% | 4.7% |
| New Auburn | 416 | +1.5% | 2.7% |
8 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 Sibley County is counted whole, so it has no share.
Sibley County, Homes
Homes in Sibley County
Sibley County is a place of houses on their own lots: 84% of its 6,482 homes are detached single-family houses, against 66% across Minnesota. The homes are older than Minnesota's as a whole: half were built before 1962 (1978 for Minnesota), and 48% date from before 1960. Owners live in 81% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.
| Homes | Sibley County | Minnesota |
|---|---|---|
| Housing units | 6,482 | 2,519,538 |
| Detached houses | 84% | 66% |
| In buildings of 5 or more | 9% | 19% |
| Mobile homes | 3% | 3% |
| Built before 1960 | 48% | 29% |
| Built since 2000 | 14% | 22% |
| Middle year built | 1962 | 1978 |
| Owner-occupied | 81% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.