Radon Crew, LLC
Sioux Falls, SD
Listed for: Mitigation
Verified:Iowa state license
Call Radon Crew, LLC at (605) 336-1000No website listed
Locations and reports
Radon in Sioux Falls, South Dakota
Sioux Falls lies in 2 counties, in EPA Zone 1; 83.3% of it is in Minnehaha County, where 58.5% of 1,920 reported tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so the only way to know your home's level is to test it.
Data checked By Radon411Methodology
Share at 4+ pCi/L
58.5%
0.0 pts above SD
- Minnehaha
- 58.5%
- SD
- 58.5%
Minnehaha, 14th of 23 in SD, 2008 to 2017
Median result
4.8pCi/L
Action level reached
- Minnehaha
- 4.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Minnehaha's tests, 2008 to 2017
Highest county
58.5%
Minnehaha
- Minnehaha
- 58.5%
- Lincoln
- 56.5%
2 counties, 2 with 30+ tests, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Minnehaha; Lincoln Zone 1
Tests reported
1,920
In Minnehaha
- Minnehaha
- 1,920
- Lincoln
- 795
Reported to CDC before any fix, 2008 to 2017
Read a result for Sioux Falls
Starts at Minnehaha County's median, 4.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.8 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. Minnehaha County's median reported result, 2008 to 2017.
The data
Sioux Falls, What is published
What is published for Sioux Falls
Information:
Every figure for Sioux Falls is a county's
Radon data is published by county, not by city, and Sioux Falls reaches into 2 counties: Minnehaha County and Lincoln County. Each has its own EPA zone and its own CDC test figures, set side by side below and each labelled with its county. Only a test tells you about one home.
Sioux Falls covers 79.1 square miles of land: 83.3% of it lies in Minnehaha County and 16.7% in Lincoln County. About 213,748 people live there, 2,703 to the square mile.
Sioux Falls, Counties
Sioux Falls' counties, side by side
MeasuredEach county's own EPA zone and its own published CDC figures for 2008 to 2017, laboratory, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.
- Minnehaha County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 58.5%
- Median result
- 4.8 pCi/L
- Tests reported
- 1,920 tests
- Annual years on file
- None
- Lincoln County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 56.5%
- Median result
- 4.7 pCi/L
- Tests reported
- 795 tests
- Annual years on file
- None
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| Minnehaha County | Zone 1: Highest predicted potential | 58.5% | 4.8 pCi/L | 1,920 tests | None |
| Lincoln County | Zone 1: Highest predicted potential | 56.5% | 4.7 pCi/L | 795 tests | None |
Sioux Falls spans 2 counties, each with its own EPA zone and its own CDC figure: Minnehaha County (Zone 1, 58.5% of 1,920 tests) and Lincoln County (Zone 1, 56.5% of 795 tests).
Minnehaha County ranks 14th of 23 South Dakota counties with 30 or more tests for that period, 0.0 points above the 58.5% pooled across South Dakota's counties, 22.8 points above the national pool of 35.7%. Of the city's other county, Lincoln County reported 56.5%.
Measured from the middle of Sioux Falls, the nearest counties with a CDC figure for 2008 to 2017, laboratory are Turner County (26 miles, 58.6% of 58 tests), McCook County (33 miles, 50.0% of 30 tests) and Lake County (39 miles, 76.0% of 50 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 50.0% to 76.0%; the farthest of them, Brookings County, is 57 miles away at 68.5%.
The directory lists 1 business with an address in Sioux Falls, 1 for mitigation. South Dakota's other cities with a page of their own: Rapid City and Aberdeen.
Against South Dakota and its other counties
Shares of tests people chose to run and report, by county (2008 to 2017, laboratory); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.
The counties around Sioux Falls
By distance from the middle of Sioux Falls; counties with 30 or more tests.
The median reported pre-mitigation result for 2008 to 2017, laboratory was 4.8 pCi/L in Minnehaha County and 4.7 pCi/L in Lincoln County.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Sioux Falls, Geology
The ground under Sioux Falls
PredictedUSGS's geologic map puts all of Sioux Falls' mapped land in one class: high radon potential. The map puts 61.0% of Sioux Falls in the area it calls Loess-Covered Drift Plains and 39.0% in Missouri Coteau/James River Lowland/Coteau des Prairies. USGS gives the first a radon index of 13 and the second 14, both in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Loess-Covered Drift Plains | Pre-Illinoian and Illinoian glacial deposits, and loess. | High | 13 | 61.0% |
| Missouri Coteau/James River Lowland/Coteau des Prairies | Glacial drift derived largely from Cretaceous marine shale. | High | 14 | 39.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sioux Falls beside its counties and South Dakota
The ground under Sioux Falls is close to Minnehaha County's as a whole: 100% rated high against 99.9%. Sioux Falls has more high-potential ground than South Dakota as a whole: 100% of its land against 56.7%.
The map rates the ground, not the air in any home.
Sioux Falls, Homes
Homes in Sioux Falls
Fewer than six in ten of Sioux Falls' 87,121 homes are detached houses (53%, against 60% across Minnehaha County); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1992, close to Minnehaha County's 1986: 20% date from before 1960 and 40% from 2000 or later. 60% of occupied homes are lived in by their owner (Minnehaha County: 64%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Sioux Falls | Minnehaha County | South Dakota |
|---|---|---|---|
| Housing units | 87,121 | 87,043 | 402,364 |
| Detached houses | 53% | 60% | 67% |
| In buildings of 5 or more | 29% | 26% | 16% |
| Mobile homes | 4% | 4% | 8% |
| Built before 1960 | 20% | 23% | 29% |
| Built since 2000 | 40% | 32% | 28% |
| Middle year built | 1992 | 1986 | 1979 |
| Owner-occupied | 60% | 64% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Sioux Falls, Professionals
Radon professionals listed in Sioux Falls
Businesses whose listed city is Sioux Falls, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Sioux Falls: 1 of 1
1 listing with Sioux Falls as the city. See radon mitigation in Sioux Falls, or all radon professionals in South Dakota.
Sioux Falls, Local resources
Local resources for Sioux Falls
Who to ask in South Dakota: its radon program, test kits and professionals.
- South Dakota's radon programDepartment of Agriculture and Natural Resources, phone 1-800-438-3367.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The Department of Agriculture and Natural Resources (DANR) will provide 500 free Radon test kits to South Dakota Residents.
- Compare kits
- Professionals in South Dakota1 listing covers Sioux Falls.
The program's own words on licensing are on the South Dakota page.
What it means
Sioux Falls, Questions
Questions about radon in Sioux Falls
What radon zone is Sioux Falls in?
Both counties Sioux Falls reaches into (Minnehaha County and Lincoln County) are in Zone 1, the map's highest class: a predicted county average above 4 pCi/L. EPA zones counties, not cities, so that is the zone for every part of Sioux Falls.
What are radon levels in Sioux Falls?
High results are ordinary around Sioux Falls: 58.5% of the 1,920 tests reported from Minnehaha County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home. The median reported result was 4.8 pCi/L. Lincoln County reported 56.5% of 795 tests; the counties are kept apart.
Should I test my home in Sioux Falls?
Yes. Minnehaha County reported about 1,123 of its 1,920 tests at or above 4 pCi/L. That is about what South Dakota as a whole reports (58.5%), and ranks Minnehaha County 14th of the 23 South Dakota counties with 30 or more tests. Which homes they were, no map can say. How to test a home.
What ground is Sioux Falls built on, as far as radon goes?
61.0% of Sioux Falls sits on what USGS's map calls "Loess-Covered Drift Plains", rated high for radon potential, radon index 13; another 39.0% is "Missouri Coteau/James River Lowland/Coteau des Prairies", in the same class.
Is radon higher in the counties around Sioux Falls?
It depends which way you go. 5 of the 8 nearest counties with a figure report a larger share than Minnehaha County's 58.5% and 3 a smaller one: from McCook County (50.0%, 33 miles off) to Lake County (76.0%, 39 miles off).
Who tests for or fixes radon in Sioux Falls?
Sioux Falls is the address of one business in Radon411's directory, listed for mitigation, none for testing. Each entry names the public list it came from. Radon professionals in Sioux Falls.
The answers use the published figures of Minnehaha County and Lincoln County, the counties Sioux Falls lies in.
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