Locations and reports
Radon in Springfield, Missouri
Springfield lies in 2 counties, in EPA Zone 2; 100% of it is in Greene County, where 27.1% of 48 reported tests (2023) 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
27.1%
8.6 pts below MO
- Greene
- 27.1%
- Missouri
- 35.7%
Greene, 6th of 7 in MO, 2023
Median result
2.9pCi/L
Below action level
- Greene
- 2.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Greene's tests, 2023
Highest county
31.6%
Christian
- Christian
- 31.6%
- Greene
- 27.1%
2 counties, 2 with 30+ tests, 2023
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
Greene; Christian Zone 2
Tests reported
48
In Greene
- Greene
- 48
- Christian
- 452
Reported to CDC before any fix, 2023
Read a result for Springfield
Starts at Greene County's median, 2.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.9 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. Greene County's median reported result, 2023.
The data
Springfield, What is published
What is published for Springfield
Every figure for Springfield is a county's
Radon data is published by county, not by city, and Springfield reaches into 2 counties: Greene County and Christian 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.
Springfield covers 82.4 square miles of land, all of it in Greene County. About 169,847 people live there, 2,061 to the square mile.
Springfield, Counties
Springfield's counties, side by side
MeasuredEach county's own EPA zone and its own published CDC figures for 2023, 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.
- Greene County
- EPA zone
- Zone 2: Moderate predicted potential
- At or above 4 pCi/L
- 27.1%
- Median result
- 2.9 pCi/L
- Tests reported
- 48 tests
- Annual years on file
- 10
- Christian County
- EPA zone
- Zone 2: Moderate predicted potential
- At or above 4 pCi/L
- 43.5%
- Median result
- 2.7 pCi/L
- Tests reported
- 23 tests
- Annual years on file
- 10
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| Greene County | Zone 2: Moderate predicted potential | 27.1% | 2.9 pCi/L | 48 tests | 10 |
| Christian County | Zone 2: Moderate predicted potential | 43.5% | 2.7 pCi/L | 23 tests | 10 |
Springfield spans 2 counties, each with its own EPA zone and its own CDC figure: Greene County (Zone 2, 27.1% of 48 tests) and Christian County (Zone 2, 43.5% of 23 tests).
Greene County ranks 6th of 7 Missouri counties with 30 or more tests for that period, 8.6 points below the 35.7% pooled across Missouri's counties, 6.3 points below the national pool of 33.4%. Of the city's other county, Christian County reported 43.5%.
Measured from the middle of Springfield, the nearest counties with a CDC figure for 2023 are Boone County (135 miles, 42.9% of 63 tests), Jackson County (138 miles, 44.1% of 204 tests) and Clay County (158 miles, 44.6% of 83 tests). Across the 6 nearest, the share at or above 4 pCi/L runs from 22.6% to 44.6%; the farthest of them, St. Louis County, is 185 miles away at 22.6%.
No business in the directory gives Springfield as its address; the Missouri list covers it. Missouri's other cities with a page of their own: Kansas City, Columbia and Lee's Summit.
Against Missouri and its other counties
Shares of tests people chose to run and report, by county (2023); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.
The counties around Springfield
By distance from the middle of Springfield; counties with 30 or more tests.
The median reported pre-mitigation result for 2023 was 2.9 pCi/L in Greene County and 2.7 pCi/L in Christian County.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.
Springfield, Geology
The ground under Springfield
PredictedUSGS's geologic map puts all of Springfield's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Springfield Plateau, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Springfield Plateau | Mississippian limestone, shale, and sandstone. | Moderate | 11 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Springfield beside its counties and Missouri
All of Springfield, like all of Greene County, is rated moderate. Across Missouri 8.2% of the land is rated high; none of Springfield's is.
The map rates the ground, not the air in any home.
Springfield, Homes
Homes in Springfield
Of Springfield's 83,980 homes, 61% are detached houses, against 71% across Greene County; 28% are in buildings of five or more homes. Half of its homes were built before 1976, close to Greene County's 1982: 28% date from before 1960 and 18% from 2000 or later. Most occupied homes here are rented: owners live in 43% (Greene County: 57%). A tenant can run a test; a fix is the landlord's to make.
| Homes | Springfield | Greene County | Missouri |
|---|---|---|---|
| Housing units | 83,980 | 137,930 | 2,809,501 |
| Detached houses | 61% | 71% | 70% |
| In buildings of 5 or more | 28% | 19% | 13% |
| Mobile homes | 2% | 3% | 5% |
| Built before 1960 | 28% | 21% | 28% |
| Built since 2000 | 18% | 25% | 21% |
| Middle year built | 1976 | 1982 | 1978 |
| Owner-occupied | 43% | 57% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Springfield, Local resources
Local resources for Springfield
Who to ask in Missouri: its radon program, test kits and professionals.
- Missouri Radon ProgramRun by Missouri Department of Health and Senior Services, phone 573-751-6102.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 MissouriRadon testers and mitigators in Missouri, each with how its listing was checked.
The program's own words on licensing are on the Missouri page.
What it means
Springfield, Questions
Questions about radon in Springfield
What radon zone is Springfield in?
Both counties Springfield reaches into (Greene County and Christian County) are in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L. EPA zones counties, not cities, so that is the zone for every part of Springfield.
What are radon levels in Springfield?
Around Springfield, 27.1% of 48 tests reported from Greene County for 2023 reached 4 pCi/L or more, so a high result is no surprise here. The median reported result was 2.9 pCi/L. Christian County reported 43.5% of 23 tests; the counties are kept apart.
Should I test my home in Springfield?
Yes. Greene County reported about 13 of its 48 tests at or above 4 pCi/L. That is below Missouri's pooled 35.7%, and still not a reason to skip it, and ranks Greene County 6th of the 7 Missouri counties with 30 or more tests. Which homes they were, no map can say. How to test a home.
What ground is Springfield built on, as far as radon goes?
USGS's geologic map puts all of Springfield on one named area, "Springfield Plateau", rated moderate for radon potential, radon index 11.
Is radon higher in the counties around Springfield?
It depends which way you go. 5 of the 6 nearest counties with a figure report a larger share than Greene County's 27.1% and 1 a smaller one: from St. Louis County (22.6%, 185 miles off) to Clay County (44.6%, 158 miles off).
The answers use the published figures of Greene County and Christian County, the counties Springfield lies in.
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