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Radon Levels, Testing and Mitigation in Missouri

Missouri has 108 counties, with 11 classified as EPA Zone 1 (highest risk). With an average radon level of 7.15 pCi/L, Missouri state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.

Missouri is the 21st most expansive state in terms of size and the 18th most populous in the entire US.

Missouri does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.

7.15
Avg. pCi/L
108
Counties
11
Zone 1 Counties

Missouri Radon Map

Missouri radon levels by county
Zone 1 — High
Zone 2 — Moderate
Zone 3 — Low

Missouri Metro Areas

Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.

Columbia Metro
5 cities
Jefferson City Metro
5 cities
Joplin Metro
5 cities
Kansas City Metro
5 cities
Springfield Metro
5 cities
St. Louis Metro
5 cities

Most Active Radon Markets in Missouri

Cities with the most user-submitted radon test data, ranked by number of submissions.

CityAvg User Radon LevelSubmissions
Troy 8.50 pCi/L 4
Lees Summit 7.00 pCi/L 3
Columbia 3.00 pCi/L 2
House Springs 7.00 pCi/L 1
Kansas City 7.00 pCi/L 1
Springfield 7.00 pCi/L 1
Independence 5.00 pCi/L 1
Wentzville No submissions 0

Missouri Counties by EPA Radon Zone

All 108 Missouri counties with their EPA radon zone classification and user-submitted average radon levels.

Zone 1 — High Risk
Predicted avg. indoor levels > 4.0 pCi/L
Zone 1 11 counties
Andrew County Zone 1
Avg:
Atchison County Zone 1
Avg: 5.0 pCi/L
Buchanan County Zone 1
Avg:
Cass County Zone 1
Avg: 14.0 pCi/L
Clay County Zone 1
Avg: 6.0 pCi/L
Clinton County Zone 1
Avg:
Holt County Zone 1
Avg:
Iron County Zone 1
Avg:
Jackson County Zone 1
Avg: 8.8 pCi/L
Nodaway County Zone 1
Avg:
Platte County Zone 1
Avg:
Zone 2 — Moderate Risk
Predicted avg. indoor levels 2–4 pCi/L
Zone 2 90 counties
Adair County Zone 2
Avg:
Audrain County Zone 2
Avg: 4.0 pCi/L
Barry County Zone 2
Avg: 4.3 pCi/L
Barton County Zone 2
Avg:
Bates County Zone 2
Avg:
Benton County Zone 2
Avg: 5.0 pCi/L
Bollinger County Zone 2
Avg:
Boone County Zone 2
Avg: 4.0 pCi/L
Caldwell County Zone 2
Avg:
Callaway County Zone 2
Avg: 4.0 pCi/L
Camden County Zone 2
Avg: 4.0 pCi/L
Cape Girardeau County Zone 2
Avg: 6.8 pCi/L
Carroll County Zone 2
Avg: 6.0 pCi/L
Carter County Zone 2
Avg: 3.0 pCi/L
Cedar County Zone 2
Avg: 4.0 pCi/L
Chariton County Zone 2
Avg:
Christian County Zone 2
Avg:
Clark County Zone 2
Avg:
Cole County Zone 2
Avg: 6.0 pCi/L
Cooper County Zone 2
Avg: 4.0 pCi/L
Crawford County Zone 2
Avg: 5.0 pCi/L
Dade County Zone 2
Avg:
Dallas County Zone 2
Avg:
Daviess County Zone 2
Avg:
DeKalb County Zone 2
Avg:
Dent County Zone 2
Avg: 6.0 pCi/L
Douglas County Zone 2
Avg:
Franklin County Zone 2
Avg: 7.3 pCi/L
Gasconade County Zone 2
Avg:
Gentry County Zone 2
Avg:
Greene County Zone 2
Avg: 7.0 pCi/L
Grundy County Zone 2
Avg:
Harrison County Zone 2
Avg:
Henry County Zone 2
Avg:
Hickory County Zone 2
Avg: 6.0 pCi/L
Howard County Zone 2
Avg:
Howell County Zone 2
Avg: 4.0 pCi/L
Jasper County Zone 2
Avg: 6.0 pCi/L
Jefferson County Zone 2
Avg: 8.9 pCi/L
Johnson County Zone 2
Avg: 9.0 pCi/L
Knox County Zone 2
Avg:
Laclede County Zone 2
Avg:
Lafayette County Zone 2
Avg:
Lawrence County Zone 2
Avg:
Lewis County Zone 2
Avg:
Lincoln County Zone 2
Avg: 8.5 pCi/L
Linn County Zone 2
Avg: 18.0 pCi/L
Livingston County Zone 2
Avg:
Macon County Zone 2
Avg:
Madison County Zone 2
Avg:
Maries County Zone 2
Avg:
Marion County Zone 2
Avg: 6.7 pCi/L
McDonald County Zone 2
Avg:
Mercer County Zone 2
Avg:
Miller County Zone 2
Avg:
Moniteau County Zone 2
Avg:
Monroe County Zone 2
Avg:
Montgomery County Zone 2
Avg:
Morgan County Zone 2
Avg: 7.0 pCi/L
Newton County Zone 2
Avg:
Oregon County Zone 2
Avg:
Osage County Zone 2
Avg:
Ozark County Zone 2
Avg:
Perry County Zone 2
Avg:
Pettis County Zone 2
Avg: 6.0 pCi/L
Phelps County Zone 2
Avg: 4.5 pCi/L
Pike County Zone 2
Avg:
Polk County Zone 2
Avg:
Pulaski County Zone 2
Avg: 7.0 pCi/L
Putnam County Zone 2
Avg:
Ralls County Zone 2
Avg:
Randolph County Zone 2
Avg:
Ray County Zone 2
Avg: 5.0 pCi/L
Reynolds County Zone 2
Avg:
Ripley County Zone 2
Avg:
Saline County Zone 2
Avg:
Schuyler County Zone 2
Avg:
Scotland County Zone 2
Avg:
Shannon County Zone 2
Avg:
Shelby County Zone 2
Avg:
St. Charles County Zone 2
Avg:
St. Clair County Zone 2
Avg:
St. Louis County Zone 2
Avg:
Stone County Zone 2
Avg: 6.6 pCi/L
Sullivan County Zone 2
Avg:
Taney County Zone 2
Avg: 4.0 pCi/L
Texas County Zone 2
Avg:
Wayne County Zone 2
Avg:
Webster County Zone 2
Avg: 7.0 pCi/L
Worth County Zone 2
Avg:
Zone 3 — Low Risk
Predicted avg. indoor levels < 2 pCi/L
Zone 3 7 counties
Butler County Zone 3
Avg:
Dunklin County Zone 3
Avg:
Mississippi County Zone 3
Avg:
New Madrid County Zone 3
Avg:
Pemiscot County Zone 3
Avg:
Scott County Zone 3
Avg:
Stoddard County Zone 3
Avg:

Missouri Cities & Towns

Browse radon data for individual cities across Missouri. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.

Adrian Advance Agency Albany Aldrich Alexandria Alma Altamont Altenburg Alton Amazonia Amity Amoret Amsterdam Anabel Anderson Annada Annapolis Appleton City Arbela Arbyrd Arcadia Archie Arcola Argyle Armstrong Arnold Asbury Ash Grove Ashburn Ashland Atlanta Augusta Aurora Auxvasse Ava Bakersfield Ballwin Baring Barnard Barnett Barnhart Bates City Beaufort Belgrade Bell City Belle Belleview Bellflower Belton Benton Benton City Berger Bernie Bertrand Bethany Bethel Beulah Bevier Billings Birch Tree Bismarck Bixby Black Blackburn Blackwater Blackwell Blairstown Bland Bloomfield Bloomsdale Blue Eye Blue Springs Blythedale Bogard Bois D Arc Bolckow Bolivar Bonne Terre Bonnots Mill Boonville Boss Bosworth Bourbon Bowling Green Bradleyville Bragg City Branson Brashear Braymer Breckenridge Briar Bridgeton Brighton Brinktown Brixey Bronaugh Brookfield Brookline Broseley Browning Brumley Bruner Brunswick Bucklin Buckner Bucyrus Buffalo Bunceton Bunker Burfordville Burlington Junction Butler Cabool Cadet Cainsville Cairo Caledonia Calhoun California Callao Camden Camden Point Camdenton Cameron Campbell Canton Cape Fair Cape Girardeau Cardwell Carl Junction Carrollton Carterville Carthage Caruthersville Cassville Catawissa Catron Caulfield Cedar Hill Cedarcreek Center Centertown Centerview Centerville Centralia Chadwick Chaffee Chamois Charleston Cherryville Chester Chesterfield Chestnutridge Chilhowee Chillicothe Chula Clarence Clark Clarksburg Clarksdale Clarksville Clarkton Clearmont Cleveland Clever Clifton Hill Climax Springs Clinton Clubb Clyde Coatsville Coffey Cole Camp Collins Columbia Conception Conception Junction Concordia Conway Cook Sta Corder Cosby Couch Cowgill Craig Crane Creighton Crocker Cross Timbers Crystal City Cuba Curryville Dadeville Daisy Dalton Darlington Davisville Dawn De Kalb De Soto De Witt Dearborn Deepwater Deerfield Defiance Denver Des Arc Devils Elbow Dexter Diamond Dittmer Dixon Doe Run Doniphan Dora Dover Downing Drexel Drury Dudley Duke Dunnegan Durham Eagle Rock Eagleville Earth City East Prairie Easton Edgar Springs Edgerton Edina Edwards El Dorado Springs Eldon Eldridge Elk Creek Elkland Ellington Ellsinore Elmer Elmo Elsberry Emden Eminence Eolia Essex Ethel Eugene Eunice Eureka Everton Ewing Excello Excelsior Springs Exeter Fair Grove Fair Play Fairdealing Fairfax Fairview Falcon Farber Farmington Faucett Fayette Fenton Festus Fillmore Fisk Flemington Fletcher Florence Florissant Foley Fordland Forest City Foristell Forsyth Fort Leonard Wood Fortuna Foster Frankford Franklin Fredericktown Freeburg Freeman Fremont French Village Friedheim Frohna Fulton Gainesville Galena Gallatin Galt Garden City Garrison Gatewood Gentry Gerald Gibbs Gideon Gilliam Gilman City Gipsy Glasgow Glenallen Glencoe Glenwood Gobler Golden Golden City Goodman Gorin Gower Graff Graham Grain Valley Granby Grandin Grandview Granger Grant City Gravois Mills Gray Summit Green Castle Green City Green Ridge Greenfield Greentop Greenville Greenwood Grover Grovespring Grubville Guilford Hale Half Way Hallsville Hamilton Hannibal Hardenville Hardin Harris Harrisburg Harrisonville Hartsburg Hartshorn Hartville Harviell Harwood Hatfield Hawk Point Hayti Hazelwood Helena Henley Henrietta Herculaneum Hermann Hermitage Higbee Higginsville High Hill High Ridge Highlandville Hillsboro Holcomb Holden Holliday Hollister Holt Holts Summit Hopkins Hornersville House Springs Houston Houstonia Huggins Hughesville Humansville Hume Humphreys Hunnewell Huntsville Hurdland Iberia Imperial Independence Ionia Irondale Ironton Isabella Jackson Jacksonville Jadwin Jameson Jamesport Jamestown Jasper Jefferson City Jerico Springs Jerome Jonesburg Joplin Kahoka Kaiser Kansas City Kearney Kennett Keytesville Kidder Kimberling City King City Kingdom City Kingston Kingsville Kirbyville Kirksville Kissee Mills Knob Noster Knox City Koeltztown Koshkonong La Belle La Grange La Monte La Plata La Russell Labadie Laclede Laddonia Lake Ozark Lake Saint Louis Lamar Lampe Lanagan Lancaster Laquey Laredo Latham Lathrop Lawson Leadwood Leasburg Lebanon Lees Summit Leeton Lenox Lentner Leonard Leopold Leslie Lesterville Lewistown Lexington Liberal Liberty Licking Lilbourn Lincoln Linn Linn Creek Linneus Livonia Lockwood Lodi Lohman Lone Jack Lonedell Long Lane Loose Creek Louisburg Louisiana Lowndes Lowry City Lucerne Ludlow Luebbering Luray Lynchburg Macks Creek Macomb Macon Madison Maitland Malden Malta Bend Mansfield Marble Hill Marceline Marionville Marquand Marshall Marshfield Marthasville Martinsburg Martinsville Maryland Heights Maryville Matthews Maysville Mayview Maywood Mc Clurg Mc Fall Mc Gee Meadville Memphis Mendon Mendota Mercer Meta Mexico Miami Middle Brook Middletown Milan Mill Spring Miller Millersville Milo Mindenmines Mineral Point Moberly Mokane Monett Monroe City Montgomery City Monticello Montreal Montrose Moody Mooresville Mora Morrison Morrisville Moscow Mills Mound City Moundville Mount Sterling Mount Vernon Mountain Grove Mountain View Myrtle Napoleon Naylor Neelyville Nelson Neosho Nevada New Bloomfield New Boston New Cambria New Florence New Franklin New Hampton New Haven New London New Madrid Newark Newburg Newtown Niangua Nixa Noble Noel Norborne Norwood Novelty Novinger O Fallon Oak Grove Oak Ridge Odessa Old Appleton Old Monroe Oldfield Olean Oran Oregon Oronogo Orrick Osage Beach Osborn Osceola Otterville Owensville Oxly Ozark Pacific Palmyra Paris Park Hills Parma Parnell Patterson Patton Pattonsburg Peace Valley Peculiar Perry Perryville Pevely Philadelphia Phillipsburg Pickering Piedmont Pierce City Pilot Grove Pineville Pittsburg Plato Platte City Plattsburg Pleasant Hill Pleasant Hope Plevna Polk Pollock Polo Pomona Ponce De Leon Pontiac Poplar Bluff Portage Des Sioux Portageville Portland Potosi Pottersville Powell Powersite Powersville Prairie Home Preston Princeton Protem Purdin Purdy Puxico Queen City Quincy Qulin Ravenwood Raymondville Raymore Rayville Rea Redford Reeds Reeds Spring Republic Revere Rhineland Rich Hill Richards Richland Richmond Richwoods Ridgedale Ridgeway Riverside Roach Robertsville Roby Rocheport Rock Port Rockaway Beach Rockville Rocky Comfort Rocky Mount Rogersville Rolla Rosebud Rosendale Rothville Rueter Rush Hill Rushville Russellville Rutledge Saint Ann Saint Charles Saint Clair Saint Elizabeth Saint James Saint Joseph Saint Louis Saint Mary Saint Peters Saint Robert Saint Thomas Sainte Genevieve Salem Salisbury Santa Fe Sarcoxie Savannah Schell City Scott City Sedalia Sedgewickville Seligman Senath Seneca Seymour Shelbina Shelbyville Sheldon Shell Knob Sheridan Shook Sibley Sikeston Silex Silva Skidmore Slater Smithton Smithville Solo South Fork South Greenfield South West City Sparta Spickard Spokane Springfield Squires Stanberry Stark City Steedman Steele Steelville Stella Stewartsville Stockton Stotts City Stoutland Stoutsville Stover Strafford Sturdivant Sturgeon Success Sullivan Summersville Sumner Sunrise Beach Sweet Springs Syracuse Taneyville Tarkio Taylor Tebbetts Tecumseh Thayer Theodosia Thompson Thornfield Tina Tipton Trenton Trimble Triplett Troy Truxton Tunas Turney Tuscumbia Udall Ulman Union Union Star Uniontown Unionville Urbana Urich Valles Mines Valley Park Van Buren Vandalia Vanzant Verona Versailles Viburnum Vichy Vienna Villa Ridge Vulcan Walker Walnut Grove Walnut Shade Wappapello Wardell Warrensburg Warrenton Warsaw Washburn Washington Wasola Watson Waverly Wayland Waynesville Weatherby Weaubleau Webb City Wellington Wellsville Wentworth Wentzville West Alton West Plains Westboro Weston Westphalia Wheatland Wheeling Whiteman Air Force Base Whitewater Willard Williamsburg Williamstown Williamsville Willow Springs Windsor Windyville Winfield Winigan Winona Winston Wooldridge Worth Worthington Wright City Wyaconda Yukon Zalma Zanoni

Frequently Asked Questions About Radon in Missouri

What radon level is considered "high"?
The EPA action level is 4.0 pCi/L — many homeowners also choose to fix levels between 2.0 and 4.0 pCi/L. Any home with levels at or above 4.0 pCi/L should be mitigated.
How much does radon mitigation cost in Missouri?
Radon mitigation typically costs between $800 and $2,500, depending on foundation type and radon severity. A standard sub-slab depressurization system usually falls in the $1,000–$1,500 range.
Does mitigation actually work?
Yes — properly installed systems typically reduce radon levels by up to 99%. A post-mitigation test confirms the system is working correctly, and many homeowners re-test periodically.
Should I test again after mitigation?
Yes. A post-mitigation test is the proof your system is working. The EPA recommends testing within 30 days of installation and retesting every two years.
What EPA Radon Zone is my Missouri county in?
Missouri counties are classified into three EPA Radon Zones. Zone 1 (highest risk, >4 pCi/L) indicates the most concern. Zone 2 (moderate, 2–4 pCi/L) and Zone 3 (lowest, <2 pCi/L) round out the classification. Use the county directory above to find your specific county's zone and data.

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