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Radon Levels, Testing and Mitigation in Indiana

Indiana has 90 counties, with 56 classified as EPA Zone 1 (highest risk). With an average radon level of 7.66 pCi/L, Indiana state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.

Indiana is the 38th largest in terms of area, and is also the 16th most populous. The state maintains a commendable radon program, and they have plenty of information listed on the official site.

7.66
Avg. pCi/L
90
Counties
56
Zone 1 Counties

Indiana Radon Map

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

Indiana Metro Areas

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

Bloomington Metro
5 cities
Chicago Metro
5 cities
Cincinnati Metro
5 cities
Elkhart Metro
5 cities
Evansville Metro
5 cities
Fort Wayne Metro
5 cities
Indianapolis Metro
5 cities
Lafayette Metro
5 cities
Louisville Metro
5 cities
South Bend Metro
5 cities
Terre Haute Metro
5 cities

Most Active Radon Markets in Indiana

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

CityAvg User Radon LevelSubmissions
Bloomington 8.14 pCi/L 7
Kokomo 7.40 pCi/L 5
Lafayette 15.00 pCi/L 3
Valparaiso 10.00 pCi/L 3
Avon 6.00 pCi/L 3
West Lafayette 10.50 pCi/L 2
Dyer 9.50 pCi/L 2
Columbus 7.50 pCi/L 2
Noblesville 7.00 pCi/L 2
Westfield 7.00 pCi/L 2
Fishers 6.50 pCi/L 2
Corydon 6.00 pCi/L 2
Warsaw 5.50 pCi/L 2
Indianapolis 4.00 pCi/L 2
Newburgh 8.00 pCi/L 1
Logansport 7.00 pCi/L 1
Terre Haute 5.00 pCi/L 1
Muncie 4.00 pCi/L 1
Brownsburg No submissions 0

Indiana Counties by EPA Radon Zone

All 90 Indiana 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 56 counties
Adams County Zone 1
Avg: 6.0 pCi/L
Allen County Zone 1
Avg: 5.0 pCi/L
Bartholomew County Zone 1
Avg: 7.7 pCi/L
Benton County Zone 1
Avg:
Blackford County Zone 1
Avg: 5.0 pCi/L
Boone County Zone 1
Avg: 8.5 pCi/L
Carroll County Zone 1
Avg:
Cass County Zone 1
Avg: 7.0 pCi/L
Clark County Zone 1
Avg: 4.5 pCi/L
Clinton County Zone 1
Avg:
Decatur County Zone 1
Avg:
Delaware County Zone 1
Avg: 4.0 pCi/L
Elkhart County Zone 1
Avg: 3.0 pCi/L
Fayette County Zone 1
Avg:
Fountain County Zone 1
Avg: 14.0 pCi/L
Fulton County Zone 1
Avg: 16.0 pCi/L
Grant County Zone 1
Avg:
Hamilton County Zone 1
Avg: 6.4 pCi/L
Hancock County Zone 1
Avg: 6.0 pCi/L
Harrison County Zone 1
Avg: 4.3 pCi/L
Hendricks County Zone 1
Avg: 7.2 pCi/L
Henry County Zone 1
Avg:
Howard County Zone 1
Avg: 7.4 pCi/L
Huntington County Zone 1
Avg:
Jay County Zone 1
Avg:
Jennings County Zone 1
Avg:
Johnson County Zone 1
Avg: 6.0 pCi/L
Kosciusko County Zone 1
Avg: 5.3 pCi/L
LaGrange County Zone 1
Avg:
Lawrence County Zone 1
Avg:
Madison County Zone 1
Avg: 5.0 pCi/L
Marion County Zone 1
Avg: 6.8 pCi/L
Marshall County Zone 1
Avg:
Miami County Zone 1
Avg: 11.0 pCi/L
Monroe County Zone 1
Avg: 8.1 pCi/L
Montgomery County Zone 1
Avg: 5.7 pCi/L
Noble County Zone 1
Avg: 12.0 pCi/L
Orange County Zone 1
Avg:
Putnam County Zone 1
Avg: 7.0 pCi/L
Randolph County Zone 1
Avg:
Rush County Zone 1
Avg:
Scott County Zone 1
Avg:
Shelby County Zone 1
Avg: 20.0 pCi/L
St Joseph County Zone 1
Avg: 4.5 pCi/L
Steuben County Zone 1
Avg: 7.0 pCi/L
Tippecanoe County Zone 1
Avg: 13.2 pCi/L
Tipton County Zone 1
Avg:
Union County Zone 1
Avg:
Vermillion County Zone 1
Avg: 13.5 pCi/L
Wabash County Zone 1
Avg: 12.0 pCi/L
Warren County Zone 1
Avg:
Washington County Zone 1
Avg:
Wayne County Zone 1
Avg: 8.5 pCi/L
Wells County Zone 1
Avg: 4.0 pCi/L
White County Zone 1
Avg:
Whitley County Zone 1
Avg: 2.0 pCi/L
Zone 2 — Moderate Risk
Predicted avg. indoor levels 2–4 pCi/L
Zone 2 35 counties
Brown County Zone 2
Avg: 5.0 pCi/L
Clay County Zone 2
Avg:
Crawford County Zone 2
Avg: 10.0 pCi/L
Daviess County Zone 2
Avg: 7.0 pCi/L
Dearborn County Zone 2
Avg:
Dubois County Zone 2
Avg: 10.0 pCi/L
Floyd County Zone 2
Avg: 8.2 pCi/L
Franklin County Zone 2
Avg:
Gibson County Zone 2
Avg:
Greene County Zone 2
Avg:
Jackson County Zone 2
Avg:
Jasper County Zone 2
Avg:
Jefferson County Zone 2
Avg:
Knox County Zone 2
Avg:
La Porte County Zone 2
Avg: 15.0 pCi/L
Lake County Zone 2
Avg: 6.5 pCi/L
Martin County Zone 2
Avg:
Morgan County Zone 2
Avg: 10.0 pCi/L
Newton County Zone 2
Avg:
Ohio County Zone 2
Avg:
Owen County Zone 2
Avg:
Parke County Zone 2
Avg:
Perry County Zone 2
Avg:
Pike County Zone 2
Avg:
Porter County Zone 2
Avg: 8.3 pCi/L
Posey County Zone 2
Avg: 9.0 pCi/L
Pulaski County Zone 2
Avg: 10.0 pCi/L
Ripley County Zone 2
Avg: 3.0 pCi/L
Spencer County Zone 2
Avg:
Starke County Zone 2
Avg:
Sullivan County Zone 2
Avg:
Switzerland County Zone 2
Avg:
Vanderburgh County Zone 2
Avg: 4.0 pCi/L
Vigo County Zone 2
Avg: 5.0 pCi/L
Warrick County Zone 2
Avg: 8.0 pCi/L

Indiana Cities & Towns

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

Akron Albany Albion Alexandria Ambia Amboy Anderson Andrews Angola Arcadia Argos Arlington Ashley Atlanta Attica Auburn Aurora Austin Avilla Avon Bainbridge Bargersville Batesville Bath Battle Ground Bedford Beech Grove Bennington Berne Bethlehem Bicknell Birdseye Bloomfield Bloomingdale Bloomington Bluffton Boggstown Booneville Boonville Borden Boswell Bourbon Bowling Green Branchville Brazil Bremen Bringhurst Bristol Bristow Brook Brookston Brookville Brownsburg Brownstown Brownsville Bruceville Bryant Buckskin Bunker Hill Burket Burlington Burnettsville Butler Butlerville Cambridge City Camby Camden Campbellsburg Canaan Cannelburg Cannelton Carbon Carlisle Carmel Carthage Cayuga Cedar Grove Cedar Lake Celestine Centerpoint Centerville Central Chalmers Chandler Charlestown Charlottesville Chesterton Chrisney Churubusco Cicero Clarks Hill Clarksville Clay City Claypool Clayton Clinton Cloverdale Coal City Coatesville Colfax Columbia City Columbus Commiskey Connersville Converse Corunna Cory Corydon Covington Craigville Crandall Crane Crawfordsville Cromwell Cross Plains Crothersville Crown Point Culver Cutler Cynthiana Dale Daleville Dana Danville Darlington Decatur Decker Delphi Demotte Denver Depauw Deputy Derby Dillsboro Dubois Dugger Dunkirk Dupont Dyer Earl Park East Chicago Eaton Eckerty Economy Edinburgh Edwardsport Elberfeld Elizabeth Elizabethtown Elkhart Ellettsville Elnora Elwood English Etna Green Evanston Evansville Fair Oaks Fairbanks Fairland Fairmount Falmouth Farmersburg Farmland Ferdinand Fillmore Fishers Flat Rock Flora Florence Floyds Knobs Forest Fort Branch Fort Wayne Fortville Fountain City Fountaintown Fowler Francesville Francisco Frankfort Franklin Frankton Fredericksburg Freedom Freetown Fremont French Lick Galveston Garrett Gary Gas City Gaston Geneva Gentryville Georgetown Glenwood Goodland Goshen Gosport Grabill Grammer Grandview Granger Grantsburg Greencastle Greenfield Greens Fork Greensburg Greentown Greenville Greenwood Griffin Griffith Grissom Arb Grovertown Guilford Hagerstown Hamilton Hamlet Hammond Hanna Hanover Hardinsburg Harlan Hartford City Hartsville Haubstadt Hazleton Hebron Heltonville Henryville Highland Hillsboro Hillsdale Hoagland Hobart Holland Holton Homer Hope Howe Hudson Huntertown Huntingburg Huntington Idaville Indianapolis Ingalls Jamestown Jasonville Jasper Jeffersonville Jonesboro Kempton Kendallville Kentland Kewanna Keystone Kimmell Kingman Kirklin Knightstown Knox Kokomo Kouts La Crosse La Fontaine La Porte Laconia Ladoga Lafayette Lagrange Lagro Lake Station Lake Village Laketon Lakeville Lamar Lanesville Laotto Lapel Larwill Laurel Lawrenceburg Leavenworth Lebanon Leesburg Leo Leopold Lewis Lewisville Lexington Liberty Liberty Center Ligonier Lincoln City Linden Linton Lizton Logansport Loogootee Losantville Lowell Lucerne Lynn Lynnville Lyons Macy Madison Manilla Marengo Marion Markle Markleville Marshall Martinsville Marysville Mauckport Mc Cordsville Medaryville Medora Memphis Mentone Merom Merrillville Metamora Miami Michigan City Michigantown Middlebury Middletown Milan Milford Mill Creek Millersburg Milltown Milroy Milton Mishawaka Mitchell Modoc Monon Monroe Monroe City Monroeville Monrovia Monterey Montezuma Montgomery Monticello Montpelier Mooreland Moores Hill Mooresville Morgantown Morocco Morristown Mount Vernon Mulberry Muncie Munster Nabb Nappanee Nashville Needham New Albany New Carlisle New Castle New Harmony New Haven New Middletown New Palestine New Paris New Richmond New Ross New Salisbury New Washington New Waverly Newberry Newburgh Nineveh Noblesville Norman North Judson North Liberty North Manchester North Salem North Vernon North Webster Oakland City Oaktown Odon Oldenburg Oolitic Ora Orland Orleans Osceola Osgood Ossian Otisco Otterbein Otwell Owensburg Owensville Oxford Palmyra Paoli Paragon Paris Crossing Parker City Patoka Patriot Pekin Pendleton Pennville Perrysville Peru Petersburg Pierceton Pimento Pine Village Pittsboro Plainfield Plainville Pleasant Lake Plymouth Poland Poneto Portage Portland Poseyville Princeton Quincy Ragsdale Ramsey Redkey Reelsville Remington Rensselaer Reynolds Richland Richmond Ridgeville Rising Sun Roachdale Roann Roanoke Rochester Rockport Rockville Rolling Prairie Rome Rome City Romney Rosedale Rossville Royal Center Rushville Russellville Russiaville Saint Anthony Saint Croix Saint Joe Saint John Saint Meinrad Saint Paul Salamonia Salem San Pierre Sandborn Santa Claus Schererville Schnellville Scipio Scottsburg Sellersburg Selma Seymour Sharpsville Shelburn Shelbyville Sheridan Shipshewana Shirley Shoals Silver Lake Solsberry South Bend South Whitley Spencer Spencerville Spiceland Springport Springville Star City Stendal Stilesville Straughn Sullivan Sulphur Summitville Sunman Swayzee Switz City Syracuse Taswell Tell City Tennyson Terre Haute Thorntown Tippecanoe Tipton Topeka Trafalgar Troy Twelve Mile Underwood Union City Union Mills Uniondale Unionville Upland Urbana Vallonia Valparaiso Van Buren Veedersburg Velpen Versailles Vevay Vincennes Wabash Wadesville Wakarusa Waldron Walkerton Walton Wanatah Warren Warsaw Washington Waterloo Waveland Wawaka Waynetown Webster West Baden Springs West College Corner West Harrison West Lafayette West Lebanon West Terre Haute Westfield Westpoint Westport Westville Wheatfield Wheatland Whiteland Whitestown Whiting Wilkinson Williams Williamsburg Williamsport Winamac Winchester Windfall Wingate Winona Lake Winslow Wolcott Wolcottville Woodburn Worthington Yoder Yorktown Zionsville

Frequently Asked Questions About Radon in Indiana

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 Indiana?
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 Indiana county in?
Indiana 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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