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Radon Levels, Testing and Mitigation in Pennsylvania

Pennsylvania has 67 counties, with 49 classified as EPA Zone 1 (highest risk). With an average radon level of 9.53 pCi/L, Pennsylvania state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.

Pennsylvania is the 33rd most expansive state in terms of size and the 6th most populous. It also happens to be the 9th most densely populated state in the entire country.

Pennsylvania 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.

9.53
Avg. pCi/L
67
Counties
49
Zone 1 Counties

Pennsylvania Radon Map

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

Pennsylvania Metro Areas

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

Allentown Metro
5 cities
Chambersburg Metro
5 cities
Erie Metro
5 cities
Harrisburg Metro
5 cities
Lancaster Metro
5 cities
Philadelphia Metro
5 cities
Pittsburgh Metro
5 cities
Reading Metro
5 cities
Scranton Metro
5 cities
State College Metro
5 cities
York Metro
5 cities

Most Active Radon Markets in Pennsylvania

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

CityAvg User Radon LevelSubmissions
State College 10.00 pCi/L 14
Chambersburg 10.14 pCi/L 7
Easton 12.33 pCi/L 6
Butler 12.40 pCi/L 5
Dingmans Ferry 5.80 pCi/L 5
Hanover 14.00 pCi/L 4
Mechanicsburg 13.75 pCi/L 4
Greenville 10.75 pCi/L 4
Pittsburgh 9.25 pCi/L 4
Albrightsville 9.00 pCi/L 4
Philadelphia 8.00 pCi/L 4
Lackawaxen 15.33 pCi/L 3
York 11.67 pCi/L 3
Elizabethtown 9.67 pCi/L 3
Johnstown 7.33 pCi/L 3
West Chester 6.67 pCi/L 3
Danville 5.67 pCi/L 3
Springfield 5.67 pCi/L 3
East Stroudsburg 5.00 pCi/L 3
Langhorne 4.67 pCi/L 3

Pennsylvania Counties by EPA Radon Zone

All 67 Pennsylvania 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 49 counties
Adams County Zone 1
Avg: 11.0 pCi/L
Allegheny County Zone 1
Avg: 9.4 pCi/L
Armstrong County Zone 1
Avg: 13.5 pCi/L
Beaver County Zone 1
Avg: 13.0 pCi/L
Bedford County Zone 1
Avg: 20.0 pCi/L
Berks County Zone 1
Avg: 10.5 pCi/L
Blair County Zone 1
Avg: 7.4 pCi/L
Bradford County Zone 1
Avg: 7.8 pCi/L
Bucks County Zone 1
Avg: 9.0 pCi/L
Butler County Zone 1
Avg: 9.9 pCi/L
Cameron County Zone 1
Avg: 6.0 pCi/L
Carbon County Zone 1
Avg: 9.4 pCi/L
Centre County Zone 1
Avg: 9.8 pCi/L
Chester County Zone 1
Avg: 9.0 pCi/L
Clarion County Zone 1
Avg: 12.0 pCi/L
Clearfield County Zone 1
Avg: 13.8 pCi/L
Clinton County Zone 1
Avg: 4.5 pCi/L
Columbia County Zone 1
Avg:
Cumberland County Zone 1
Avg: 12.6 pCi/L
Dauphin County Zone 1
Avg: 13.0 pCi/L
Delaware County Zone 1
Avg: 5.4 pCi/L
Franklin County Zone 1
Avg: 8.5 pCi/L
Fulton County Zone 1
Avg: 8.0 pCi/L
Huntingdon County Zone 1
Avg: 20.0 pCi/L
Indiana County Zone 1
Avg: 10.7 pCi/L
Juniata County Zone 1
Avg:
Lackawanna County Zone 1
Avg: 12.0 pCi/L
Lancaster County Zone 1
Avg: 9.0 pCi/L
Lebanon County Zone 1
Avg: 9.5 pCi/L
Lehigh County Zone 1
Avg: 7.3 pCi/L
Luzerne County Zone 1
Avg: 6.8 pCi/L
Lycoming County Zone 1
Avg: 15.5 pCi/L
Mifflin County Zone 1
Avg:
Monroe County Zone 1
Avg: 8.5 pCi/L
Montgomery County Zone 1
Avg: 8.4 pCi/L
Montour County Zone 1
Avg: 5.7 pCi/L
Northampton County Zone 1
Avg: 13.6 pCi/L
Northumberland County Zone 1
Avg: 14.0 pCi/L
Perry County Zone 1
Avg:
Schuylkill County Zone 1
Avg: 15.0 pCi/L
Snyder County Zone 1
Avg: 8.3 pCi/L
Sullivan County Zone 1
Avg:
Susquehanna County Zone 1
Avg: 16.0 pCi/L
Tioga County Zone 1
Avg: 9.0 pCi/L
Union County Zone 1
Avg: 12.3 pCi/L
Venango County Zone 1
Avg: 1.0 pCi/L
Westmoreland County Zone 1
Avg: 7.5 pCi/L
Wyoming County Zone 1
Avg: 20.0 pCi/L
York County Zone 1
Avg: 12.7 pCi/L
Zone 2 — Moderate Risk
Predicted avg. indoor levels 2–4 pCi/L
Zone 2 17 counties
Cambria County Zone 2
Avg: 7.3 pCi/L
Crawford County Zone 2
Avg: 8.0 pCi/L
Elk County Zone 2
Avg:
Erie County Zone 2
Avg: 12.5 pCi/L
Fayette County Zone 2
Avg: 4.0 pCi/L
Forest County Zone 2
Avg:
Greene County Zone 2
Avg:
Jefferson County Zone 2
Avg: 7.5 pCi/L
Lawrence County Zone 2
Avg: 14.5 pCi/L
McKean County Zone 2
Avg: 5.5 pCi/L
Mercer County Zone 2
Avg: 8.1 pCi/L
Pike County Zone 2
Avg: 7.9 pCi/L
Potter County Zone 2
Avg: 10.8 pCi/L
Somerset County Zone 2
Avg: 9.0 pCi/L
Warren County Zone 2
Avg:
Washington County Zone 2
Avg: 7.8 pCi/L
Wayne County Zone 2
Avg: 6.0 pCi/L
Zone 3 — Low Risk
Predicted avg. indoor levels < 2 pCi/L
Zone 3 1 counties
Philadelphia County Zone 3
Avg: 8.0 pCi/L

Pennsylvania Cities & Towns

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

Aaronsburg Abbottstown Abington Acme Adah Adamsburg Adamsville Addison Adrian Airville Akron Alba Albion Albrightsville Alburtis Aleppo Alexandria Aliquippa Allensville Allentown Allenwood Allison Allison Park Allport Altoona Alum Bank Alverton Ambler Ambridge Amity Andreas Anita Annville Apollo Archbald Ardara Ardmore Armagh Artemas Ashland Ashville Aspers Aston Atglen Athens Atlantic Auburn Aultman Austin Avella Avondale Avonmore Baden Bainbridge Bakerstown Bala Cynwyd Bally Bangor Barnesville Barto Bartonsville Bath Beach Lake Bear Lake Beaver Beaver Falls Beaver Meadows Beaver Springs Beavertown Beccaria Bechtelsville Bedford Beech Creek Belle Vernon Bellefonte Belleville Bellwood Benezett Bensalem Bentleyville Benton Berlin Bernville Berwick Berwyn Bessemer Bethel Bethel Park Bethlehem Big Cove Tannery Biglerville Bird In Hand Birdsboro Blain Blairs Mills Blairsville Blakeslee Blandon Bloomsburg Blossburg Blue Bell Blue Ridge Summit Boalsburg Boiling Springs Bolivar Boswell Boyers Boyertown Brackenridge Brackney Braddock Bradenville Bradford Bradfordwoods Branchton Brandy Camp Brave Breezewood Breinigsville Bridgeport Bridgeville Bristol Broad Top Brockport Brockway Brodheadsville Brogue Brookhaven Brookville Broomall Brownsville Bryn Mawr Buena Vista Buffalo Mills Bulger Burgettstown Burnham Burnt Cabins Bushkill Butler Byrnedale Cabot Cairnbrook California Calvin Cambridge Springs Cammal Camp Hill Canadensis Canonsburg Canton Carbondale Carlisle Carlton Carmichaels Carnegie Carrolltown Carversville Cassville Catasauqua Catawissa Cecil Cedar Run Center Valley Centerville Central City Centre Hall Chadds Ford Chalfont Chambersburg Champion Charleroi Cheltenham Cherry Tree Cherryville Chester Chester Springs Cheswick Cheyney Chicora Christiana Clairton Clarence Clarendon Claridge Clarington Clarion Clarks Mills Clarks Summit Clarksburg Clarksville Claysburg Claysville Clearfield Clearville Clifton Heights Clinton Clymer Coal Center Coal Township Coaldale Coalport Coatesville Coburn Cochranton Cochranville Cocolamus Cogan Station Collegeville Colmar Columbia Columbia Cross Roads Columbus Colver Commodore Concord Conestoga Confluence Conneaut Lake Conneautville Connellsville Conshohocken Conway Cooksburg Coolspring Coopersburg Cooperstown Coplay Coraopolis Corry Corsica Coudersport Coupon Covington Cowanesque Cowansville Cranberry Cranberry Twp Cranesville Creekside Creighton Crescent Cresco Cresson Cressona Cross Fork Croydon Crum Lynne Crystal Spring Cuddy Curwensville Cyclone Daisytown Dallas Dallastown Dalmatia Dalton Damascus Danielsville Danville Darby Darlington Dauphin Davidsville Dawson Dayton De Young Delmont Delta Denver Derrick City Derry Devon Dilliner Dillsburg Dingmans Ferry Donegal Donora Dornsife Douglassville Dover Downingtown Doylesburg Doylestown Dravosburg Dresher Drexel Hill Driftwood Drumore Drums Dry Run Du Bois Dublin Duke Center Dunbar Duncannon Duncansville Duquesne Duryea Dushore Dysart East Berlin East Brady East Earl East Freedom East Greenville East Mc Keesport East Millsboro East Petersburg East Pittsburgh East Smithfield East Springfield East Stroudsburg East Waterford Easton Ebensburg Edinboro Edinburg Effort Eighty Four Eldred Elizabeth Elizabethtown Elizabethville Elkins Park Elkland Elliottsburg Ellwood City Elverson Elysburg Emlenton Emmaus Emporium Enola Enon Valley Entriken Ephrata Equinunk Erie Erwinna Essington Etters Evans City Everett Export Exton Factoryville Fairchance Fairfield Fairhope Fairless Hills Fairmount City Fairview Fallentimber Falls Falls Creek Fannettsburg Farmington Farrell Fawn Grove Fayette City Fayetteville Feasterville Trevose Felton Fenelton Finleyville Fishertown Fleetwood Flinton Flourtown Fogelsville Folcroft Folsom Fombell Ford City Ford Cliff Forest City Forksville Fort Hill Fort Littleton Fort Loudon Fort Washington Fountainville Frackville Franklin Frederick Fredericksburg Fredericktown Fredonia Freeburg Freedom Freeland Freeport Frenchville Friedens Friendsville Frostburg Fryburg Furlong Gaines Galeton Gallitzin Gap Garards Fort Gardners Garnet Valley Garrett Genesee Georgetown Germansville Gettysburg Gibbon Glade Gibsonia Gifford Gilbert Gilberton Gilbertsville Gillett Girard Girardville Gladwyne Glassport Glen Campbell Glen Lyon Glen Mills Glen Richey Glen Rock Glenmoore Glenolden Glenshaw Glenside Glenville Gordonville Gouldsboro Grampian Grand Valley Grantville Granville Granville Summit Grapeville Grassflat Gratz Graysville Great Bend Greeley Green Lane Greencastle Greensboro Greensburg Greentown Greenville Grindstone Grove City Guys Mills Gwynedd Hadley Halifax Hallstead Hamburg Hamilton Hamlin Haneyville Hanover Harborcreek Harford Harleysville Harmony Harrisburg Harrison City Harrison Valley Harrisonville Harrisville Hartstown Harveys Lake Harwick Hastings Hatboro Hatfield Haverford Havertown Hawk Run Hawley Hazleton Hegins Hellertown Henryville Hereford Herminie Hermitage Herndon Herrick Center Hershey Hesston Hickory Highspire Hiller Hilliards Hillsgrove Hilltown Holbrook Hollidaysburg Hollsopple Holmes Holtwood Home Homer City Homestead Honesdale Honey Brook Honey Grove Hookstown Hooversville Hop Bottom Hopewell Hopwood Horsham Houston Houtzdale Howard Hughesville Hummelstown Hunker Hunlock Creek Huntingdon Huntingdon Valley Huntington Mills Hustontown Hyde Park Hyndman Ickesburg Imler Imperial Indian Head Indiana Indianola Industry Irvine Irvona Irwin Jackson Jackson Center James Creek Jamestown Jamison Jeannette Jefferson Jenkintown Jenners Jermyn Jersey Shore Jessup Jim Thorpe Joffre Johnsonburg Johnstown Jones Mills Jonestown Josephine Julian Kane Kantner Karns City Karthaus Kempton Kennerdell Kennett Square Kersey King Of Prussia Kingsley Kingston Kintnersville Kinzers Kirkwood Kittanning Klingerstown Knox Knoxville Kossuth Kresgeville Kulpmont Kunkletown Kutztown La Belle La Jose Laceyville Lackawaxen Lafayette Hill Lairdsville Lake Ariel Lake City Lake Como Lake Lynn Lakeville Lakewood Lancaster Landenberg Landisburg Landisville Langhorne Lansdale Lansdowne Lansford Larimer Latrobe Laughlintown Laurys Station Lawrence Lawrenceville Lawton Le Raysville Lebanon Leck Kill Lecontes Mills Leechburg Leeper Leesport Leetsdale Lehighton Lemont Furnace Lemoyne Lenhartsville Lenoxville Leola Levittown Lewis Run Lewisberry Lewisburg Lewistown Liberty Lickingville Ligonier Lilly Lincoln University Linden Line Lexington Linesville Lititz Little Meadows Littlestown Liverpool Lock Haven Loganton Long Pond Lopez Loretto Loyalhanna Loysburg Loysville Lucinda Lumberville Lurgan Luthersburg Luzerne Lykens Lyndora Macungie Madera Madisonburg Mahaffey Mahanoy City Mainesburg Malvern Manchester Manheim Manns Choice Manor Mansfield Mapleton Depot Marble Marchand Marcus Hook Marianna Marienville Marietta Marion Center Markleton Markleysburg Mars Marsteller Martinsburg Marysville Masontown Matamoras Mayport Mc Alisterville Mc Clellandtown Mc Clure Mc Connellsburg Mc Donald Mc Kean Mc Kees Rocks Mc Sherrystown Mc Veytown Mcadoo Mckeesport Meadow Lands Meadville Mechanicsburg Mechanicsville Media Mehoopany Melcroft Mentcle Mercer Mercersburg Merion Station Mertztown Meshoppen Meyersdale Middleburg Middlebury Center Middletown Midland Mifflin Mifflinburg Mifflintown Milan Milanville Mildred Milford Mill Creek Mill Hall Mill Run Millersburg Millerstown Millersville Millerton Millheim Millmont Mills Millville Milroy Milton Mineral Point Minersville Mohnton Mohrsville Monaca Monessen Monongahela Monroeton Monroeville Mont Alto Mont Clare Montgomery Montgomeryville Montoursville Montrose Moosic Morgan Morgantown Morris Morrisdale Morrisville Morton Moscow Moshannon Mount Bethel Mount Carmel Mount Holly Springs Mount Jewett Mount Joy Mount Morris Mount Pleasant Mount Pleasant Mills Mount Pocono Mount Union Mount Wolf Mountain Top Mountville Muir Muncy Muncy Valley Munson Murrysville Myerstown Nanticoke Nanty Glo Narberth Narvon Natrona Heights Nazareth Needmore Neelyton Nescopeck Nesquehoning New Albany New Alexandria New Berlin New Bethlehem New Bloomfield New Brighton New Castle New Columbia New Cumberland New Derry New Eagle New Enterprise New Florence New Freedom New Freeport New Galilee New Holland New Hope New Kensington New Milford New Millport New Oxford New Paris New Park New Philadelphia New Providence New Ringgold New Salem New Stanton New Tripoli New Wilmington Newburg Newfoundland Newmanstown Newport Newtown Newtown Square Newville Nicholson Nicktown Normalville Norristown North Bend North East North Springfield North Versailles North Wales Northampton Northern Cambria Northpoint Northumberland Norwood Nottingham Noxen Nuremberg Oakdale Oakland Mills Oakmont Ohiopyle Oil City Olanta Old Forge Oley Oliveburg Olyphant Orangeville Orbisonia Orefield Oreland Orrstown Orrtanna Orviston Orwigsburg Osceola Osceola Mills Osterburg Ottsville Oxford Palm Palmerton Palmyra Paoli Paradise Parker Parkesburg Parkhill Patton Paupack Paxinos Peach Bottom Peach Glen Peckville Pen Argyl Penfield Penn Penn Run Pennsburg Pennsylvania Furnace Pequea Perkasie Perkiomenville Perryopolis Petersburg Petrolia Philadelphia Philipsburg Phoenixville Pine Grove Pipersville Pitcairn Pitman Pittsburgh Pittsfield Pittston Pleasant Hall Pleasant Mount Pleasantville Plymouth Plymouth Meeting Pocono Lake Pocono Pines Pocono Summit Point Marion Polk Port Allegany Port Carbon Port Matilda Port Royal Port Trevorton Portage Porters Sideling Portersville Pottersdale Pottstown Pottsville Presto Preston Park Prompton Prospect Prospect Park Prosperity Pulaski Punxsutawney Quakertown Quarryville Queen Ramey Reading Rebersburg Rebuck Rector Red Hill Red Lion Reeders Reedsville Reinholds Renfrew Renovo Rew Reynoldsville Rices Landing Riceville Richboro Richfield Richland Richlandtown Ridgway Ridley Park Riegelsville Rillton Rimersburg Ringgold Ringtown Rixford Roaring Branch Roaring Spring Robertsdale Robesonia Robinson Rochester Rochester Mills Rockton Rockwood Rogersville Rome Ronks Rossiter Roulette Royersford Ruffs Dale Rural Valley Russell Russellton Sabinsville Sacramento Saegertown Saint Benedict Saint Clair Saint Marys Saint Thomas Salisbury Salix Saltsburg Sandy Lake Sarver Saxonburg Saxton Saylorsburg Sayre Scenery Hill Schellsburg Schnecksville Schuylkill Haven Schwenksville Sciota Scotrun Scottdale Scranton Seanor Selinsgrove Sellersville Seminole Seneca Seven Valleys Seward Sewickley Shade Gap Shamokin Shamokin Dam Sharon Sharon Hill Sharpsville Shavertown Sheffield Shelocta Shenandoah Shermans Dale Shickshinny Shinglehouse Shippensburg Shippenville Shirleysburg Shoemakersville Shohola Shrewsbury Shunk Sidman Sigel Sinnamahoning Six Mile Run Slatington Slickville Sligo Slippery Rock Slovan Smethport Smicksburg Smithfield Smithmill Smithton Smock Smoketown Snow Shoe Snydersburg Somerset Souderton South Fork South Gibson South Park South Sterling Southampton Spangler Spartansburg Spraggs Sprankle Mills Spring Church Spring City Spring Creek Spring Glen Spring Grove Spring House Spring Mills Spring Run Springboro Springdale Springfield Springs Springville Sproul Spruce Creek Stahlstown Starford Starlight Starrucca State College Sterling Stevens Stevensville Stewartstown Stillwater Stoneboro Stoystown Strabane Strasburg Strattanville Strongstown Stroudsburg Sugar Grove Sugar Run Sugarloaf Summerhill Summerville Summit Hill Sunbury Susquehanna Sutersville Swarthmore Sweet Valley Swiftwater Sycamore Sykesville Tafton Tamaqua Tamiment Tannersville Tarentum Tarrs Taylor Telford Temple Templeton Terre Hill Thomasville Thompson Thompsontown Thorndale Thornton Three Springs Tidioute Timblin Tioga Tionesta Titusville Tobyhanna Todd Topton Toughkenamon Towanda Tower City Townville Trafford Transfer Tremont Trevorton Trexlertown Trout Run Troutville Troy Tunkhannock Turbotville Turtle Creek Turtlepoint Tyler Hill Tyrone Ulster Ulysses Union City Union Dale Uniontown Unityville University Park Upper Black Eddy Upper Darby Upperstrasburg Utica Valencia Valier Valley View Vanderbilt Vandergrift Venango Venetia Venus Verona Villanova Vintondale Volant Vowinckel Wallingford Walnut Bottom Walnutport Waltersburg Wampum Wapwallopen Warfordsburg Warminster Warren Warren Center Warrendale Warrington Warriors Mark Washington Washington Boro Washington Crossing Waterfall Waterford Waterville Watsontown Wattsburg Waymart Wayne Waynesboro Waynesburg Weatherly Weedville Wellersburg Wells Tannery Wellsboro Wellsville Wernersville West Alexander West Chester West Decatur West Finley West Grove West Middlesex West Mifflin West Milton West Newton West Salisbury West Springfield West Sunbury Westfield Westmoreland City Westover Westport Wexford White White Haven Whitehall Widnoon Wilburton Wilcox Wilkes Barre Williamsburg Williamsport Williamstown Willow Grove Willow Hill Willow Street Wilmerding Winburne Wind Gap Wind Ridge Windber Windsor Winfield Womelsdorf Woodbury Woodland Woodlyn Woodward Worthington Worthville Wrightsville Wyalusing Wyncote Wynnewood Wyoming Wysox Yeagertown York York Haven York Springs Youngsville Youngwood Yukon Zelienople Zieglerville Zion Grove Zionsville

Frequently Asked Questions About Radon in Pennsylvania

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 Pennsylvania?
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 Pennsylvania county in?
Pennsylvania 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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