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Certified radon testers

Certified by the state to perform radon measurements, including for real estate transactions. 2534 listed so far.

430 locationsSource: state certification lists and the NRPP directory

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Virginia 54Denver, CO 37Indiana 30Colorado Springs, CO 27Indianapolis, IN 25Marion County, IN 25Pennsylvania 25Los Angeles County, CA 23Ohio 23Wisconsin 23Littleton, CO 22Montgomery County, PA 22Pittsburgh, PA 22Jefferson County, KY 21Louisville, KY 21Chester County, PA 21Texas 21New York 20Orange County, CA 19North Carolina 19Georgia 18Montgomery County, MD 18Allegheny County, PA 18Fairfax County, VA 18Kentucky 17Westmoreland County, PA 17Fort Collins, CO 16Minnesota 16Fayette County, KY 15Lexington, KY 15Providence County, RI 15Aurora, CO 14Broomfield County, CO 14Lakewood, CO 14Parker, CO 14Middlesex County, MA 14Raleigh, NC 14Illinois 13Kansas City, MO 13Saint Louis, MO 13St. Louis city, MO 13Utah County, UT 13Colorado 12Arvada, CO 12Castle Rock, CO 12Weld County, CO 12Iowa 12Wayne County, MI 12Oregon 12Luzerne County, PA 12Tennessee 12Prince William County, VA 12California 11El Paso County, CO 11Westminster, CO 11Fairfield County, CT 11Hartford County, CT 11New Haven County, CT 11Chicago, IL 11Hennepin County, MN 11Charlotte, NC 11Mecklenburg County, NC 11Bucks County, PA 11Florida 10Cook County, IL 10Carmel, IN 10Johnson County, KS 10Worcester County, MA 10Portland, OR 10Butler County, PA 10Monroe County, PA 10Dallas County, TX 10Waukesha County, WI 10West Virginia 10Jefferson County, AL 9Atlanta, GA 9Crown Point, IN 9Hendricks County, IN 9Kansas 9Essex County, MA 9Maryland 9Wake County, NC 9Reno, NV 9Maricopa County, AZ 8Ventura County, CA 8Boulder County, CO 8Centennial, CO 8Loveland, CO 8Thornton, CO 8DuPage County, IL 8Allen County, IN 8Fort Wayne, IN 8Baltimore city, MD 8Baltimore, MD 8Michigan 8Oakland County, MI 8Anoka County, MN 8Jackson County, MO 8New Jersey 8Erie County, NY 8Bexar County, TX 8Harris County, TX 8San Antonio, TX 8Roanoke City, VA 8Roanoke, VA 8Vermont 8Spokane, WA 8San Bernardino County, CA 7San Diego, CA 7Grand Junction, CO 7Mesa County, CO 7Lake County, IL 7Evansville, IN 7Hamilton County, IN 7Valparaiso, IN 7Vanderburgh County, IN 7Baltimore County, MD 7Minneapolis, MN 7Missouri 7Monmouth County, NJ 7Albuquerque, NM 7Bernalillo County, NM 7Oneida County, NY 7Cincinnati, OH 7Washington County, OR 7Delaware County, PA 7Lancaster County, PA 7Lehigh County, PA 7Northampton County, PA 7Philadelphia County, PA 7Philadelphia, PA 7York County, PA 7Knoxville, TN 7Salt Lake County, UT 7Chesterfield County, VA 7Fredericksburg, VA 7Alabama 6Placer County, CA 6Sacramento County, CA 6San Diego County, CA 6Broomfield, CO 6Durango, CO 6Highlands Ranch, CO 6Wheat Ridge, CO 6Cobb County, GA 6Ada County, ID 6Fishers, IN 6Lake County, IN 6Hillsborough County, NH 6Columbus, OH 6Clackamas County, OR 6Dauphin County, PA 6Washington County, PA 6Washington County, RI 6Greenville County, SC 6Loudoun County, VA 6Richmond, VA 6King County, WA 6Wyoming 6Alaska 5Phoenix, AZ 5Pima County, AZ 5Contra Costa County, CA 5Los Angeles, CA 5Oakland, CA 5Riverside County, CA 5San Jose, CA 5Santa Clara County, CA 5Adams County, CO 5Arapahoe County, CO 5Archuleta County, CO 5Breckenridge, CO 5Brighton, CO 5Eagle County, CO 5Eagle, CO 5Englewood, CO 5Golden, CO 5Larimer County, CO 5Pagosa Springs, CO 5Pueblo County, CO 5Tolland County, CT 5Broward County, FL 5Manatee County, FL 5Palm Beach County, FL 5Canton, GA 5Honolulu County, HI 5Idaho 5Kootenai County, ID 5Bartholomew County, IN 5Bloomington, IN 5Columbus, IN 5Monroe County, IN 5Sedgwick County, KS 5Wichita, KS 5Warren County, KY 5Massachusetts 5Ward Hill, MA 5Carroll County, MD 5Frederick County, MD 5Prince George's County, MD 5Maine 5Billings, MT 5Gallatin County, MT 5Durham County, NC 5Durham, NC 5Nebraska 5Bergen County, NJ 5Clark County, NV 5Washoe County, NV 5Broome County, NY 5Dutchess County, NY 5Monroe County, NY 5Darke County, OH 5Adams County, PA 5Berks County, PA 5Doylestown, PA 5Lackawanna County, PA 5Pike County, PA 5South Dakota 5Davidson County, TN 5Bedford County, VA 5Charlottesville, VA 5Herndon, VA 5Stafford County, VA 5Stafford, VA 5Berkeley County, WV 5Madison County, AL 4Coconino County, AZ 4Flagstaff, AZ 4Santa Barbara County, CA 4Jefferson County, CO 4Lake County, CO 4Longmont, CO 4Routt County, CO 4Steamboat Springs, CO 4New Castle County, DE 4Hillsborough County, FL 4Cherokee County, GA 4DeKalb County, GA 4Jackson County, GA 4Kane County, IL 4Will County, IL 4Clark County, IN 4Tippecanoe County, IN 4Bullitt County, KY 4Hardin County, KY 4Bristol County, MA 4Hampden County, MA 4Suffolk County, MA 4Howard County, MD 4Cumberland County, ME 4Ramsey County, MN 4St. Charles County, MO 4Buncombe County, NC 4Guilford County, NC 4Douglas County, NE 4Omaha, NE 4Rockingham County, NH 4Union County, NJ 4San Juan County, NM 4New York County, NY 4Ulster County, NY 4Franklin County, OH 4Oklahoma 4Beaver County, PA 4Cambria County, PA 4Cumberland County, PA 4Franklin County, PA 4Lycoming County, PA 4Schuylkill County, PA 4Rhode Island 4South Carolina 4Spartanburg County, SC 4Shelby County, TN 4Sullivan County, TN 4Denton County, TX 4Travis County, TX 4Utah 4Ashburn, VA 4Culpeper County, VA 4Frederick County, VA 4Henrico County, VA 4Lynchburg city, VA 4Lynchburg, VA 4Manassas City, VA 4Winchester city, VA 4Washington 4Jefferson County, WI 4Racine County, WI 4Greenbrier County, WV 4Limestone County, AL 3Pinal County, AZ 3Alameda County, CA 3Fresno County, CA 3Chaffee County, CO 3Douglas County, CO 3Gunnison County, CO 3La Plata County, CO 3Montrose County, CO 3Summit County, CO 3Teller County, CO 3Middlesex County, CT 3Duval County, FL 3Miami-Dade County, FL 3Orange County, FL 3Fulton County, GA 3Gwinnett County, GA 3Polk County, IA 3Boone County, IN 3Dearborn County, IN 3Elkhart County, IN 3Greenwood, IN 3Johnson County, IN 3LaPorte County, IN 3Madison County, IN 3Morgan County, IN 3St. Joseph County, IN 3Douglas County, KS 3Madison County, KY 3Oldham County, KY 3Norfolk County, MA 3Anne Arundel County, MD 3Harford County, MD 3Washington County, MD 3Berrien County, MI 3Jackson County, MI 3Livingston County, MI 3Macomb County, MI 3Monroe County, MI 3Stearns County, MN 3St. Louis County, MO 3Cascade County, MT 3Missoula County, MT 3Ravalli County, MT 3Cabarrus County, NC 3Forsyth County, NC 3Henderson County, NC 3Union County, NC 3Strafford County, NH 3Camden County, NJ 3Morris County, NJ 3Ocean County, NJ 3Nevada 3Albany County, NY 3Cortland County, NY 3Kings County, NY 3Onondaga County, NY 3Orange County, NY 3Queens County, NY 3Armstrong County, PA 3Blair County, PA 3Crawford County, PA 3Erie, PA 3Fayette County, PA 3Huntingdon County, PA 3Lebanon County, PA 3Wayne County, PA 3Bristol County, RI 3Anderson County, TN 3Montgomery County, TN 3Rutherford County, TN 3Washington County, TN 3Williamson County, TN 3Wilson County, TN 3Galveston County, TX 3Tarrant County, TX 3Sandy, UT 3Augusta County, VA 3Botetourt County, VA 3Fauquier County, VA 3Louisa County, VA 3Richmond city, VA 3Rockingham County, VA 3Spotsylvania County, VA 3Wythe County, VA 3Milwaukee County, WI 3Washington County, WI 3Raleigh County, WV 3Arkansas 2Washington County, AR 2Arizona 2El Dorado County, CA 2Fountain, CO 2Garfield County, CO 2Montezuma County, CO 2Connecticut 2Litchfield County, CT 2Delaware 2Bremer County, IA 2Winnebago County, IL 2Porter County, IN 2Wyandotte County, KS 2Kenton County, KY 2Louisiana 2Penobscot County, ME 2York County, ME 2Ingham County, MI 2Kent County, MI 2Otter Tail County, MN 2Iredell County, NC 2North Dakota 2Cass County, ND 2Grand Forks County, ND 2New Hampshire 2Manchester, NH 2Hudson County, NJ 2New Mexico 2Centre County, PA 2Cache County, UT 2Windsor County, VT 2Clark County, WA 2Spokane County, WA 2St. Croix County, WI 2Winnebago County, WI 2District of Columbia 1Lenawee County, MI 1Olmsted County, MN 1Mississippi 1Montana 1Yellowstone County, MT 1Merrimack County, NH 1Hamilton County, OH 1Erie County, PA 1Knox County, TN 1Weber County, UT 1Albemarle County, VA 1Fredericksburg city, VA 1La Crosse County, WI 1Walworth County, WI 1Laramie County, WY 1

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