This map of the State of Maryland if from the EPA website. It shows the layout of counties and the radon potentials associated with them.  Keep in mind that it is possible for high levels to be discovered in any area.  High levels of radon have been discovered in all areas but high incidences are more likely in some areas.



The yellow areas have a lower incidence of high radon levels.

The orange areas have a moderate incidence high radon levels.

The red areas have a higher incidence of high radon levels.

Below are some results of radon testing completed in Maryland.

Radon Test Results by County

-- readings 4.0 or above prompt a recommendation for mitigation --

 
       All homes should be tested for radon.
      Radon concentrations can vary significantly from house to house.

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Anne Arundel County

Annapolis – Harbor Dr. – 3.1 pCi/l

Annapolis – Mastline Dr. – 13.2 pCi/l  < mitigation recommended

Annapolis – Ritchie Ln. – 3.6 pCi/l

Annapolis – Tyler Ave. – 3.3 pCi/l

Annapolis – Wild Flower Glade – 1.0 pCi/l

Annapolis – Winslow Ct. – 1.0 pCi/l

Arnold – Buena Vista Ave. – 1.2 pCi/l

Arnold - Shore Acres Rd. - 0.6 pCi/l

Crofton – Bellow Ct. – 1.0 pCi/l

Crofton – Ellsworth Ave. – 2.3 pCi/l

Gibson Island – Banbury Rd. 1.4 pCi/l

Glen Burnie - Cresthaven Dr. 0.3 pCi/l

Jessup – Wye Ave. – 6.0 pCi/l  < mitigation recommended

Linthicum – Silky Oak Ct. – 1.5 pCi/l

Linthicum – West Maple Rd. – 5.1 pCi/l  < mitigation recommended

Millersville – Customs Way – 1.7 pCi/l

Millersville – Rustling Oaks Dr. – 1.4 pCi/l

Millersville – Stonestep Ct. - 2.9 pCi/l

Odenton – Canteen Cir. – 0.7 pCi/l

Pasadena – 10th St. – 20.5 pCi/l  < mitigation recommended

Pasadena – Belhaven Woods Ct. – 2.7 pCi/l

Pasadena - Milburn Cir. - 3.4 pCi/l

Pasadena - Sylvan Way - 2.1 pCi/l

Severn – Edelton Ave. – 2.2 pCi/l

Severn – Shelby Ct. – 2.2 pCi/l

Severna Park - Benfield Rd. - 8.5 pCi/l  < mitigation recommended

Severna Park – Benfield Rd. – 3.2 pCi/l

Severna Park – Kennedy Dr. – 2.3 pCi/l

Severna Park – Kinder Rd. – 2.0 pCi/l

Severna Park – Lower Magothy Beach Rd. – 2.6 pCi/l

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Baltimore County
 

Owings Mills – International Circle – 1.9 pCi/l

Parkville - Joppa Pond Rd. - 1.4 pCi/l

Parkville - Skywood Ct. - 24.3 pCi/l  < mitigation recommended

Parkville - White Spruce Ct. - 2.8 pCi/l

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Carroll County


Finksburg – Legacy Dr. – 7.4 pCi/l  < mitigation recommended

Sykesville – Jay Rd. – 7.8 pCi/l  < mitigation recommended

Sykesville – White Rock Rd. – 16.8 pCi/l  < mitigation recommended

Westminster - Charingworth Ct. - 3.7 pCi/l

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Harford County


Aberdeen - Harlan Ave. - 2.5 pCi/l

Abingdon - Bankert Terrace - 0.6 pCi/l 

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Howard County


Colombia – Carved Stone – 1.2 pCi/l

Elkridge – Ruxton Dr. – 0.9 pCi/l

Ellicott City – Arjay Cir. – 3.0 pCi/l

Ellicott City – Carillon Dr. – 9.9 pCi/l  < mitigation recommended

Ellicott City – Hollow Fields Ct. – 5.4 pCi/l  < mitigation recommended

Ellicott City – Kingscup Ct. – 0.4 pCi/l

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Montgomery County

Rockville – New Mark Esplande – 1.4 pCi/l

Silver Spring – Arbor View Rd. – 2.8 pCi/l

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Prince Georges County


Laurel – Hughes Ave. – 2.7 pCi/l

Laurel – Little River Rd. – 1.0 pCi/l