Do I need a certified radon professional in Maryland?

For real estate transactions, most states require a certified radon tester. For mitigation, look for NRPP or AARST-NRPP certified mitigators. Maryland may have its own state certification program as well.

Find Radon Testers in Maryland

Q: How often should I test for radon in Maryland?

The EPA recommends testing every two years in Maryland, and any time you move into a new home or do major renovations. If you have a mitigation system, test every two years to ensure it is working.

Certified radon testing and mitigation professionals across Maryland. Browse 20+ listed providers below.

Radon Risk Level

EPA data for this state

Zone 1 — High

Average indoor level4.4 pCi/L

0EPA action level: 4 pCi/L10+

High radon potential; western MD counties especially elevated.

35% of homesin this state test above the EPA action level (4 pCi/L).

The EPA recommends all homes in high-radon states be tested regardless of construction type.

Browse by City in Maryland

Baltimore

13 providers

Gaithersburg

7 providers

Silver Spring

6 providers

Leonardtown

4 providers

Potomac

3 providers

Towson

3 providers

Germantown

3 providers

Lisbon

3 providers

Mount Airy

2 providers

Rockville

2 providers

Dundalk

2 providers

Abingdon

2 providers

Ellicott City

2 providers

Williamsport

2 providers

Bethesda

2 providers

Finksburg

2 providers

Elkton

2 providers

Laurel

2 providers

Reisterstown

2 providers

Westminster

2 providers

Flintstone

1 provider

Jefferson

1 provider

Keymar

1 provider

Lusby

1 provider

Marriottsville

1 provider

Brentwood

1 provider

Frederick

1 provider

Bowie

1 provider

Aberdeen

1 provider

Adamstown

1 provider

Arnold

1 provider

Boonsboro

1 provider

Cumberland

1 provider

Gwynn Oak

1 provider

Friendsville

1 provider

Huntingtown

1 provider

Landover

1 provider

Lothian

1 provider

Olney

1 provider

Sparks

1 provider

Sudlersville

1 provider

Annapolis

1 provider

Bel Air

1 provider

Catonsville

1 provider

Emmitsburg

1 provider

Clarksburg

1 provider

Keedysville

1 provider

Severn

1 provider

Columbia

1 provider

Nottingham

1 provider

Sykesville

1 provider

Radon Providers in Maryland(showing top 20)

VerifiedTester

ADAM GELLENDER

No reviews yet

Bowie, MD

Radon Testing

(516) 939-8226

VerifiedTester

ALAN BEAL

No reviews yet

Bethesda, MD

Radon Testing

(202) 607-4153

VerifiedTester

ALBERTO GUERRA

No reviews yet

Germantown, MD

Radon Testing

(240) 421-1580

VerifiedMitigator

ALEXANDER GUTMAN

No reviews yet

Reisterstown, MD

Mitigation

(877) 609-7977

VerifiedMitigator

ALEXANDER SHPILMAN

5.0(36)

Silver Spring, MD

Mitigation

(301) 660-0768

VerifiedTester

ALEXANDRA R. STIEFF

3.3(22)

Frederick, MD

Radon Testing

(301) 694-0011

VerifiedTester

ALI-REZA RIZWANI

4.0(4)

Rockville, MD

Radon Testing

(763) 744-8885

VerifiedTester

ANDREW MOWBRAY

No reviews yet

Leonardtown, MD

Radon Testing

(240) 808-0111

VerifiedTester

ANDREW WINNARD

3.7(3)

Marriottsville, MD

Radon Testing

(410) 236-3027

VerifiedMitigator

AVI KOTEK

4.7(1,090)

Silver Spring, MD

Mitigation

(301) 252-0057

VerifiedTester

BENJAMIN HU

4.4(15)

Gaithersburg, MD

Radon Testing

(301) 468-6666

VerifiedTester & Mitigator

BENJAMINS ZONIS

4.6(910)

Finksburg, MD

Radon TestingMitigation

(443) 850-6948

VerifiedTester

BRADLEY J. KIMBLE

No reviews yet

Flintstone, MD

Radon Testing

(301) 777-3899

VerifiedTester

BRIAN K MACIVER

No reviews yet

Baltimore, MD

Radon Testing

(410) 207-7364

VerifiedTester & Mitigator

CARL PUCCI

No reviews yet

Dundalk, MD

Radon TestingMitigation

(888) 584-8899

VerifiedTester

CARLOS M. AVERY

4.3(109)

Gaithersburg, MD

Radon Testing

(301) 468-6666

VerifiedTester

CHAMINDA JAYATILAKE

4.3(4)

Potomac, MD

Radon Testing

(301) 215-0163

VerifiedTester

CHRISTOPHER JOHNSON

4.5(13)

Abingdon, MD

Radon Testing

(410) 871-8618

VerifiedTester

CHRISTOPHER S WEBB

No reviews yet

Annapolis, MD

Radon Testing

(410) 940-9616

VerifiedTester

CHRISTOPHER W WILCOME

4.2(22)

Towson, MD

Radon Testing

(443) 900-7492

Radon Testing in Maryland — FAQ

How often should I test for radon in Maryland?

The EPA recommends testing every two years in Maryland. Always test when moving into a new home, after renovations that affect lower levels, and after installing a mitigation system.

What is the EPA action level for radon?

The EPA recommends taking action to reduce radon if indoor levels reach 4 pCi/L or higher. Even levels between 2–4 pCi/L present risk, and mitigation is recommended where feasible.

Do I need a certified radon tester in Maryland?

For real estate transactions, most states require a certified tester. Look for NRPP or AARST-NRPP certification. Maryland may also have its own state program — check your state radon office for specific requirements.