4.5 
23 *The Angi rating for Radon Detection And Reduction companies in Columbia, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.
*The HomeAdvisor rating for Radon Detection And Reduction companies in Columbia, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.
Last update on September 30, 2026
Serving Columbia, MD and surrounding areas
Approved
In business since 2000
Free estimates
Emergency services offered
"Great reduction in radon. 10.0+ prior to install, 1.4 after install!"
+2
Serving Columbia, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2008
Free estimates
Emergency services offered
"We needed to get a radon test. The process was very easy to get scheduled. They were very professional. We will definitely use them again for any other inspections."
+738
Serving Columbia, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2008
Free estimates
Emergency services offered
"Professional radon test and inspection performed by certified technician. Great customer service and reasonable price."
+378
Serving Columbia, MD and surrounding areas
Approved
In business since 1990
Free estimates
Customers say: Quick response
"I scheduled the radon testing with Bill. He was very thorough and accommodating. Bill agreed to meet my real estate agent at the property to set up the testing equipment. As promised, the test results were provided in a report format and after 48 hrs. Great service."
+4
Serving Columbia, MD and surrounding areas
Approved
In business since 1999
Free estimates
Customers say: Quick response
"Wonderful service from start to finish! They repeated a radon test and got quite a different reading than the building inspector who apparently did not place the canisters appropriately I thank Ted for saving us from the radon risk. Highly recommend and very professional"
Serving Columbia, MD and surrounding areas
Approved
In business since 2002
Free estimates
Emergency services offered
"Jerry provided excellent service for our air mold test. He was prompt in scheduling the appointment and arrived at the property as planned. After conducting the test, we received the results in just two days, which thankfully turned out negative."
Serving Columbia, MD and surrounding areas
Approved
Warranties offered
Credit card accepted
Customers say: True professional
Home inspection company that covers the house from top to bottom. Covering from the roof to the basement and / or crawl space. Nothing is left un turned. Also, specialize in radon, mold, and lead testing. Former Level II Thermaligist (infrared scanning). I can do it all. I am also certified through the Baltimore city and county to conduct rental inspection.
Serving Columbia, MD and surrounding areas
Approved
In business since 2013
Free estimates
Emergency services offered
Leading the industry by providing a comprehensive service to residential & commercial clients in need of selective & structural demolition , hazardous material abatement and disposal , as well as mold remediation services. Call or click for your FREE estimate today!\n
+9
Serving Columbia, MD and surrounding areas
Approved
In business since 2010
Free estimates
Credit card accepted
Hello my name is Jason William Hornung. Buying a home is a big investment. I want to help you make a well informed decision. I have been in the residential construction field for 17 years, and have an intimate knowledge of the homes in our area having done so much work in them myself. I stay continuously trained studying current information to give the best reports out there. I've seen many things that other inspectors have missed both as a home inspector and a contractor. My inspections meet or exceed the ASHI standards of practice. WWW.Homeinspector.org/standards WWW.JWHInspections.com
+3
Serving Columbia, MD and surrounding areas
Approved
In business since 2016
Free estimates
Warranties offered
At 911 Restoration by Germain Brothers LLC, we specialize in comprehensive disaster restoration services. Our team is dedicated to safeguarding homes and businesses from the damaging effects of mold, water, fires and storms. Here’s what sets us apart:\n\nMold Remediation: Our certified experts assess and isolate mold contamination, ensuring thorough removal and preventing further spore spread. We identify the root cause, devise effective solutions, and prioritize your safety.\nWater Removal and Storm Damage Restoration: When water wreaks havoc due to storms or other incidents, we’re here to help. Our 24/7 emergency response team swiftly tackles water extraction, drying, and structural repairs.\n\nComprehensive Services: Beyond mold and water remediation, we handle storm and fire damage repairs, as well as basement flood cleanup\nChoose 911 Restoration by Germain Brothers LLC for reliable, efficient, and compassionate restoration services. We’re committed to restoring peace of mind and protecting your property.
From average costs to expert advice, get all the answers you need to get your job done.
The cost of a radon mitigation system in Baltimore, MD, depends mostly on the type of system being installed. Use this guide to learn about your options.
The cost of a radon mitigation system in Washington, D.C., depends mostly on the type of system being installed. Use this guide to learn about your options.
Find out the average radon testing cost in Washington, D.C. Learn what you can expect to pay for local indoor air quality testing to keep your home safe.
Radon is a gas that you can't see or smell and is harmful to your health. If your home has radon, you need to know who installs radon mitigation systems.
What is radon testing? Radon testing measures the presence and concentration of radon gas within indoor environments. Read on to learn more.
Knowing how to test for radon will keep your home free and safe from this odorless gas—you just have to decide whether to do it yourself or hire a pro.
