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Find Radon gas testers in Williamsport

Avatar for NextDay Inspect

NextDay Inspect

4.94(
316
)
Approved Pro

NextDay Inspect

4.94(
316
)
Approved Pro
Super Service Award
Customers say: True professional
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers
18 years of experience

Our goal is to protect our clients' interest by providing a thorough and detailed inspection of the property. With over 30,000 inspections completed, safeguarding our clients' investment is our priority. We provide residential home inspections, commercial building inspections, pre-drywall inspections, radon gas testing, and mold sampling. View the rate for your home inspection and scheduling availability on our website. Home Inspectors at NextDay Inspect are licensed by DPOR and DLLR and are certified members of ASHI, InterNACHI, and NRSB. Upon completing the on-site inspection the inspector will prepare a report, including photographs taken at the property, and arrows with commentary detailing the areas of concern. Specialized tools are used to ensure a thorough inspection of the properties components. Some of these tools are thermometer, moisture & humidity meter, thermal infrared camera, and outlet tester. We have an 'A+' rating with the Better Business Bureau.

"Michael was nothing but professional, friendly, thorough, and easy to talk with!"

Bryant L on December 2025

Our goal is to protect our clients' interest by providing a thorough and detailed inspection of the property. With over 30,000 inspections completed, safeguarding our clients' investment is our priority. We provide residential home inspections, commercial building inspections, pre-drywall inspections, radon gas testing, and mold sampling. View the rate for your home inspection and scheduling availability on our website. Home Inspectors at NextDay Inspect are licensed by DPOR and DLLR and are certified members of ASHI, InterNACHI, and NRSB. Upon completing the on-site inspection the inspector will prepare a report, including photographs taken at the property, and arrows with commentary detailing the areas of concern. Specialized tools are used to ensure a thorough inspection of the properties components. Some of these tools are thermometer, moisture & humidity meter, thermal infrared camera, and outlet tester. We have an 'A+' rating with the Better Business Bureau.

"Michael was nothing but professional, friendly, thorough, and easy to talk with!"

Bryant L on December 2025


Avatar for Environmental Testing & Research Laboratories, Inc

Environmental Testing & Research Laboratories, Inc

4.85(
347
)

Environmental Testing & Research Laboratories, Inc

4.85(
347
)
Customers say: True professional
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018


Avatar for Buyers Eyes Home Inspections LLC

Buyers Eyes Home Inspections LLC

5.00(
14
)

Buyers Eyes Home Inspections LLC

5.00(
14
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Buyers Eyes Home Inspections LLC is a locally owned and operated company that values honesty and integrity and will inspect your home as if we were buying it for ourselves. You will find us competitively priced. Licensed Home Inspector in Md. and Pa. Also Offering Radon Testing. Very detailed inspections with digital photos. Same day electronic reporting. I have been doing residential inspections for 35 years with a large insurance company so I am very experienced Now in business for myself. I am an electrician as well. **Also offering Radon Testing and Wood Destroying Insect Inspections. 301-676-7097

"Brett arrived on time and completed a detailed inspection of the interior and exterior. He also taught me about important aspects of home maintenance as he completed the assessment. The completed report was detailed and emailed to me very quickly."

Chris B on September 2021

Buyers Eyes Home Inspections LLC is a locally owned and operated company that values honesty and integrity and will inspect your home as if we were buying it for ourselves. You will find us competitively priced. Licensed Home Inspector in Md. and Pa. Also Offering Radon Testing. Very detailed inspections with digital photos. Same day electronic reporting. I have been doing residential inspections for 35 years with a large insurance company so I am very experienced Now in business for myself. I am an electrician as well. **Also offering Radon Testing and Wood Destroying Insect Inspections. 301-676-7097

"Brett arrived on time and completed a detailed inspection of the interior and exterior. He also taught me about important aspects of home maintenance as he completed the assessment. The completed report was detailed and emailed to me very quickly."

Chris B on September 2021


Avatar for RC Air & Mold Solutions

RC Air & Mold Solutions

5.00(
11
)

RC Air & Mold Solutions

5.00(
11
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

If you are concerned about the possibility you have mold in your home or see evidence of mold growth, contact us immediately! We have experienced Certified Mold Inspectors (CMI #81281) who will come in and do a complete inspection of your home or business. We are positioned to provide an assessment of the indoor air quality or environmental quality concern of private homes, commercial buildings and institutional complexes. If necessary, we will take air samples in the area of concern to determine the levels of contamination. If visible mold is present, we can do surface testing to determine the species of mold. Testing samples are sent to a non-affiliated leading environmental testing firm and test results are back after 48 hours.* After a review of laboratory results from samples taken while onsite and from our visual inspection, we can recommend and refer you to proper mold remediation companies that can correct the issue if deemed necessary. Your safety is our main concern and to the best of our ability, we will be there to help you have “The Safest Air You Can Breathe!” Your peace of mind is our best reward.

"Absolutely phenomenal Robert and Cindy are amazing to work with and make sure that the client is also educated which is extremely important in today’s modern age!"

Donald (DK) R on September 2023

If you are concerned about the possibility you have mold in your home or see evidence of mold growth, contact us immediately! We have experienced Certified Mold Inspectors (CMI #81281) who will come in and do a complete inspection of your home or business. We are positioned to provide an assessment of the indoor air quality or environmental quality concern of private homes, commercial buildings and institutional complexes. If necessary, we will take air samples in the area of concern to determine the levels of contamination. If visible mold is present, we can do surface testing to determine the species of mold. Testing samples are sent to a non-affiliated leading environmental testing firm and test results are back after 48 hours.* After a review of laboratory results from samples taken while onsite and from our visual inspection, we can recommend and refer you to proper mold remediation companies that can correct the issue if deemed necessary. Your safety is our main concern and to the best of our ability, we will be there to help you have “The Safest Air You Can Breathe!” Your peace of mind is our best reward.

"Absolutely phenomenal Robert and Cindy are amazing to work with and make sure that the client is also educated which is extremely important in today’s modern age!"

Donald (DK) R on September 2023


All About Waterproofing Inc

5.00(
16
)

All About Waterproofing Inc

5.00(
16
)
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

All About Waterproofing, Inc. is a family owned and operated, Maryland business that offers the highest quality work in the industry. We pay attention to every detail and provide you with the personal attention you and your home deserve. We offer free inspections and estimates performed by the most experienced professionals in the industry. We are dedicated to your satisfaction from your initial contact to the completion of your service. We stand behind all our work with our owners Satisfaction guaranteed. Additional address - 1114 Saddle View Way, Forest Hill MD 21050. Additional phone - (410) 836-8666.

All About Waterproofing, Inc. is a family owned and operated, Maryland business that offers the highest quality work in the industry. We pay attention to every detail and provide you with the personal attention you and your home deserve. We offer free inspections and estimates performed by the most experienced professionals in the industry. We are dedicated to your satisfaction from your initial contact to the completion of your service. We stand behind all our work with our owners Satisfaction guaranteed. Additional address - 1114 Saddle View Way, Forest Hill MD 21050. Additional phone - (410) 836-8666.


Avatar for '58 Foundations

'58 Foundations

4.25(
136
)

'58 Foundations

4.25(
136
)
Customers say: Super punctual
68 years of experience

For more than 60 years, ’58 Foundations & Waterproofing has provided the highest-quality basement waterproofing, crawlspace encapsulation, radon mitigation, mold removal and foundation repair solutions for homes and commercial properties. We lead with a promise of Trusted Five-Star Service, which means the customer experience is at the center of everything we do. Since 1958, we have been steadfast in keeping this promise and in upholding the values on which '58 Foundations was built: trust, teamwork, integrity, respect and communication. This comes across in all that we do: from the initial call to job completion, our customers are met with a knowledgeable, caring, and professional staff prepared to offer a five-star experience that is unmatched in the home repair industry.

"If you’re considering 58 Foundations, do yourself a favor and stop right now. I cannot, in good conscience, recommend this company to anyone—let alone friends or family. Their complete disregard for accountability is nothing short of infuriating. At first, things appeared to go smoothly. The workers were professional, and the workmanship seemed decent. But the illusion of competence quickly disintegrated when it came time for the building inspection. The city inspector requires a letter from the project engineer verifying that the work is safe, sound, and compliant with code. 58 Foundations flat-out refuses to provide this basic validation of their work. Why won’t they stand behind their project? Are they hiding shoddy, substandard work? As a homeowner, I’m now saddled with the mess of an open permit and no resolution in sight. This is unacceptable. If a company won’t back their work with a simple letter, what does that say about their integrity—or lack thereof? Didn't expect this kind of run around from a well established professional firm, save yourself the frustration and inevitable regret. Choose a company that honors their commitments and respects their customers. Once upon a time, 58 Foundations may have been reputable, but their crumbling standards are now painfully obvious. Don’t let their negligence become your problem."

Warrick S on December 2024

For more than 60 years, ’58 Foundations & Waterproofing has provided the highest-quality basement waterproofing, crawlspace encapsulation, radon mitigation, mold removal and foundation repair solutions for homes and commercial properties. We lead with a promise of Trusted Five-Star Service, which means the customer experience is at the center of everything we do. Since 1958, we have been steadfast in keeping this promise and in upholding the values on which '58 Foundations was built: trust, teamwork, integrity, respect and communication. This comes across in all that we do: from the initial call to job completion, our customers are met with a knowledgeable, caring, and professional staff prepared to offer a five-star experience that is unmatched in the home repair industry.

"If you’re considering 58 Foundations, do yourself a favor and stop right now. I cannot, in good conscience, recommend this company to anyone—let alone friends or family. Their complete disregard for accountability is nothing short of infuriating. At first, things appeared to go smoothly. The workers were professional, and the workmanship seemed decent. But the illusion of competence quickly disintegrated when it came time for the building inspection. The city inspector requires a letter from the project engineer verifying that the work is safe, sound, and compliant with code. 58 Foundations flat-out refuses to provide this basic validation of their work. Why won’t they stand behind their project? Are they hiding shoddy, substandard work? As a homeowner, I’m now saddled with the mess of an open permit and no resolution in sight. This is unacceptable. If a company won’t back their work with a simple letter, what does that say about their integrity—or lack thereof? Didn't expect this kind of run around from a well established professional firm, save yourself the frustration and inevitable regret. Choose a company that honors their commitments and respects their customers. Once upon a time, 58 Foundations may have been reputable, but their crumbling standards are now painfully obvious. Don’t let their negligence become your problem."

Warrick S on December 2024


"AdvantaClean installed a radon mitigation system at my house. Within two years, the piping they put in on the outside of the house to vent the gas collapsed. Upon further inspection, the ~30ft., ~50lb. pipe had been affixed upright by two plastic ties screwed to the siding, and the weight of the pipe had caused the screws to tear through the thin plastic on both ties. Similar systems I've looked at in the neighborhood use lighter, metal, gutter-like pipes, and metal ties (stronger ties for lighter pipes!). When contacted, Dave (the owner) tried to get me to pay $300 to fix it, claiming that he otherwise "couldn't help me" because I couldn't reasonably expect their work to last for almost two years. He also said any kind of warranty was void because "wind damage" wasn't covered. The winds in Frederick topped out at 8mph the day it fell, but I guess he's right. It honestly WOULD be unreasonable to expect this quality of work to hold up to normal weather events (normal storms and winds in a fairly mild weather part of the country) and wear for two whole years! I'm frankly surprised it didn't fall earlier. Oh, and it took me calling AdvantaClean three times to get ahold of him (thought I was promised a call back each time!), but that's way less egregious than the whole "doing sub-par work and trying to get me to pay for it when it failed" thing."

Sam G on August 2022

Specializing in emergency water damage mitigation, mold remediation, moisture control, Radon mitigation systems and air duct cleaning for residential, commercial and industrial customers.

"AdvantaClean installed a radon mitigation system at my house. Within two years, the piping they put in on the outside of the house to vent the gas collapsed. Upon further inspection, the ~30ft., ~50lb. pipe had been affixed upright by two plastic ties screwed to the siding, and the weight of the pipe had caused the screws to tear through the thin plastic on both ties. Similar systems I've looked at in the neighborhood use lighter, metal, gutter-like pipes, and metal ties (stronger ties for lighter pipes!). When contacted, Dave (the owner) tried to get me to pay $300 to fix it, claiming that he otherwise "couldn't help me" because I couldn't reasonably expect their work to last for almost two years. He also said any kind of warranty was void because "wind damage" wasn't covered. The winds in Frederick topped out at 8mph the day it fell, but I guess he's right. It honestly WOULD be unreasonable to expect this quality of work to hold up to normal weather events (normal storms and winds in a fairly mild weather part of the country) and wear for two whole years! I'm frankly surprised it didn't fall earlier. Oh, and it took me calling AdvantaClean three times to get ahold of him (thought I was promised a call back each time!), but that's way less egregious than the whole "doing sub-par work and trying to get me to pay for it when it failed" thing."

Sam G on August 2022



A.D.P. Inspections Inc.

4.43(
7
)

A.D.P. Inspections Inc.

4.43(
7
)
Customers say: Quick response
Free onsite estimate

We are a full service Home Inspection and Environmental Testing Services provider. Our Mission is to provide comprehensive inspection services, while educating our customers. Training and continuing education are essential to providing thorough and accurate services for our customers, and ensure that we have knowledge on the latest developments in our industry. We obtain this by exceeding the state and professional organizational training and certification requirements. We accept all major credit cards, checks and cash as payment forms.

We are a full service Home Inspection and Environmental Testing Services provider. Our Mission is to provide comprehensive inspection services, while educating our customers. Training and continuing education are essential to providing thorough and accurate services for our customers, and ensure that we have knowledge on the latest developments in our industry. We obtain this by exceeding the state and professional organizational training and certification requirements. We accept all major credit cards, checks and cash as payment forms.


Avatar for Ellingwood Pro

Ellingwood Pro

5.00(
1
)

Ellingwood Pro

5.00(
1
)
10 years of experience

Welcome to Ellingwood Pro LLC, your number one source for certified home inspections in Berkeley, Jefferson, Hampshire, Hardy, and Morgan County West Virginia, and Allegany, Washington, and Frederick County Maryland. We are dedicated to providing our customers with the best home inspection, with an emphasis on using non-invasive, visual examinations to identify defects within specific systems and components of residential properties. Free Estimates Found on https://ellingwoodpro.com/free-estimate Geremey Engle, U.S. veteran, and owner of Ellingwood Pro LLC have come a long way from its beginnings as a licensed residential remodeling company and we are happy to shift focus and have the opportunity to offer Residential Home Inspections, Residential Walk & Talk Inspections, Radon Inspection, Termite Inspection, Rental Property Safety, and Condition Inspections, Pre-Listing Inspections and Quality Control Contractor Inspections to the community. Our background in residential remodeling makes us unique compared to other home inspectors and businesses as many home inspectors have little to no experience in construction. Ellingwood Pro will discover defects, explain causes, and recommend the appropriate subject matter expert to remedy the issue and have you feeling confident to negotiate the purchase of your new home. We hope you enjoy our services as much as we enjoy offering them to you. If you have any questions, comments, or recommendations, please don't hesitate to contact us.

Welcome to Ellingwood Pro LLC, your number one source for certified home inspections in Berkeley, Jefferson, Hampshire, Hardy, and Morgan County West Virginia, and Allegany, Washington, and Frederick County Maryland. We are dedicated to providing our customers with the best home inspection, with an emphasis on using non-invasive, visual examinations to identify defects within specific systems and components of residential properties. Free Estimates Found on https://ellingwoodpro.com/free-estimate Geremey Engle, U.S. veteran, and owner of Ellingwood Pro LLC have come a long way from its beginnings as a licensed residential remodeling company and we are happy to shift focus and have the opportunity to offer Residential Home Inspections, Residential Walk & Talk Inspections, Radon Inspection, Termite Inspection, Rental Property Safety, and Condition Inspections, Pre-Listing Inspections and Quality Control Contractor Inspections to the community. Our background in residential remodeling makes us unique compared to other home inspectors and businesses as many home inspectors have little to no experience in construction. Ellingwood Pro will discover defects, explain causes, and recommend the appropriate subject matter expert to remedy the issue and have you feeling confident to negotiate the purchase of your new home. We hope you enjoy our services as much as we enjoy offering them to you. If you have any questions, comments, or recommendations, please don't hesitate to contact us.

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FAQs for radon gas testing projects in Williamsport, MD

Radon is the second leading cause of lung cancer in the U.S. The gas seeps through cracks in foundations and collects in basements and other low areas. Once you breathe it in, radioactive particles lodge in lung tissue and do long-term damage. Because you can’t see or smell radon, the EPA recommends testing your home every two years—and after major renovations—to keep your family safe.

Yes—every home should be tested. The EPA advises doing it at least every two years and any time you remodel, buy, or sell. On average, one in 15 houses nationwide sits above the recommended limit, and the only way to know where yours stands is a formal test. The equipment simply measures gas levels and won’t change your indoor environment, so the process is completely harmless.

Certified radon professionals—often home inspectors or dedicated radon mitigation contractors—handle testing. These radon testing professionals follow EPA protocols and use calibrated instruments to check levels throughout your house. Hiring a certified radon specialist means results you can trust for real estate deals, insurance requirements, and, most importantly, your family’s health.

Inspectors specialize in measuring radon gas levels, while licensed mitigation contractors design and install the systems that remove it. If your test comes back high, your inspector can point you to a qualified mitigation pro who will size and install the right fan, piping, or other equipment to bring levels down.

No—standard home air purifiers don’t touch radon. They’re built to trap dust and pollen, not radioactive gas. If testing shows high levels, you’ll need a dedicated mitigation system that vents the gas from beneath your home to the outdoors. Relying on a room purifier alone won’t keep your indoor air safe.

Opening a few windows in your home might dilute radon for a short time, but the gas seeps back in as soon as they’re closed. For a lasting fix, you’ll need a professional mitigation system—often a sub-slab depressurization fan—that pulls radon from beneath the foundation and safely vents it outside.

The Williamsport, MD homeowners’ guide to radon gas testings

From average costs to expert advice, get all the answers you need to get your job done.