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Verified Reviews for Radon Detection And Reduction pros in Alton, NH

*The Angi rating for Radon Detection And Reduction companies in Alton, NH 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 Alton, NH 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 May 13, 2026

Top-Rated Radon detection and reduction specialists in Alton - Updated Nov 2026

Avatar for True North Home Inspections, LLC
True North Home Inspections, LLC
4.9(
27
)
Radon Gas - Testing

Serving Alton, NH and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"John was great, came to inspect our home in Rochester and was professional and had every piece of equipment you could need to give us a detailed look into our house. Even when the seller made a mistake on the sewer and water system types John helped us test both and went above and beyond. Cannot recommend enough if you want a the best and safest bet for an inspection!"
Response time3 hrs
Response rate89%
1 neighbors recently requested a quote
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Avatar for SWAT Environmental, Inc.
SWAT Environmental, Inc.
4.7(
13
)
Radon Gas - Abatement

Serving Alton, NH and surrounding areas

In business since 1988

Free estimates

Credit card accepted

"Highly recommend this team to help with Radon Mitigation. They were professional, easy to work with, and clearly experienced."
Response time6 hrs
Recommended by83%of homeowners
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Avatar for Absolute Water System LLC
Absolute Water System LLC
4.7(
30
)
Radon Gas - AbatementRadon Gas - Testing

Serving Alton, NH and surrounding areas

In business since 1981

Emergency services offered

Credit card accepted

"I think the total cost was around $2,500. I think the technical it is good, the good side, the bad side I think is the process between my first phone call and the last work was long."
Additional Photos
Additional Photos
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Recommended by96%of homeowners
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Avatar for Rhino Radon Services
Rhino Radon Services
4.2(
9
)
Radon Gas - AbatementRadon Gas - Testing

Serving Alton, NH and surrounding areas

In business since 2014

Free estimates

Emergency services offered

"He was on time, arrived at 9am as quoted and began to install the system. The system required two suction points and a sump pit cover. The sump pit originally had a pedestal pump in place and none of the other radon companies would change the pedestal pump to a submersible pump as required for the mitigation system to function properly. Rhino Radon not only changed the pump but installed a back flow check valve to ensure proper functioning of the system. All of the other companies said we would have to employ a plumber or a handy man to get this done. Had we gone that route the closing would not have happened. Rhino Radon gladly did all the work required and didn't even break for lunch!!! He was more concerned with getting us out of the vacant house seeing we are already down the cape. The system that involved a crawl space and being vented through the garage roof was completed immaculately and the test results came back at 0.5 pCil/L. This pleased the lender and buyer and exceeded our expectations. We highly recommend Rhino Radon Services.
"
Recommended by100%of homeowners
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Avatar for Pineland Home Inspections LLC
Pineland Home Inspections LLC
5.0(
3
)
Radon Gas - Testing

Serving Alton, NH and surrounding areas

In business since 2023

Free estimates

Small jobs welcome

"In the whole stressful home buying process he made the inspection the easiest, most stress-free part. Awesome!"
Front Steps
Main Water Line
Roof
Skylight
Bathroom Fan Vent

+3

Response time3 hrs
Response rate100%
Recommended by100%of homeowners
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Radon Detection and Reduction FAQs, answered by experts

Radon enters your home when warm air begins to rise and exits through the roof, creating a vacuum that pulls cooler air from under the foundation. Part of that air is radon, which is an invisible, odorless gas that develops naturally when radioactive particles are deep within the ground. Those particles usually come from decaying matter in soil and rocks.

Radon detection is crucial as prolonged exposure to radon gas, a leading cause of lung cancer, poses significant health risks in residential environments.

You'll need to test your home for radon after installing the mitigation system, then again every two years. If radon remains elevated, contact a licensed radon professional, either the contractor who installed the system or a different one, and have them evaluate the system. They may need to make some changes to improve its effectiveness and performance.

There are steps you can take as a homeowner to remediate radon yourself. While a radon reduction professional can make the biggest impact in your home, you can make efforts to improve radon levels on your own by sealing cracks, increasing ventilation, and testing for radon regularly.

While DIY testing is possible, abatement generally requires professional installation to ensure efficacy and meet safety standards.

The Alton, NH homeowners’ guide to radon detection and reduction services

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

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