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

Avatar for Airtight Radon Solutions LLC
Airtight Radon Solutions LLC
5.0(
30
)
Radon Gas - AbatementRadon Gas - Testing

Serving Greenville, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Offers commercial services

"Marcel performed a flawless installation of a Radon Mitigation system in my home. He thoroughly explained and shared testing results as he proceeded with the installation. He continually checked and rechecked his measurements and cuts making sure everything was level and plumb. I'm a very meticulous customer and I was completely satisfied with my new system. He left an instrument to monitor my radon levels for a few days just to be absolutely sure that everything is performing as it should be. If you need Radon Mitigation...I HIGHLY recommend Airtight Radon Solutions."
My Projects
Radon Mitigation Ranch
Response time6 hrs
Response rate98%
30 neighbors recently requested a quote
Avatar for True North Home Inspections, LLC
True North Home Inspections, LLC
4.9(
27
)
Radon Gas - Testing

Serving Greenville, 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
Avatar for Erickson Foundation Solutions
Erickson Foundation Solutions
4.1(
75
)
Radon Gas - AbatementRadon Gas - Testing

Serving Greenville, NH and surrounding areas

Approved

In business since 1979

Free estimates

Emergency services offered

"I hired Erickson Foundation for radon mitigation. Job went smoothly. They communicated well, were very professional, and reviewed all potential options for the job with me. The system installation was done on time, professionally done, and well cleaned-up. The equipment is high quality, with the 10-year warranty being a big plus."
Sinking Step Repair
Settling Home Addition
Settling Slab
EZ Posts for deck addition
Foundation Crack Repair

+60

Response time1 day
9 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Absolute Water System LLC
Absolute Water System LLC
4.7(
30
)
Radon Gas - AbatementRadon Gas - Testing

Serving Greenville, NH and surrounding areas

In business since 1981

Emergency services offered

Credit card accepted

"George and his team were extremely friendly and professional. This is a good group of people. Courteous and thoughtful, they were able to do a complete installation of both systems from scratch in about 6 hours.
The new radon remediation system (Bubble Up) has the added benefit of boosting the fixture pressure in the house to city level or better (60-75psi) as well as completely resolving the pH level of the water.
The cost was slightly lower than the other two quotes we received, partially due to the fact that Absolute offered a "multi-system" discount since two systems were going in at the same time.
If in your service area, I would highly recommend George Doumit of Absolute Water System.
"
Additional Photos
Additional Photos
Additional Photos
Recommended by96%of homeowners
Avatar for Rhino Radon Services
Rhino Radon Services
4.2(
9
)
Radon Gas - AbatementRadon Gas - Testing

Serving Greenville, 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
Avatar for Pineland Home Inspections LLC
Pineland Home Inspections LLC
5.0(
3
)
Radon Gas - Testing

Serving Greenville, NH and surrounding areas

In business since 2023

Free estimates

Small jobs welcome

At Pineland Home Inspections, we take pride in our work and always put you, the customer, first. We focus on spending as much time as necessary answering questions and educating you about one of the largest investment in your life, your home. Our aim is to make your life easier through the use of cutting edge technology and first hand experience all with a down to earth personal touch. Our inspectors are licensed, fully insured and available on weekends to fit your busy schedule.

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

Many radon fans carry a five-year manufacturer's warranty. That said, your radon fan should last between five and ten years. Regular inspections will ensure the fan is operating properly. Unusual or exceptional noise coming from the fan or indications on your manometer or system monitor can immediately tell you that something is amiss.

Testing every 2-5 years or upon adjusting occupancy or structural changes maintains safe environments.

The soil beneath your house is most likely what’s causing an increased level of radon. This is because soil holds radioactivity for a long time and it’s also what most buildings are built on. Another common source of radon is water from a source that hasn’t been through periodic radon tests, such as well water. Over time, the radon from the soil can inhabit other parts of your house like the foundation or plumbing.

Options include sub-slab depressurization, crawlspace ventilation, and sealing cracks. Choose based on home construction and radon levels.

The cost for a radon mitigation system typically ranges from $800 to $1,500, with an average around $1,000. The final price depends on several factors, including the size of your home, the severity of the radon issue, and the type of system required. Your home's foundation type also significantly impacts the cost. For example, sealing and ventilating an unfinished basement might cost around $4,600, while encapsulating a crawl space without a foundation slab can range from $1,500 to $15,000.

The Greenville, 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.