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

Avatar for Safe Radon Solutions, LLC
Safe Radon Solutions, LLC
4.9(
32
)
Radon Gas - Abatement

Serving Portland, ME and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"Nick and Dori were wonderful to work with! They were kind and responsive and so, so thorough. Our radon levels were super high and they were able to install the mitigation system efficiently and professionally. I highly recommend them for mitigation, but also just for testing and any other questions even if you donâ t need mitigation. Overall, a wonderful experience. I wish no one had radon problems, but if you do, youâ re lucky to get to work with this company."
Response time1 day
Response rate86%
3 neighbors recently requested a quote
Aqua-Max of Maine
4.4(
105
)
Radon Gas - Abatement

Serving Portland, ME and surrounding areas

In business since 1994

Free estimates

Warranties offered

"The company's responsiveness to our urgent situation was extraordinary. The owner made a 60 mile trip to examine our situation on Sunday morning! He expected at least a week before they could do the work, but he got it done the next morning so that we would have safe water...we had been waiting for another contractor for more than 3 months! The installed radon mitigation system has performed flawlessly. We are grateful and confidently give AquaMax our highest recommendation."
Response time1 day
Recommended by96%of homeowners
Avatar for Rhino Radon Services
Rhino Radon Services
4.2(
9
)
Radon Gas - AbatementRadon Gas - Testing

Serving Portland, ME 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 Main Choice Inspections
Main Choice Inspections
5.0(
82
)
Radon Gas - AbatementRadon Gas - Testing

Serving Portland, ME and surrounding areas

In business since 2013

Free estimates

Emergency services offered

"Main Choice Inspections is the best inspection company out there. They are so thorough and their reports are very detailed. They really are a one-stop-shop and do everything including: sewer line scoping, well flow test, septic inspection, mold testing, water testing, air radon testing, and the list goes on. I wouldn't hire anyone else to inspect my home! Always quick to respond and answer any questions for myself and my clients. When you use MCI to inspect your home.... you have them for life! FIVE STARS!"
Recommended by92%of homeowners
Avatar for Indy Properties, LLC
Indy Properties, LLC
4.5(
6
)
Radon Gas - Testing

Serving Portland, ME and surrounding areas

In business since 2018

Free estimates

Indy Properties LLC is the solution to all of your home inspection needs. We take great pride in our extreme professionalism, timeliness, and superior customer service on every job. We make sure to develop a lasting relationship, so that the next time service is needed, there will be no question on who to call.

New wall mount propane boiler
New electrical panel
Response time20 mins
Response rate91%
Recommended by100%of homeowners
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Radon Detection and Reduction FAQs, answered by experts

The cost to replace a radon fan ranges from $300 to $600 for the fan itself, with installation adding an additional $200 to $500. Overall, the total cost for replacement can range from $500 to $1,100, depending on factors such as the fan model, home size, and local labor rates. If the fan is part of a larger radon mitigation system, the price may be higher.

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.

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.

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.

If high radon levels are detected, steps include sealing entry points, installing a mitigation system, and retesting the air regularly to ensure reduced levels.

The Portland, ME 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.