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

Avatar for Quacker's Waterproofing & Basement Repair, LLC
Quacker's Waterproofing & Basement Repair, LLC
4.7(
167
)
Radon Gas - AbatementRadon Gas - Testing

Serving Festus, MO and surrounding areas

Approved

In business since 2001

Free estimates

Warranties offered

"This company was terrific. The owner, Jason, was very patient, friendly, and thorough during the quoting process, and the company did exactly what he promised in the time promised. Their method of dealing with bowed walls is different from those the other companies quoted me, and was half the price. And it also meant they didn't have to dig up my yard and jackhammer my concrete porch. I did a lot of research because I was worried that it really was "too good to be true." But all the various videos, articles, etc, I found supported that this method works, and the physics of it made sense to me as well. And with the lifetime warranty, along with how accommodating Jason was throughout the entire process, I feel confident that if there does happen to be a problem later down the road, Quackers will make it right. I suppose if they don't, I'll come back to update this review, but so far so good."
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+1

5 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Scope Environmental
Scope Environmental
5.0(
15
)
Radon Gas - Testing

Serving Festus, MO and surrounding areas

In business since 2023

Free estimates

Small jobs welcome

"I used Scope Environmental recently to test floor tile and the underlying mastic to determine if either contained asbestos. I selected Scope because Jeff was very responsive, professional, independent of the abatement companies and his price was competitive. Jeff suggested testing both the tiles and mastic. The tiles tested positive for asbestos but the mastic contained no asbestos. As a result, I saved considerable expense by abating the tiles only and not the mastic so I also used Scope again for the post abatement air testing rather than the abatement company. I would hire Scope again for material and air testing for asbestos, mold or any other potentially toxic materials."
Black mold inside closet
Mold growth in HVAC Closet
Asbestos Flooring
Floor sample collection
Asbestos Adhesive

+10

Response time4 hrs
Response rate96%
Recommended by73%of homeowners
Avatar for Proper Environmental
Proper Environmental
5.0(
6
)
Radon Gas - AbatementRadon Gas - Testing

Serving Festus, MO and surrounding areas

Free estimates

Credit card accepted

"It went great! They set up a system in my parent's house and they mitigated the radon down to a save level. They did a test before and after, and I was satisfied with the results. Proper Environmental did a thorough job and would recommend this company to anyone!"
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+3

Recommended by100%of homeowners
Avatar for Golden Leaf Veterans
Golden Leaf Veterans
New to Angi
Radon Gas - Testing

Serving Festus, MO and surrounding areas

In business since 2012

Free estimates

Emergency services offered

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade, and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

Inspected by Goldleaf Veterans = Sold
Response time4 hrs
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Radon Detection and Reduction FAQs, answered by experts

Use a radon test kit or hire professionals to conduct a detailed assessment of radon levels in your home.

Installation typically takes 1-2 days, depending on the system and property layout.

Keeping radon from getting into your home is much better than having to get rid of it once it's already indoors. While there may not be a way to fully prevent radon from getting into your home, there are things you can do to reduce the gas's ability to enter. 

Sealing foundation cracks and openings can help keep the gas from seeping inside. Improving air flow, such as by opening windows, can also be helpful. If you're building your home from scratch, talk to your contractor about using radon-resistant construction to keep the gas out.

A homeowner can install a radon mitigation system on their own. But it’s a challenging DIY that requires a lot of knowledge about radon mitigation as well as familiarity with local regulations. You do not want to risk an improper installation that leaves the system unable to detect radon or gives it a shortened life span. Relying on a professional is the surest way to guarantee a successful installation.

Mitigation can take several days depending on home setup, equipment accessibility, and achieving effective diffusion system sealed efficiency.

The Festus, MO 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.