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

Avatar for 5 Microns Inc.
5 Microns Inc.
4.9(
74
)
Radon Gas - Testing

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"Pascal was the first one to call and kept in touch throughout the whole process. He was on time and professional yet personable. My husband was impressed with his knowledge and professionalism as well. We got the results within 2 business days. We would highly recommend Pascal to anyone needing mold testing services."
Vinyl sheeting asbestos test
Wall asbestos test
Asbestos air test
Mold and moisture testing
Mold air test

+32

Response time3 hrs
Response rate98%
Recommended by100%of homeowners
Palm Construction and Remodeling Inc.
4.2(
88
)
Radon Gas - AbatementRadon Gas - Testing

Serving Black Diamond, WA and surrounding areas

In business since 2020

Free estimates

Offers commercial services

"We hired Palm Construction to completely replaced our old roof and they did a fantastic job at very reasonable price. Lee and his crew were great to work with, they were quick, professional and they kept working area clean as possible. There were no any issues and roof replacement was finished in a timely manner. The quality and accuracy of their work is excellent and our new roof is awesome! Highly recommended contractor!!"
Response time2 days
Recommended by90%of homeowners
Avatar for Diversified Crawlspace Services
Diversified Crawlspace Services
3.6(
20
)
Radon Gas - Abatement

Serving Black Diamond, WA and surrounding areas

In business since 1992

Free estimates

Emergency services offered

"Diversified Crawl Space services helped us in our water drainage issues. Their crew was professional, on time, and well organized. They installed a crawl space drain system to take care of our wet crawl space. These guys also gave us the reasonable pricing. I would recommend Diversified to anyone looking to do water damage restoration related services over other pricey options."
moldy crawlspace
New access door
Rat slab
a moldy attic
After cleanup and mold treatment

+2

Response time7 hrs
Recommended by90%of homeowners
American Building Solution LLC
New to Angi
Radon Gas - AbatementRadon Gas - Testing

Serving Black Diamond, WA and surrounding areas

In business since 2014

Free estimates

Emergency services offered

Professional handyman services as well as Residential and Commercial property maintenance. \n \nWe specialize in room additions and full home remodels along with residential and commercial property electrical, plumbing, carpentry, and interior and exterior tenant improvements, re-keying, painting, landscaping, and all other property maintenance and construction services. \n \nProperty managers: we specialize in local handyman work and property maintenance needs. \n \nhttp://www.handymanintacoma.com/

 Kitchen, bath
 bathroom
 shower
Radon Detection and Reduction FAQs, answered by experts

No level of radon is technically safe, but since it is present everywhere, complete avoidance is impossible. The average radon level in homes across the United States is 1.3 picocuries per liter (pCi/L). The Environmental Protection Agency (EPA) recommends taking preventative measures if your home's radon levels are between 2 and 4 pCi/L or higher.

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

You can vent radon out of your house sometimes by simply opening a window, but it won’t remove the source, and will likely rise above recommended levels quickly. A professional will be needed to assess your home, and determine the best strategy for radon removal. Active radon sump pumps and soil depressurization systems are often used to forcefully vent the radon from your home.

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

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.

The Black Diamond, WA 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.