THE 10 BEST Radon Mitigation Services in PORTLAND, OR
| Business Name | Key Services | Best For | Address | Hours | PS Rating |
|---|---|---|---|---|---|
| Cascade Radon | Radon testing, mitigation, system design, new construction | Experienced professionals with 30+ years | 12839 NE Airport Way, Portland, OR 97230 | Mon-Thu 8am-5pm, Fri 8am-4:30pm | 4.8/5 |
| Just Radon | Radon testing, mitigation, new construction systems | Premium systems with double lifetime warranty | 4911 SE Aldercrest Rd, Portland, OR 97222 | By Appointment | 4.7/5 |
| Environmental Works | Radon testing, mitigation, commercial services, new construction | WHO level guarantees (2.7 pCi/L) | 22820 NE Sandy Blvd, Fairview, OR 97024 | Mon-Fri 8am-5pm | 4.6/5 |
| Radon Testing and Mitigation PNW | Radon testing, mitigation systems, crawlspace sealing | Licensed and certified professionals | Portland, OR 97233 | Mon-Fri 8am-7pm, Sat 8am-5pm, Sun 10am-5pm | 4.5/5 |
| Alpha Environmental Services | Radon testing, mitigation, environmental consulting | Comprehensive environmental services | 11080 SW Allen Blvd #100, Beaverton, OR 97005 | Mon-Fri 8am-5pm | 4.4/5 |
| John’s Waterproofing | Radon testing, mitigation, waterproofing services | Multifamily and HUD compliance | 219 Airport Road, Silverton, OR 97381 | Mon-Fri Business Hours | 4.5/5 |
| TerraFirma Foundation Systems | Radon mitigation, foundation repair, waterproofing | Foundation and radon combined solutions | 13110 SW Wall St, Portland, OR 97223 | Mon-Fri 8am-5pm | 4.3/5 |
| Soil Solutions | Radon testing, mitigation, environmental services | Professional and organized service | 3540 SE 28th Ave, Portland, OR 97202 | Mon-Fri 7:30am-5:30pm | 4.6/5 |
| Absolute Environment | Radon mitigation, environmental testing | Affordable pricing with quality work | Portland Metro Area | By Appointment | 4.5/5 |
| SWAT Environmental | Radon testing, mitigation, removal systems | Fast professional service | Portland Service Area | Mon-Fri Business Hours | 4.4/5 |
#1. Cascade Radon – Best for Experienced Professionals with 30+ Years
Key Highlights:
- EPA certified for over 30 years with extensive experience in the Pacific Northwest
- Continuous monitoring from start to finish ensuring radon levels stay below EPA action levels
- Serves residential, commercial, multi-family, schools, and public buildings across Oregon, Washington, and Idaho
Cascade Radon stands as the Pacific Northwest’s most experienced radon testing and mitigation company. With more than three decades of EPA certification, they have built their reputation on knowledge and proven results. Their team uses state-of-the-art diagnostic techniques including continuous electronic radon monitors to provide quick and accurate testing.
What makes Cascade Radon special is their commitment to monitoring projects throughout the entire process. They don’t consider a job done until radon levels are safely below the EPA Action Level. The company was originally founded as Steve Tucker Design in 2001 and changed its name in 2008 to better reflect their specialized focus.
They work with all types of properties, from single-family homes to large commercial buildings and schools. Their services include both short-term and long-term testing, detailed written reports with recommendations, and professional mitigation system installation. All work follows EPA protocols, giving customers peace of mind that they’re getting the highest standard of service.
Cascade Radon’s expertise extends to consulting and system design for new construction projects. They understand that preventing radon problems during the building phase is more cost-effective than fixing them later. Their location in Northeast Portland makes them easily accessible to customers throughout the metro area.
#2. Just Radon – Best for Premium Systems with Double Lifetime Warranty
Key Highlights:
- Industry-best double lifetime system warranty that transfers to next homeowner
- Guarantees radon reduction to as low as 0.5 pCi/L, far below EPA standards
- Uses only American-made fans with 10-year warranties and Schedule 40 PVC piping for maximum durability
Just Radon lives up to its name by specializing exclusively in radon services. They don’t do home inspections, sewer scopes, or other general contracting work. This focused approach allows them to perfect their craft and deliver exceptional results. Their unique installation method involves removing up to 15 gallons of dirt from underneath the slab, creating a large suction pit that gives radon gas a place to collect.
The company sets itself apart with warranties that go beyond industry standards. While most companies offer 5-year warranties, Just Radon provides a double lifetime guarantee that protects both you and the next owner of your home. Their systems are designed to last for decades, not just years.
Quality materials are a priority for Just Radon. They use the strongest Schedule 40 PVC or ABS piping instead of the cheaper thin-wall options many competitors choose. Their high-efficiency radon fans are made in America and come with sound dampeners at every connection point to keep noise levels low. The company also uses advanced FLIR thermal scanning technology to find hidden cracks under carpets in finished basements.
Testing services are available with state-of-the-art Corentium Pro continuous radon monitors that provide accurate measurements. Just Radon offers 24/7 online scheduling for rush measurement requests at no extra charge. They serve Portland and surrounding areas including Lake Oswego.
#3. Environmental Works – Best for WHO Level Guarantees (2.7 pCi/L)
Key Highlights:
- Only Portland company guaranteeing radon reduction below WHO limit of 2.7 pCi/L
- AARST-NRPP certified with thousands of successful mitigation projects since 2009
- Free continuing education classes for realtors and community members about radon safety
Environmental Works goes above and beyond standard EPA requirements. While most companies aim for the EPA action level of 4.0 pCi/L, Environmental Works guarantees their systems will reduce radon to below the World Health Organization’s stricter limit of 2.7 pCi/L. This commitment to excellence has made them the number one environmental services company in the Portland Metro Area.
The company takes a customized approach to each property. They conduct pressure extension testing to confirm the best suction point locations and engineer systems that effectively remove radon without being an eyesore. Their technicians consider everything from cold joints between foundation walls to unsealed sump pumps when designing a solution.
Environmental Works offers same-day services and immediate radon test results when using their Sun Radon hourly continuous monitors. They specialize in working with multi-family housing, conducting large-scale testing projects efficiently using electronic data collection systems. Property managers, realtors, and housing authorities throughout Portland trust them for accurate results and professional service.
For new construction, they provide passive radon systems backed by a fully transferable 10-year guarantee. If the passive system needs to be made active later, they install the fan for free. Their experienced team has backgrounds in both commercial and residential construction, giving them unique insight into proper system design and installation.
#4. Radon Testing and Mitigation PNW – Best for Licensed and Certified Professionals
Key Highlights:
- All staff are radon-certified professionals with thorough training
- Licensed, insured, and bonded with proper permits pulled for all work
- Offers 30-year guarantee to bring radon levels below EPA recommended level of 4.0 pCi/L
Radon Testing and Mitigation PNW emphasizes doing things the right way. In Oregon where radon contractor certification is not required by law, many companies take shortcuts. This company stands apart by employing only certified professionals and pulling proper trade permits for mechanical and electrical work. They have licensed electricians handle all electrical components, ensuring safe and code-compliant installations.
The company provides transparent information about what makes quality radon mitigation. They explain that their prices reflect the higher standards they maintain, from using long-lasting fans to proper permitting. Their success rate with radon mitigation is 100 percent, and they back their work with a comprehensive warranty.
Their testing and mitigation techniques are efficient and thorough. For basement systems, they drill into the foundation and install piping that connects to an exterior fan. Crawlspace systems require additional vapor barrier sealing, which they handle professionally. Most single-family home installations can be completed in one day once the radon source is identified.
Free retesting is provided after installation to confirm the system is working properly. They recommend retesting between 24 hours and 30 days after the fan starts operating. The company serves the entire Portland metro area with extended hours including evenings and weekends.
#5. Alpha Environmental Services – Best for Comprehensive Environmental Services
Key Highlights:
- Over 20 years serving the greater Portland area with full environmental consulting
- Services include radon, mold, asbestos, lead testing, and underground tank work
- Provides 5-year warranty on radon systems with flexible financing options available
Alpha Environmental Services offers a one-stop solution for all environmental concerns. While radon is a core service, they also handle mold removal, asbestos abatement, underground oil tanks, and Phase I and II environmental site assessments. This comprehensive approach means customers can address multiple property issues with a single trusted company.
The company’s radon services include both testing and mitigation for residential and commercial properties. They use equipment that’s significantly more accurate than DIY testing kits. Their certified technicians are trained to properly install radon mitigation systems that comply with local building codes and prevent radon from re-entering the building.
Customer service is a top priority at Alpha Environmental. Real estate agents frequently use their services and praise their responsive scheduling department and professional staff. The company provides detailed photo documentation during inspections and thorough explanations of all findings. Same-day appointments are often available, making them ideal for time-sensitive real estate transactions.
Portland has some of the highest radon risk levels in Oregon, particularly in neighborhoods like Alameda Ridge, Piedmont, and Montavilla. Alpha Environmental helps homeowners and business owners in these areas test their properties and install effective mitigation systems. Their location in Beaverton serves the entire Portland metro area.
#6. John’s Waterproofing – Best for Multifamily and HUD Compliance
Key Highlights:
- Member of National Radon Defense network with nearly 40 years in business
- Specializes in HUD multifamily radon testing and mitigation compliance
- Offers payment plans and financing to make radon mitigation affordable for all homeowners
John’s Waterproofing brings decades of experience to radon mitigation. As part of the National Radon Defense network, their technicians receive extensive training on best practices for installing radon mitigation systems. They understand how to pull radon from within homes and expel it safely outside.
The company excels at multifamily property radon work. They understand HUD requirements and can handle the complex needs of apartment buildings, condos, and townhouses. Testing all units in large buildings requires special equipment and expertise, which John’s Waterproofing provides efficiently. Their systems are designed to work with complex HVAC and ventilation systems found in multi-unit buildings.
Free in-home consultations are available where specialists conduct structural analysis and design surveys. They explain all the details of successful mitigation before starting work. The company uses continuous radon monitors that provide reliable results within 48 hours, making them ideal for real estate transactions.
Their services extend throughout Oregon and Washington, including Portland, Vancouver, Salem, Eugene, Beaverton, and surrounding areas. They offer variety of payment options because they understand radon mitigation is not always a budgeted expense. The company works with customers to ensure they get the best value within their price range.
#7. TerraFirma Foundation Systems – Best for Foundation and Radon Combined Solutions
Key Highlights:
- Experts in both foundation repair and radon mitigation since 2005
- Serves all of Oregon and Western Washington with multiple office locations
- Can address foundation issues and radon problems simultaneously for comprehensive solutions
TerraFirma Foundation Systems offers a unique advantage for homeowners dealing with both foundation and radon issues. Since foundation problems can create pathways for radon entry, having one company handle both concerns ensures a coordinated solution. They have over 20 years of experience keeping homes safe, dry, and stable throughout the Pacific Northwest.
Nearly half of TerraFirma’s business comes from referrals or repeat customers, demonstrating their commitment to quality work. They understand Portland’s unique soil composition, which combines clay and silt with heavy rainfall to create perfect conditions for foundation settling and radon infiltration. Their solutions address these regional challenges specifically.
The company provides energy recovery ventilators as an alternative radon mitigation method for homes where traditional active soil depressurization isn’t practical. These systems remove stale air and radon while bringing in fresh outdoor air without wasting energy. This approach works well for homes with inaccessible crawl spaces or HVAC returns under the slab.
TerraFirma offers free estimates and operates Monday through Friday from their Portland location on SW Wall Street. They also maintain offices in Roseburg, Tacoma, and Vancouver, allowing them to serve customers throughout the region. Their warranties give customers confidence that solutions will last long-term.
#8. Soil Solutions – Best for Professional and Organized Service
Key Highlights:
- NRPP-certified radon measurement and mitigation technicians
- Excellent customer service with quick scheduling and thorough communication
- Provides detailed video documentation and digital invoicing for convenient service
Soil Solutions has built a strong reputation for professional, organized service delivery. Customers consistently praise their responsive scheduling, with one contact point Kayla noted for being pleasant and helpful. The company can often schedule services within the same week of initial contact, making them ideal for time-sensitive situations.
Their radon technicians are certified by the National Radon Proficiency Program to provide accurate professional measurements and design effective mitigation systems. They understand that many areas of Oregon and southwest Washington have high naturally occurring radon levels due to local geology. Their expertise helps protect families from this invisible health threat.
The company’s attention to detail extends beyond the technical work. They provide thorough video documentation of inspections, send materials electronically for quick review, and offer convenient online payment options. This streamlined process makes the entire experience smooth and efficient for customers.
Soil Solutions offers a full range of environmental services beyond radon, including oil tank decommissioning and sewer scoping. Their location on SE 28th Avenue in Portland is easily accessible. Operating hours Monday through Friday from 7:30 AM to 5:30 PM accommodate most schedules. Customers appreciate that the company maintains relationships long after initial service, even providing courtesy repairs when unexpected damage occurs.
#9. Absolute Environment – Best for Affordable Pricing with Quality Work
Key Highlights:
- Provides quotes significantly lower than many competitors without sacrificing quality
- Experienced professional who completes installations efficiently
- Uses high-quality materials and achieves excellent radon reduction results
Absolute Environment stands out for offering exceptional value without compromising on quality. One satisfied customer reported receiving quotes from other local companies reaching five figures for the same work, while Absolute Environment completed the job for a third of the cost. Despite the affordable pricing, they use high-quality materials and achieve excellent results.
Mike, the owner, is described as a super nice guy who is very experienced, straightforward, and honest. He completes radon mitigation installations in one day and reduces radon levels to proper safe amounts. His approach combines technical expertise with genuine care for customer satisfaction.
The company serves the Portland metro area by appointment, allowing for flexible scheduling that works around customer needs. This personalized approach means customers work directly with experienced professionals rather than being passed through multiple departments. The straightforward communication style helps homeowners understand their radon situation and the solutions being implemented.
For homeowners worried about the cost of radon mitigation, Absolute Environment demonstrates that quality service doesn’t have to break the bank. They prove that choosing a smaller, focused company can provide excellent results at reasonable prices.
#10. SWAT Environmental – Best for Fast Professional Service
Key Highlights:
- Specializes in engineering effective radon removal systems
- Provides free, no-obligation price quotes for Portland area residents
- Guarantees results and 100% satisfaction on all mitigation work
SWAT Environmental brings engineering expertise to radon mitigation throughout the Portland area. They understand the science behind radon entry into homes and design systems that effectively address the problem. Their radon removal systems create negative pressure in the soil beneath foundations, drawing radon upward through connected piping instead of allowing it to enter living spaces.
The company serves Portland and surrounding communities with professional mitigation services. They recognize that Portland is designated as a radon gas Zone 2 by the EPA, with average radon levels of 3.0 pCi/L or higher. This means many Portland homes are at risk for elevated radon levels, making testing and mitigation important for family health.
SWAT Environmental provides free price quotes so homeowners can make informed decisions without financial pressure. They guarantee both results and customer satisfaction on all mitigation work. Their approach combines technical proficiency with customer service excellence.
The mitigation process typically involves drilling into the foundation, installing PVC piping, and connecting to an exterior fan that continuously draws radon from the soil. SWAT Environmental handles this process efficiently, often completing installations quickly so families can return to safe indoor air quality. Their commitment to protecting families from radon exposure has made them a trusted name in Portland environmental services.
How Much Does Radon Mitigation Cost in Portland?
Radon mitigation costs in Portland typically range from $1,500 to $2,500 for most homes. The average cost is around $1,200 to $2,000 for a standard basement or slab foundation system. Several factors affect the final price of your radon mitigation system.
The size of your home plays a big role in determining cost. Larger homes may require multiple suction points or more extensive piping, which increases the price. The type of foundation you have also matters. Basement systems are usually straightforward, while crawlspace systems cost more because they require vapor barrier sealing in addition to the fan and piping.
The complexity of your home’s layout affects pricing too. Homes with finished basements, multiple levels, or difficult access to the foundation area may need more labor and creative solutions. Some companies charge extra for homes that require interior pipe routing through living spaces versus exterior installation.
New construction radon systems are less expensive than retrofit installations. If you’re building a new home, installing a passive radon system during construction costs much less than adding a system later. Many companies offer passive systems that can be upgraded to active systems if needed after the home is built.
Quality matters when choosing a radon mitigation company. Companies using certified professionals, proper permits, high-quality fans, and durable materials may charge more than those taking shortcuts. However, a well-installed system will last longer and work better, saving you money over time. Most reputable companies offer free estimates, so you can compare prices and services before making a decision.
How Long Does Radon Mitigation Take in Portland Homes?
Most radon mitigation system installations in Portland homes take one to two days to complete. For a typical single-family home with a basement or slab foundation, professional installers can usually finish the job in one day. The process moves quickly once the radon source is identified and the system design is finalized.
The installation begins with drilling a hole through your foundation slab or into the crawlspace floor. Installers then remove soil from beneath the foundation to create a suction point where radon gas can collect. Next, they install PVC piping that connects the suction point to a radon fan mounted on the exterior of your home.
The piping routes through your home or along the outside wall, depending on your home’s design and your preferences. Installers seal all connections carefully and make sure the system exhausts above the roofline where radon gas can safely disperse. Electrical work connects the fan to a power source, and installers test the system to ensure it’s working properly.
Crawlspace systems may take slightly longer than basement systems. The crawlspace needs a vapor barrier installed and sealed around all exposed earth before the piping and fan installation. This extra step adds time but is essential for effective radon reduction in homes with crawlspaces.
More complex homes with multiple foundation types, finished living spaces, or challenging layouts may require two days for installation. Multi-family buildings and commercial properties typically take longer because of their size and complexity. However, most residential customers find the installation process quick and minimally disruptive to their daily routine.
After installation, you should wait at least 24 hours before testing to see if the system is working properly. Many companies provide free follow-up testing between 24 hours and 30 days after installation to confirm radon levels have dropped to safe levels.
Do I Need Radon Mitigation in Portland?
You need radon mitigation in Portland if testing shows radon levels in your home are at or above 4.0 pCi/L (picocuries per liter). The EPA recommends taking action to reduce radon when levels reach this point. However, many health organizations suggest considering mitigation even at lower levels between 2.0 and 4.0 pCi/L since there is no truly safe level of radon exposure.
Portland is located in a Zone 2 area according to EPA radon zone maps. This means Portland has moderate to high radon potential, with average indoor levels predicted to be between 2.0 and 4.0 pCi/L. However, these are just averages. Individual homes can have much higher or lower levels depending on many factors.
Certain Portland neighborhoods have particularly high radon levels. Areas like Alameda Ridge, Piedmont, and Montavilla show elevated radon in many homes. Parts of Portland near Mill Plain in neighboring Clark County, Washington also experience high radon levels, with about 50 percent of homes testing above 4.0 pCi/L in some hot spots.
Your home’s radon level depends on several factors beyond neighborhood averages. The type of soil beneath your home, how your home was built, the condition of your foundation, and even the weather can affect radon levels. The only way to know your home’s radon level is to test it. Testing is inexpensive and easy, and many radon companies offer professional testing services.
Radon is the leading cause of lung cancer among non-smokers in the United States. It causes over 20,000 deaths each year. The gas is colorless, odorless, and tasteless, so you cannot detect it without testing. If you smoke and your home has high radon levels, your risk of lung cancer is especially high.
The good news is that radon problems can be fixed. Professional radon mitigation systems effectively reduce radon levels to safe amounts in almost all cases. Many Portland companies guarantee their systems will bring levels below 2.7 pCi/L or even lower. The US Surgeon General and EPA recommend that all homes be tested for radon, regardless of location.