THE 10 BEST Radon Testing Services in PORTLAND, OR
| Business Name | Key Services | Best For | Address | Hours | PS Rating |
|---|---|---|---|---|---|
| Environmental Works | Radon testing, mitigation, sewer services, oil tank decommissioning | Multi-family and commercial properties | 22820 NE Sandy Boulevard, Fairview, OR 97024 | Mon-Fri: 8:00 AM – 5:00 PM | 4.7/5 |
| Cascade Radon | Radon testing, mitigation, system design | Long-term EPA certified experience | Portland Metro Area (Multiple locations) | By appointment | 4.8/5 |
| Just Radon | Radon testing, mitigation, thermal scanning | Lifetime warranty systems | Lake Oswego, OR 97034 | 24/7 online scheduling | 4.6/5 |
| Alpha Environmental Services | Radon testing, mold, asbestos, environmental consulting | Comprehensive environmental testing | 11080 SW Allen Blvd, Ste 100, Beaverton, OR 97005 | Mon-Fri: 8:00 AM – 5:00 PM | 4.5/5 |
| Radon Testing and Mitigation PNW | Radon testing, mitigation, certified professionals | Guaranteed results with 30-year warranty | Portland, OR 97233 | Mon-Fri: 8:00 AM – 7:00 PM, Sat: 8:00 AM – 5:00 PM, Sun: 10:00 AM – 5:00 PM | 4.6/5 |
| Nonprofit Home Inspections | Radon testing, home inspections, continuous monitoring | Real estate transactions | Portland Metro Area | By appointment | 4.7/5 |
| John’s Waterproofing | Radon testing, mitigation, waterproofing services | Basement and crawlspace solutions | 219 Airport Road, Silverton, OR 97381 | Mon-Fri: 8:00 AM – 5:00 PM | 4.4/5 |
| Northwest Radon Detection | Professional radon testing, real estate home inspections | Same-day service for real estate | Portland Metro Area | By appointment | 4.8/5 |
| Hunter Home Inspections | Radon testing, home inspections, thermal imaging | Thorough inspection services | Portland Metro Area | By appointment | 4.7/5 |
| Rush Locates | Radon testing, oil tank searches, utility location | Combined services and accurate results | Portland Metro Area | By appointment | 4.5/5 |
#1. Environmental Works – Best for Multi-Family and Commercial Properties
Key Highlights:
- AARST-NRPP certified with over 15 years of experience serving Portland and Southwest Washington
- Provides immediate test results using state-of-the-art Sun Nuclear continuous radon monitors
- Offers lifetime guarantee to keep radon levels below WHO action level of 2.7 pCi/L
Environmental Works stands out as Portland’s number one environmental services company. They have performed thousands of radon tests and installed mitigation systems throughout Oregon and Southwest Washington since 2009. Their team uses professional grade continuous radon monitors that give you results right away instead of waiting weeks for lab analysis.
The company specializes in both residential and large-scale commercial projects. They work with property managers, homeowner associations, and government housing sectors to keep multi-family buildings safe. Their technicians are fully certified and follow strict EPA protocols. What makes them special is their free same-day services when possible and their commitment to designing systems that blend into your home’s appearance. They also offer free continuing education classes for realtors and homeowners about radon safety.
#2. Cascade Radon – Best for Long-Term EPA Certified Experience
Key Highlights:
- EPA certified for over 30 years making them the most experienced radon company in the Pacific Northwest
- Provides both short-term and long-term testing options with written reports
- Continuously monitors mitigation projects from start to finish until levels are safe
Cascade Radon brings three decades of expertise to every job. This family-owned business has been protecting Portland homes since before radon testing became widely known. Their long history means they have seen every type of radon problem and know exactly how to fix it.
They serve homes, schools, businesses, and public buildings across Oregon, Washington, and Idaho. The company performs all work according to EPA protocols and provides detailed written reports with recommendations. One in three properties in the Portland area has elevated radon levels, so their experience is incredibly valuable. They don’t consider a job done until radon levels are safely below the EPA action level. Their reputation in the community is built on consistent results and honest service over many years.
#3. Just Radon – Best for Lifetime Warranty Systems
Key Highlights:
- Double lifetime warranty that extends to the next homeowner
- Uses only Schedule 40 PVC or ABS piping instead of cheaper thin-wall materials
- FLIR thermal scanner technology to find hidden cracks under carpets and floors
Just Radon focuses exclusively on radon services, which means they are specialists in this field. They offer a unique double lifetime guarantee that covers you and the next owner of your home. This shows real confidence in their work quality.
The company uses the strongest materials available, including thick-wall Schedule 40 pipes that last much longer than standard options. They remove up to 15 gallons of dirt from beneath your foundation to create a powerful suction pit. This extra effort means they can use quieter fans while still getting excellent results. Their testing costs $150 and uses Corentium Pro continuous monitors. They offer 24/7 online scheduling for rush requests at no extra charge. All their fans are made in America and come with 10-year warranties. They guarantee radon levels below 4.0 pCi/L.
#4. Alpha Environmental Services – Best for Comprehensive Environmental Testing
Key Highlights:
- Over 25 years of experience serving the greater Portland area with full environmental services
- Offers radon testing plus mold, asbestos, lead, and oil tank services all in one company
- Same-day appointments available with professional testing equipment calibrated to EPA standards
Alpha Environmental Services is your one-stop shop for all environmental concerns. They handle radon testing alongside mold removal, asbestos inspection, and oil tank decommissioning. This makes them perfect if you need multiple services during a home purchase or renovation.
Their radon testing includes both short-term 48-hour tests and long-term 90-day monitoring options. They use continuous monitoring equipment that tracks radon levels every hour of the testing period. This gives you a complete picture of how radon levels change throughout the day and night. The company is fully licensed, bonded, and insured. Their office staff is known for being friendly and responsive. They serve Beaverton, Tigard, Lake Oswego, Salem, and surrounding communities. Many real estate agents trust them for inspection services because of their thorough photo documentation and clear explanations.
#5. Radon Testing and Mitigation PNW – Best for Guaranteed Results with 30-Year Warranty
Key Highlights:
- 30-year guarantee that radon levels will stay below EPA recommended 4.0 pCi/L
- Oregon state certified radon experts with 100% success rate in mitigation
- Free retesting included after mitigation system installation
Radon Testing and Mitigation PNW takes pride in being experts who focus only on radon problems. They are certified as radon specialists in Oregon and use the most efficient testing and mitigation techniques available today. The company is licensed, insured, and bonded.
They offer both DIY testing kit options and professional testing services at competitive prices. Their mitigation systems typically cost between $1,500 and $2,000 for Portland area homes, depending on size and foundation type. What sets them apart is their commitment to doing the job right the first time. They employ only radon-certified professionals who receive thorough training. The company provides detailed education about radon dangers and helps customers understand safe radon levels. They recommend taking action at 2.7 pCi/L following World Health Organization guidelines, which is stricter than EPA recommendations.
#6. Nonprofit Home Inspections – Best for Real Estate Transactions
Key Highlights:
- Professional continuous electronic monitors provide instantaneous results after minimum testing period
- Follows EPA guidelines specifically designed for real estate transactions
- Certified by InterNACHI and International Association of Certified Indoor Air Consultants
Nonprofit Home Inspections specializes in helping homebuyers make informed decisions. Their radon testing is designed to fit within the tight timelines of real estate contracts. Tests run between 2 to 7 days under closed home conditions, with 48 hours being the minimum for real estate deals.
Studies show that 1 out of 4 homes in Portland has elevated radon levels. Getting a professional test before closing lets you negotiate mitigation costs into your purchase agreement. The company uses professional grade monitors that take hourly samples and include motion sensors to prevent tampering. Their inspectors are Oregon state certified home inspectors with additional radon testing certifications. They provide detailed reports with photos and recommendations. The ancient Missoula flood plains make Portland especially prone to high radon, with about 25% of metro homes needing mitigation.
#7. John’s Waterproofing – Best for Basement and Crawlspace Solutions
Key Highlights:
- Member of National Radon Defense network with extensively trained technicians
- Specializes in radon mitigation for different foundation types including basements and crawlspaces
- Offers free in-home consultations and flexible payment options
John’s Waterproofing combines radon services with basement waterproofing expertise. This dual focus makes them ideal if you have moisture problems along with radon concerns. They understand how water and radon both enter through foundations and can address both issues.
The company serves Portland, Vancouver, Salem, Eugene, and nearby Oregon and Washington communities. Their radon mitigation specialists conduct structural analysis and design surveys during free consultations. They customize each system based on whether your home has a basement, crawlspace, or combination foundation. They offer various payment options since radon mitigation is not always a budgeted expense. Their technicians follow best practices established by the National Radon Defense network. They also provide educational videos explaining how radon mitigation methods work to reduce levels in your home.
#8. Northwest Radon Detection – Best for Same-Day Service for Real Estate
Key Highlights:
- Specializes in 48-hour radon screenings using cutting-edge certified radon meters
- Provides hourly reports showing radon concentration levels and weather conditions
- Can detect potential test tampering with sensitive monitoring technology
Northwest Radon Detection focuses specifically on radon testing for home inspections and real estate professionals. They understand that timing matters when you’re buying or selling a home. Their equipment is calibrated annually by certified laboratories to ensure accuracy.
The company uses sophisticated continuous radon monitors instead of charcoal canisters that need lab analysis. This means you get immediate results following the test instead of waiting days or weeks. Their reports show hourly radon levels in an easy-to-read graph format. The meters detect movement or disturbance during testing, which helps ensure accuracy if current occupants might interfere with the equipment. Radon is the second leading cause of lung cancer and the first cause for non-smokers. Their professional service helps homeowners, realtors, and home inspectors get reliable data quickly.
#9. Hunter Home Inspections – Best for Thorough Inspection Services
Key Highlights:
- Offers comprehensive home inspections including radon testing, sewer scopes, and thermal imaging
- Provides detailed reports with beautiful color photos documenting all findings
- Serves northwest Oregon including Portland, Tigard, Hillsboro, and surrounding areas
Hunter Home Inspections takes a complete approach to home safety. They combine radon testing with full property inspections, pre-drywall checks, and commercial building assessments. This makes them perfect for buyers who want one company to handle all inspection needs.
Their inspection reports are known for being easy to read with clear color photographs. They clearly outline all safety hazards and potential issues in a summary page. Clients receive both verbal explanations during the inspection and detailed written reports afterward. The company also offers drone roof inspections, thermal imaging, and underground tank sweeps. Their multi-service approach saves time and money compared to hiring separate specialists. They serve communities throughout northwest Oregon including Beaverton, Wilsonville, Oregon City, Lake Oswego, and Gresham. Their goal is to help clients feel confident about their home purchase decisions.
#10. Rush Locates – Best for Combined Services and Accurate Results
Key Highlights:
- Radon testing costs $150 and can be scheduled with oil tank searches at the same time
- Uses NRSB and NRPP approved continuous radon monitoring systems
- Provides results in as little as 48 hours with highly accurate equipment
Rush Locates offers convenient combined services that save you money. If you need both a radon test and an oil tank search, you can schedule them together. This is especially helpful for older Portland homes where underground tanks are common.
Their continuous monitoring systems detect temperature, humidity, and movement in addition to radon levels. This helps identify any tampering or unusual conditions during testing. You get results immediately when the test finishes instead of waiting for lab processing. The company explains that Portland’s soil contains uranium that breaks down to release radon gas. This radioactive element penetrates all building materials. Homes next door to each other can have very different radon levels because of soil distribution and building construction. Their testing helps you know exactly what you’re dealing with so you can make informed decisions about mitigation if needed.
How Much Does Radon Testing Cost in Portland?
Radon testing prices in Portland typically range from $150 to $200 for a standard short-term test. Most companies use continuous radon monitors that provide results within 48 hours. This is much faster than mail-in charcoal test kits that can take several weeks.
The cost usually includes a professional technician setting up the equipment, monitoring the test remotely, and providing a detailed report with hourly readings. Some companies offer same-day service or rush testing at no extra charge. Long-term tests that run for 90 days or more cost slightly more but give more accurate average readings.
If you’re buying a home, radon testing is a small investment compared to the cost of installing a mitigation system later. Many inspection companies bundle radon testing with other services like sewer scopes or oil tank searches at a discount. DIY test kits from hardware stores cost $15 to $30 but may include hidden lab fees and take longer to process. Professional testing gives you credible results that sellers and lenders will accept during real estate transactions.
What Radon Level Requires Mitigation in Portland Homes?
The EPA recommends taking action if radon levels measure 4.0 pCi/L or higher. However, the World Health Organization suggests a lower action level of 2.7 pCi/L. Many top Portland radon companies guarantee their mitigation systems will reduce levels below the WHO standard.
There is no completely safe level of radon exposure. Even levels between 2.0 and 4.0 pCi/L carry some health risk. If your test shows levels in this range, you should seriously consider mitigation. The average indoor radon level in American homes is 1.3 pCi/L, while outdoor air averages 0.4 pCi/L.
Portland has higher radon levels than many other cities because of ancient flood deposits from the Missoula floods. About 25% to 33% of homes in the Portland metro area test above the EPA action level. Some neighborhoods like Alameda Ridge in Portland and Mill Plain in Clark County have even higher rates, with up to 50% of homes showing elevated readings. Getting your home tested is the only way to know your specific radon level since it varies dramatically from house to house.
How Long Does It Take to Install a Radon Mitigation System?
Most radon mitigation systems can be installed in a single day for typical single-family homes. The installation usually takes 4 to 8 hours depending on your home’s foundation type and complexity. Homes with crawlspaces take slightly longer than those with basements or slabs.
The process involves creating a suction point by drilling through your foundation, removing soil from beneath, and installing pipes that vent radon gas above your roofline. Technicians also seal cracks and openings where radon enters. The fan that powers the system gets mounted outside or in your attic. Quality companies test the system immediately to verify it’s working properly.
After installation, you should wait at least 24 hours before doing a follow-up radon test to confirm the system is effective. Most companies include free retesting after installation. The EPA recommends waiting no more than 30 days to retest. Many Portland companies guarantee their work for life, meaning they’ll return to add additional suction points at no charge if levels don’t drop enough. Properly installed systems require almost no maintenance and fans typically last 7 to 10 years before needing replacement.