Radon is a silent, invisible, and deadly gas that affects thousands of homes across Colorado. With nearly half of Colorado homes testing above the EPA’s action level of 4.0 pCi/L, radon exposure has become a serious concern for homeowners, buyers, and builders alike.
While testing for radon is the first and most critical step, choosing the right certified professional to conduct that test is just as important. This guide will walk you through how to evaluate and hire a qualified radon testing expert in Colorado, ensuring you and your family are protected by accurate, trustworthy results.
What Is Radon, and Why Is It Prevalent in Colorado?
Radon is a naturally occurring radioactive gas that forms from the decay of uranium in the soil. It seeps into homes through cracks in foundations, crawl spaces, sump pumps, and even well into water.
Colorado’s geology is particularly rich in uranium deposits, which means radon levels here are consistently higher than in most other U.S. states. Combine this with airtight homes built for energy efficiency, and you’ve got a perfect environment for radon buildup.
The Risks of Exposure: Health Consequences of Radon Gas
The EPA ranks radon as the second leading cause of lung cancer in the United States, just behind smoking. Long-term exposure to elevated radon levels can cause:
- Lung damage over time
- Increased cancer risk for non-smokers
- Respiratory complications for children and the elderly
Because you can’t see, smell, or taste radon, testing is the only way to know if your home is safe.
Why You Should Hire a Certified Radon Testing Professional
While DIY radon kits exist, they often provide inaccurate or misleading results if used incorrectly. Certified professionals use high-quality equipment, follow EPA guidelines, and provide interpretable, legally recognized results.
A certified professional can:
- Ensure proper test placement
- Use calibrated and monitored equipment
- Detect short- and long-term exposure levels
- Provide reliable, unbiased results
Understanding Certification Bodies: NRPP vs. NRSB
In the United States, there are two primary radon certification organizations:
1. National Radon Proficiency Program (NRPP)
NRPP-certified professionals have passed rigorous exams and adhere to quality standards set by the American Association of Radon Scientists and Technologists (AARST).
2. National Radon Safety Board (NRSB)
This organization certifies measurement and mitigation experts and requires regular re-certification to ensure up-to-date knowledge and equipment.
Both programs require:
- Training in EPA protocols
- Proof of equipment calibration
- Ethical testing practices
- Continuing education
Pro tip: Ask to see a copy of your tester’s certification or verify it on the NRPP/NRSB website.
Colorado Radon Guidelines & Local Best Practices
Currently, Colorado does not require state licensure for radon professionals. However, the Colorado Department of Public Health and Environment (CDPHE) strongly recommends using NRPP- or NRSB-certified testers.
In many real estate transactions, a certified radon test is required by the buyer’s lender or insurance provider. Without certified documentation, results may be rejected.
10 Questions to Ask Before Hiring a Radon Tester in Colorado
To ensure you’re hiring a qualified expert, ask the following:
- Are you NRPP or NRSB certified?
- How often do you calibrate your equipment?
- Do you follow EPA and AARST measurement standards?
- What kind of testing devices do you use?
- Do you offer short-term and long-term testing?
- Will I receive a written, detailed report?
- How long does the testing take, and when will I get results?
- Do you offer mitigation as well? (Some prefer separate contractors to avoid conflicts.)
- Do you have insurance and local references?
- What are your fees and what is included in the price?
Types of Radons Testing Devices Professionals Use
Professional testers typically use EPA-approved devices, including:
- Continuous Radon Monitors (CRMs) – Real-time hourly readings, tamper-proof
- Electret Ion Chambers – Passive, lab-tested for long-term use
- Charcoal Canisters – Affordable short-term tests used under controlled conditions
A certified tester will ensure devices are properly maintained and results are validated.
Red Flags: Signs of an Unqualified Radon Tester
Avoid testers or companies that:
- Can’t provide valid certification
- Offer “free” radon testing services with no explanation
- Skip written reports or formal documentation
- Combine testing and mitigation without disclosure
- Lack a business address or proof of insurance
Choosing poorly can lead to inaccurate results or costly rework.
The Radon Testing Process: Step-by-Step
Here’s what to expect when you hire a certified radon tester:
- Pre-test Consultation – They assess your home and recommend a strategy.
- Device Placement – Usually in the basement or lowest livable space.
- Closed Home Protocol – Windows and doors remain closed for accurate measurement.
- Test Period – Typically 48 hours for short-term tests.
- Results – Delivered as a detailed report, often within 24 hours of pickup.
What to Do If Your Radon Levels Are High
If your radon levels exceed 4.0 pCi/L, the EPA recommends immediate mitigation. Solutions may include:
- Active Soil Depressurization (ASD)
- Sealing foundation cracks
- Crawl space encapsulation
- Radon exhaust fans
Learn more on our Radon Mitigation page
DIY vs. Certified Testing: What’s the Difference?
| DIY Test Kit | Certified Professional |
|---|---|
| Lower cost but error-prone | Reliable, calibrated equipment |
| No certification | EPA-compliant & lender-approved |
| Limited data | Full analysis and explanation |
| No professional guidance | Certified health and safety recommendations |
Why Choose Colorado Radon Mitigation for Your Radon Testing Needs?
At Colorado Radon Mitigation, we pride ourselves on delivering NRPP-certified, accurate, and prompt radon testing services tailored to Colorado homes. With years of local expertise, we understand the geological risks and provide science-backed solutions to protect your health.
Get in Touch — Your Home’s Safety Starts Here
Don’t leave your radon testing a chance. Contact us today for a certified inspection and peace of mind. Whether you’re buying, selling, or simply want to protect your family, we’re here to help.
Frequently Asked Questions
Why is radon such a big concern in Colorado?
Colorado has high levels of uranium in its soil, which naturally decays into radon gas. Combined with tightly sealed, energy-efficient homes, this makes radon buildup a serious risk in many parts of the state.
What certification should I look for in a radon tester?
Look for certification from either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). These credentials ensure the professional follows EPA guidelines and use calibrated, reliable equipment.
Are DIY radon test kits accurate enough?
DIY kits can be prone to user error and may not meet the standards required in real estate or legal documentation. Certified professionals provide tamper-proof devices, accurate readings, and detailed reports you can rely on.
How long does professional radon testing take?
Short-term tests typically take 48 hours, followed by a lab or device analysis. Most certified testers will provide a detailed report within 24–48 hours after retrieving the device.
What if my home tests are above the EPA’s recommended radon level?
If your test shows levels above 4.0 pCi/L, mitigation is recommended. This can include sealing cracks, installing venting systems, and other techniques tailored to your home. Colorado Radon Mitigation offers certified mitigation services to reduce radon levels effectively.