Congratulations if you recently passed a home inspection—that’s a huge milestone, especially if you're buying or selling a property. But before you pop the champagne, one critical threat may have slipped through the cracks: radon gas. It’s invisible, odorless, and often overlooked, but radon can pose a serious health risk, even in homes that “pass” inspection.
In this guide, we’ll unpack why radon often gets missed, what it means for your home and health, and most importantly, how you can detect and resolve it before it becomes a silent danger.
What Is Radon and Why Should You Care?
Radon is a naturally occurring radioactive gas formed from the decay of uranium in soil, rock, and water. It seeps up through the ground and can enter homes through cracks in floors, walls, and foundations. Once inside, it can build up to dangerous levels, especially in basements and crawl spaces.
The Real Threat: Lung Cancer
The EPA and Surgeon General rank radon as the second leading cause of lung cancer in the U.S., right after smoking. Radon exposure causes over 20,000 lung cancer deaths annually in the United States alone. Even if you’re a non-smoker, prolonged radon exposure can seriously increase your risk of developing lung cancer.
Why Home Inspections Often Miss Radon
A typical home inspection checks for structural integrity, electrical systems, HVAC, plumbing, and visible signs of damage. However, radon testing is not typically included unless specifically requested.
It's Not on the Standard Checklist
Many homebuyers assume their inspection report covers all safety concerns. But unless your inspector offers radon testing as an add-on service—and you opt in—you could be living with high radon levels without even knowing it.
It's an Invisible Threat
Because radon has no color, odor, or taste, it can’t be detected without proper testing equipment. Unlike mold or termites, there are no visible signs of its presence, making it easy to overlook during even the most thorough walkthroughs.
Common Entry Points for Radon in the Home
Understanding how radon enters your home is crucial to knowing how to defend against it. Here are some of the most common radon entry points:
- Cracks in the foundation
- Gaps in floors or walls
- Construction joints
- Crawl spaces
- Sump pumps or floor drains
- Well water supply
If your home has any of these vulnerabilities, you could be at higher risk for radon infiltration, especially if you're in a high-radon zone.
Even New Homes Aren’t Safe
Many people assume newer homes are automatically protected. Unfortunately, that’s not the case.
Airtight Homes Can Trap Radon
Modern homes are often built to be energy-efficient, which means they’re more airtight. This can actually increase the concentration of radon inside, because it has fewer ways to escape. Without a dedicated radon mitigation system, a new home could still pose serious risks.
How to Check If You Have a Radon Problem
The only way to know if your home has high radon levels is to test for it. The good news is that radon testing is affordable and accessible.
Two Main Types of Radon Tests
- Short-Term Tests
- These measure radon levels over 2 to 90 days. They’re ideal for getting a quick snapshot of your radon situation, especially if you’re in the middle of a real estate transaction.
- Long-Term Tests
- These measure radon levels over 90 days to a year, offering a more accurate picture of your home’s average radon exposure.
DIY vs. Professional Testing
- DIY radon test kits can be purchased online or at hardware stores. They’re inexpensive but require careful placement and shipping to a lab for analysis.
- Professional radon testers provide faster, often more reliable results with calibrated electronic monitors.
Tip: If you're buying or selling a home, professional testing can give you documented results that can influence negotiations.
What Radon Levels Are Considered Dangerous?
The EPA recommends action if your home’s radon level is 4.0 picocuries per liter (pCi/L) or higher. However, no level of radon is considered completely safe.
- 0 to 1.9 pCi/L – Low risk
- 2 to 3.9 pCi/L – Caution zone; consider mitigation
- 4.0+ pCi/L – Take immediate action
Even if your levels fall in the caution zone, it’s a good idea to discuss radon mitigation options with a qualified contractor.
What to Do If You Have a Radon Problem
Don’t panic—radon problems are fixable. Mitigation is often simpler and less expensive than people assume.
Radon Mitigation Systems
A professional can install a radon reduction system, which usually includes:
- PVC piping to vent radon from beneath the foundation
- A radon fan to pull gas out and release it safely outside
This system is often referred to as a sub-slab depressurization system and can reduce radon levels by up to 99%.
Cost of Installation
The average cost for a radon mitigation system is between $800 and $1,500, depending on your home’s size and foundation type. Compared to the potential health risks, it’s a worthwhile investment.
Should You Still Buy a Home With High Radon?
Yes—but with a plan.
Radon shouldn’t necessarily be a dealbreaker. If the home has high levels of radon but no existing mitigation system, you can often negotiate:
- A price reduction
- Seller-paid mitigation installation
- Money held in escrow for post-sale remediation
What matters most is being informed and proactive. Don’t walk away without first knowing your options.
How to Make Radon Testing a Part of Every Home Sale
Given how serious radon exposure can be, it should become standard practice during every real estate transaction.
For Buyers:
- Always ask if the home has been tested for radon.
- If not, request professional testing as part of your due diligence.
- Get a quote for mitigation in advance, if needed.
For Sellers:
- Consider testing your home before listing it.
- If your home has a mitigation system, provide documentation and test results.
- Be upfront—it builds trust and can help your home sell faster.
Keep Testing Over Time
Even if you’ve already tested and installed a mitigation system, you’re not done for life.
- Test your home every 2 years, or after major renovations
- Check your radon fan regularly to make sure it’s still functioning
- Keep your mitigation system serviced and updated as needed
Radon levels can fluctuate due to weather, soil changes, and home improvements. Staying proactive is key to keeping your home safe long-term.
Conclusion: Don’t Let Radon Catch You Off Guard
Just because your home passed inspection doesn’t mean it passed the radon test. This silent gas can put your family’s health at risk without any warning signs. But with a little education, a quick test, and—if necessary—an affordable mitigation system, you can protect your home and your loved ones from a very real threat. For more information or to schedule a test, visit Colorado Springs Radon Mitigation.
Don't let a false sense of security fool you. Test for radon. Take action. Stay safe.
