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Radon is a hidden danger that many homeowners don’t think about until a test shows high levels. You can’t see radon. You can’t smell it. But long-term exposure to radon gas is one of the leading causes of lung cancer in the United States. The good news is that radon problems can be fixed. Radon mitigation systems are proven, effective, and commonly installed in homes across the country. In this guide, we’ll explain how radon mitigation systems work, what happens during installation, and what you can expect after the system is in place . What Is Radon and Why Is It Dangerous? Radon is a radioactive gas that forms naturally when uranium breaks down in soil and rock. It moves up through the ground and can enter homes through: Cracks in concrete floors Gaps around pipes and sump pumps Crawl spaces Basement walls and foundations When radon builds up indoors, it becomes a serious health risk. According to the EPA, radon is the second leading cause of lung cancer and the leading cause among non-smokers in the U.S. Radon levels are measured in picocuries per liter (pCi/L). The EPA recommends fixing your home if radon levels are 4.0 pCi/L or higher . What Is a Radon Mitigation System? A radon mitigation system is a setup designed to reduce radon levels inside a home . It works by pulling radon gas from beneath the house and safely releasing it outside before it can enter living spaces. Most homes use an active soil depressurization system , which is the most effective and widely recommended radon solution. How Radon Mitigation Systems Work Radon mitigation systems work by changing the air pressure under your home so radon is redirected outdoors instead of inside. Here’s how the process works step by step: 1. Radon Is Collected from Beneath the Home A small hole is drilled into the basement floor or slab. This allows access to the soil or gravel beneath the home, where radon gas collects. In homes with crawl spaces, a sealed plastic membrane is placed over the ground to collect radon from below. 2. PVC Piping Moves Radon Upward PVC pipes are installed from the collection point and run through the house or along the exterior. These pipes create a pathway for radon gas to move upward. 3. A Radon Fan Pulls Gas Out A quiet, energy-efficient radon fan is installed (usually in the attic or outside the home). The fan continuously pulls radon gas from beneath the house and pushes it up through the piping. 4. Radon Is Released Safely Outside The radon gas is vented above the roofline, where it safely disperses into the outdoor air. This keeps radon from re-entering the home. 5. Indoor Radon Levels Drop Once the system is running, radon levels inside the home typically drop within 24 to 48 hours. Most systems reduce radon levels by up to 99% . Types of Radon Mitigation Systems Not every home is the same, so radon mitigation systems may vary depending on your foundation. Sub-Slab Depressurization (Most Common) Used for homes with basements or concrete slabs. This is the most effective and widely used system. Crawl Space Mitigation Uses a sealed vapor barrier and ventilation to prevent radon from entering living spaces. Block Wall Depressurization Used when radon enters through hollow foundation walls. A professional radon contractor will recommend the best system for your home’s layout. What to Expect During Radon Mitigation Installation Many homeowners worry that installation will be messy or disruptive. In reality, radon mitigation is usually fast and minimally invasive. Before Installation A radon test confirms elevated levels The contractor inspects your foundation and layout System design is planned for best performance and appearance During Installation Installation usually takes 3 to 6 hours Small holes may be drilled in concrete or block walls PVC piping is installed neatly and securely The radon fan is mounted outside or in the attic After Installation The system runs continuously A manometer (pressure gauge) is installed so you can see the system is working Post-install radon testing confirms reduced radon levels Most homeowners can stay in their home during the installation. What Does a Radon Mitigation System Look Like? Radon systems are designed to blend in as much as possible. Pipes are usually white or neutral-colored and routed through utility areas, garages, or exterior walls. The radon fan is quiet and energy-efficient. Most homeowners don’t notice it running after the first few days. How Much Does Radon Mitigation Cost? The cost of a radon mitigation system in the U.S. typically ranges widely, depending on: Home size Foundation type System complexity Local building requirements While this is an investment, it’s small compared to the long-term health risks of radon exposure. Do Radon Mitigation Systems Really Work? Yes. Professionally installed radon mitigation systems are highly effective. Most homes see radon levels drop below the EPA action level after installation. With proper installation and regular checks, systems continue working for many years with minimal maintenance. Maintenance and System Care Radon mitigation systems require very little upkeep. Check the system gauge monthly Listen for unusual fan noise Replace the fan if it fails (typically lasts 5–10 years) Retest radon levels every 2–3 years A professional inspection can ensure your system stays effective. Why Professional Installation Matters Radon mitigation is not a typical DIY project. Proper design, sealing, and fan placement are critical for success. Certified radon professionals: Follow EPA guidelines Use approved materials Ensure safe venting Verify results with testing Professional installation ensures your system works safely and efficiently. Final Thoughts  Radon mitigation systems are a proven way to protect your home and family from the dangers of radon gas. Understanding how they work and what to expect makes the process simple and stress-free. Schedule a professional radon test today and take the first step toward a safer, healthier home. FAQs About Radon Mitigation Systems