Radon Reduction System Tide

Understanding the Risks in Metro East Illinois If you live in Belleville IL, Edwardsville IL, or O'Fallon IL, you probably know someone who has tested their home for radon. That is because much of Metro East Illinois sits in an EPA radon zone rated moderate to high. The soil here contains uranium-bearing minerals that break down over time and release radon gas. That gas seeps into homes through cracks in the foundation, gaps around pipes, and even through the concrete slab