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Radon gas can seep into homes through foundation cracks, and St. Louis sits on granite-rich soil that can release this radioactive threat. Local mitigation experts use sub-slab depressurization systems to pull the gas from below your house and vent it safely outside, often requiring specialized drilling through the area's clay-heavy ground. Testing kits are cheap and widely available at hardware stores, but if levels are high, hiring a certified radon mitigator with Missouri-specific training e…