Just completed a radon mitigation system installation for a homeowner in Grandville, Michigan! Why is this important? Radon is an invisible, odorless gas and the second leading cause of lung cancer in the U.S. In Michigan, approximately 1 in 4 homes have elevated radon levels. Grandville, located in Kent County, is designated as a Zone 2 area by the EPA, indicating moderate to high potential for elevated radon levels.