Tag Archives: Silicon Valley

Worries About Granite Lead to California Homes with Radon

A homeowner in Menlo Park, CA recently discovered that his home had 14 picoCuries/liter of radon, three times the EPA action level of 4 picoCuries/liter (pCI/L). He tested his home for radon because he was concerned about his new granite counters. However, his granite was not the source of the radon. He had “geologic” radon coming from the soil beneath his house.