We live in Adams County Pa. When we bought our house there in 1994 the home inspection included a radon test which passed! After my neighbor realized we didn't have any type of mitigation system he insisted we get the house retested. We we're shocked when the results came back well above 15! A second test was even higher.
Luckily for us the builder made provisions so the area beneath the basement floor could be easily vented. We installed a vent fan and lowered the reading to less than 1.3.
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