For results less than 4 pCi/L, USEPA’s Action Level, no action is needed. Consider retesting in two years.

If results are close to 4 pCi/L, you may wish to perform a long-term test for a better understanding of your year round average.

What if Your Results Are Over 4 pCi/L?

When results are over 4 pCi/L, the recommendation is to perform a second test. If the results are less than 10 pCi/L perform either a short-term or long-term test. If 10 pCi/L or more, perform another short term test.

If the second or average results are above 4 pCi/L, contact a licensed mitigation contractor to reduce radon levels in your home to below 4 pCi/L.

© University of Illinois Board of Trustees. http://www.takeactiononradon.uiuc.edu

testing for radon

how to test

where to find tests

conducting the test

interpreting the results