Short term, long term, and continuous tests are available for radon. Tests should be conducted in the lowest livable area of your home (remember how radon is denser than air?). If you are considering selling your home, I highly recommend conducting a short term radon test before listing the home on the market. It doesn't cost much and is very much worth knowing the results before you're in the middle of a transaction!
Most people start with a short term test to determine whether or not further testing is necessary. The test takes between 2-7 days and are then mailed to a lab to determine the results. These are available at most home improvement stores and online.
Long term tests measure radon levels between 90 days and a year. They are more accurate than short term tests because radon levels can vary significantly from day to day and month to month. These tests are usually available through state agencies and online retailers.
Continuous radon testing devices plug into an outlet and can be used for both short and long term testing. They will give you a running average radon level. These are available from online retailers such as Amazon.
Home buyers: It's important to note that if you purchase a home in summer and conduct a radon test, you should conduct another test in winter when radon levels are more likely to be an issue.
SHOULD I TAKE ACTION?
One out of every 15 homes in the U.S. have radon levels that should be lowered. Fortunately, reliable techniques exist to reduce radon levels in homes so that almost any home with high radon levels can be fixed. If you have a radon problem, you can hire an experienced radon contractor or accomplish the repairs yourself.
The EPA recommends doing a second test if an initial short-term test registers 4 picoCuries per liter (pCi/L) or higher. A long term test is ideal, but you can perform a second short term test if you need results quickly. If the second test results in levels higher than 4 pCi/L, consider taking action to mitigate radon levels in the home.
WHAT CAN I DO TO MITIGATE RADON IN MY HOME OR REDUCE RISK?