For most tests we recommend using a Short Term test kit, especially for preliminary and exploratory testing. Short Term tests are accurate, fast, and inexpensive. A Short Term test takes approximately 2-4 days to complete.
Long Term testing is a good option to confirm the results of a Short Term test, or for buildings where the radon level is close to the EPA's action level. Long Terms are also very accurate, but cost more and take longer to complete the test. A Long Term test takes at least 91 days and up to 1 year to complete.
Radon in Water testing is generally not necessary for most homes. Radon in Water is not a health risk by itself; the primary danger is the radon escaping the water and entering the air. If you are concerned about your water, first perform a Short Term test. If the results of the Short Term test are elevated and you have a non-municipal water source, you may wish to test your water. It is extremely rare for municipal water sources to contain dangerous levels of Radon in Water.