Another crawlspace method is to cover the earth floor with a heavy plastic sheet and then use a vent pipe and fan to draw the radon from under the sheet into the outdoors. Other radon reduction techniques that can be used in any type of house include sealing, house pressurization, natural ventilation, and heat recovery ventilation. However, most of these methods are considered to be either temporary measures or only partial solutions to be used in combination with other measures. Sealing cracks and other openings in the foundation is a basic part of most approaches to radon reduction. Unfortunately, the use of sealing alone has not been shown to lower radon levels significantly.
Radon gas can enter the home through well water.
It is released into the air when water is used for showering and other household uses. Swallowing water with high radon levels poses some risks too, although it is believed to be much lower than the risk from breathing air containing radon. Testing devices to determine the radon level in water are different than the test for indoor air levels. High levels of radon are extremely dangerous to you and your family. If your test results are high, you should take action.