Radon in Water
Most of the radon in indoor air comes from the soil underneath the home or building. However, radon gas can also dissolve and accumulate in water from underground sources (ground water), such as wells. When water that contains radon is used in the home for showering, washing dishes, and cooking, radon gas escapes from the water and goes into the air similar to carbonated soda drinks where dissolved carbon dioxide in the soda is released into the air when you open the lid. Radon is not a concern in water that comes from lakes, rivers, and reservoirs (surface water), because the radon is released into the air before it ever reaches your tap. Only about 1-2 percent of radon in the air comes from drinking water.