Wisconsin

Radon gas is a naturally occurring radioactive gas that can be found in all parts of the United States, including Wisconsin. Radon gas is formed by the decay of uranium in soil, rock, and water. When radon gas is released into the air, it can become concentrated in buildings, where it can pose a health risk to occupants. In Wisconsin, radon gas is a significant concern due to the state's geology. The state has a high concentration of granite and other types of rock that can contain high levels of uranium, which can lead to elevated levels of radon gas. The Wisconsin Department of Health Services recommends that all homeowners in the state test their homes for radon gas. If elevated levels of radon gas are detected, steps can be taken to reduce the concentration, such as installing a radon mitigation system. It is important to note that radon gas is odorless, colorless, and tasteless, so testing is the only way to know if it is present in a home or building. 

United States EPA State Map of Radon Gas Concentration

The U.S. EPA and the U.S. Geological Survey have evaluated the radon potential in the U.S. and have developed this map is to assist National, State, and local organizations to target their resources and to assist building code officials in deciding whether radon-resistant features are applicable in new construction. This map is not intended to be used to determine if a home in a given zone should be tested for radon. Homes with elevated levels of radon have been found in all three zones. All homes should be tested regardless of geographic location. The map assigns each of the 3,141 counties in the U.S. to one of three zones based on radon potential. Each zone designation reflects the average short-term radon measurement that can be expected to be measured in a building without the implementation of radon control methods. The radon zone designation of the highest priority is Zone 1.

	Zone 1	Highest Potential (greater than 4 pCi/L)
	Zone 2	Moderate Potential (from 2 to 4 pCi/L)
	Zone 3	Low Potential (less than 2 pCi/L)

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