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Radon Testing

Tracking Radon

The Tracking Network has radon testing data at the state and county level for some states. Users can explore the number of buildings tested, number and percent of pre-mitigation tests by radon level, number and percent of post-mitigation tests by radon level, median pre-mitigation test levels of radon, and maximum pre-mitigation levels of radon.

See how the Washington Tracking Program's improved radon exposure risk maps help keep residents safe.

Uses for the Data

Public health professionals can use the Tracking Network’s radon data to identify areas with low testing and potentially high levels of radon for targeted interventions.


The data included on the Tracking Network represent the level of radon found only in buildings that were tested for radon, not all buildings in an area. Radon levels can vary from place to place, even between neighboring buildings.

Data quality and quantity vary from state to state. Not all states identify if a radon test is pre- or post-mitigation. Post-mitigation test results are typically lower than pre-mitigation results, assuming that mitigation was successful. On the Tracking Network, test results that are not designated as pre- or post-mitigation are included with pre-mitigation data.

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