The Oregon Health Authority, Radon Awareness Program, provides radon data to the public presented in terms of risk. The database and categories have been updated to January 2022.
The risk level for elevated indoor radon within each zip code was determined through a classification system that considers four factors:
1. the number of single-family residential locations with a test result
2. the maximum test result value
3. the average test result value
4. the percent of locations with a test result that was greater than or equal to 4 picocuries per liter (piC/L) within the zip code.
Risks are categorized as low, moderate, high and not assigned.
Risk Level with asterisks (i.e “Low”) indicates there are only 5-19 locations with a radon test result. "Not Assigned" indicates there were fewer than 5 locations with a test result.
Radon Risk Level Assignment was determined through a classification system that considers three factors:
1. the maximum observed test result value
2. the average test result value
3. the percent of locations with a test result that was greater than or equal to 4 picocuries per liter piC/L) within the zip code.
Points are given for each factor and a total of those points is used to determine the overall risk score for the zip code.
For more information, contact:
Radon.program@dhsoha.state.or.us
Telephone 971-673-0440
United States