Service Description: EGLE created this map to show the radon information for first time tests, without active radon mitigation systems, by zip code. This map is based on results from the supplier that manufactures and analyzes short-term radon test kits purchased through the EGLE radon program. When sufficient data are available; the map will display minimum and maximum radon levels; total number of tests, mean and median values; the number of test results below a level of concern (2 picocuries per liter, pCi/L), in the recommended retest range (2 – 4 pCi/gL) and the recommended mitigation level (greater than 4 pCi/L); percentage of tests greater than 2 pCi/L; and percentage of tests greater than 4 pCi/L. The data set is updated approximately every quarter with the preceding 10 years’ worth of test results.
EGLE’s Michigan Indoor Radon Map was created with data supplied to the state by organization(s) that manufacture and/or analyze short term radon test kits. This tool is intended to help citizens have an understanding of radon concentrations in a given zip code and how indoor radon levels are geologically dependent. It also assists the EGLE radon outreach specialist in identifying areas with low/no testing rates and areas with higher likelihoods of increased indoor radon presence. Data (indoor radon concentration) is collected from organization(s) willing to provide information, which is then filtered to include values associated with first time tests and without active radon mitigation systems. Full analytical data will not be displayed for zip codes with less than 5 test results, only the test kit count will be shown. A zero value indicates insufficient data for analysis and a null value indicates no tests were provided. Statistical analysis has only been done on first time radon tests. It should be noted that in several zip codes total number of tests indicates either first time tests, follow up tests, post repair tests, testing for real estate, or unknown testing. Email radon@michigan.gov for any questions relating to the data.
The dataset includes results for approximately the preceding 10 years. Data will be refreshed at a rate no more frequently than monthly, but at least quarterly. A full new dataset will be provided for each transmittal. Download the data behind this map on EGLE's Open Data Portal. View the Web App.
Field Name
Description
ZipCode
ZIP Code Number
POName
Post Office Name
MinimumRadonLevel
Minimum value of 1sttime tests*
MaximumRadonLevel
Maximum value of 1sttime tests*
TotalTests
Count of total number of radon tests done*
TotalFirstTimeTests
Count of total number of 1sttime radon tests done*
AverageRadonLevel
Mean value of 1sttime tests *
Shown on the Map As:
< 2 pCi/L (Retest every 2 -5 years)
≥ 2 - 3.9 pCi/L (Mitigation Suggested)
≥ 4 pCi/L (Mitigation Recommended)
MedianRadonLevel
Median value of 1sttime tests*
TestsGreaterThan2pCi
Count of 1sttime tests greater than 2 pCi/L*
TestsGreaterThan4pCi
Count of 1sttime tests greater than 4 pCi/L*
PercentTestsGreaterThan2pCi
Number of 1st time tests above 2 pCi/L divided by the total number of 1sttime tests*
PercentTestsGreaterThan4pCi
Number of 1st time tests above 4 pCi/L divided by the total number of 1sttime tests*
*IMPORTANT NOTE: Full analytical data will not be displayed for zip codes with less than 5 test results, only the test kit count will be shown. A zero value indicates insufficient data for analysis and a null value indicates no tests were provided.
Disclaimer: EGLE makes every attempt to ensure data accuracy but cannot guarantee the completeness or accuracy of the information contained within these datasets. The purpose of this map is to assist residents with understanding radon risk potential. This map is not intended to be used to determine if a home in a given area should be tested for radon. Homes with elevated levels of radon have been found in all 83 counties. All homes should be tested regardless of geographic location. ZIP code boundaries do not correspond to legal or administrative boundaries and were originally created for postal delivery purposes. ZIP code boundaries are subject to change over time and are not precise due to the linear nature of postal routes. This dynamic nature makes ZIP codes less reliable for long-term geographical analysis. The USPS does not offer up an authoritative layer for use by mapping professionals. The ZIP code boundaries used in this analysis are sourced from ESRI.
Copyright Text: Indoor Radon Program, Materials Management Division (MMD), Michigan Department of Environment, Great Lakes, and Energy (EGLE)