Vermont’s online mapping presents radon risks in Vermont by illustrating radon factors in relation to geology, radon test results by town, and rates of radon testing by town. The maps illustrate radon risk and encourage testing. The Vermont Department of Health presents the information in the Vermont Environmental Health Tracking App.
The first map, illustrates the relationship of geology and radon testing result by showing
Bedrock Belt: % Tested Residences w/ Elevated Radon. Elevated radon is > 4 pCi/L.
Bedrock geology is presented in these zones found in Vermont:
• Devonian Granites: 14.9%
• Connecticut Valley Zone: 13.4%
• Taconic Allochthon Zone: 12.2%
• Green Mountain Zone: 8.1%
• Champlain Valley Zone: 7.4%
• Mesoproterozoic Zone: 7.0%
• Bronson Hill Zone: 6.4%
• Cretaceous Granites: Fewer than 20 tests
By clicking on a particular county in the zone, details of the geology and testing are presented. For example, in the Devonian Granites zone, testing indicates higher prevalence of radon:
Devonian Granites
Devonian granites that intruded into rocks of the Connecticut Valley Zone and adjacent zones.
• Number of tested residences: 121
• Percent of tested residences w/ elevated radon: 14.9%
• Number of untested residences: 4442
• Number of untested residences likely to have elevated radon: 661
A second map present Elevated Radon Results (by Town).
Rates of Elevated Radon Results
Percent of Tested Residences w/ Elevated Radon categories are:
> 20% - 40%
> 10% – 20%
0% – 10%
Fewer than 20 residences tested
For instance, on the clickable map, Williamstown shows:
• Number of tested residences: 61
Percent of tested residences w/ elevated radon: 21.3%
A third map shows Rates of Radon Testing (by Town). For Williamstown, this map breaks down the testing and reports as:
Williamstown
• Number of tested residences: 61
Percent of tested residences: 4.4%
For more information:
Call: 800-439-8550
Email: radon@vermont.gov
United States