Michigan Administrative Code
Department - Licensing and Regulatory Affairs
Bureau of Construction Codes
Construction Code Commission General Rules
Construction Code
Part 5 - RESIDENTIAL CODE
Section R. 408.30547a - Radon Control Methods
Current through Vol. 24-16, September 15, 2024
Rule 547a.
Figure AF101 and table AF101 are amended to read as follows:
Figure AF101. EPA map of radon zones.
a. pCi/L standard for picocuries per liter of radon gas. The U.S. environmental protection agency (EPA) recommends that all homes that measure 4 pCi/L and greater be mitigated. The EPA and the U.S. geological survey have evaluated the radon potential in the U.S. and have developed a map of radon zones designed to assist building officials in deciding whether radon resistant features are applicable in new construction.
The map assigns each of the 83 counties in Michigan to 1 of 3 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 highest priority is zone 1. Table AF101 lists the zone 1 counties illustrated on the map. More detailed information can be obtained from state-specific booklets (EPA-402-R-93-021 through 070) available through state radon offices or from EPA regional offices.
Figure AF101
EPA Map of Radon Zones
Table AF101
High Radon-Potential (Zone 1) Countiesa
Michigan Counties
Branch
Calhoun
Cass
Hillsdale
Jackson
Kalamazoo
Lenawee
St. Joseph
Washtenaw
a. The EPA recommends that this county listing be supplemented with other available state and local data to further understand the radon potential of a zone 1 area.
