The 2016 MS4 general permit applies to all municipalities that are located partially or totally within an "Urbanized Area" and with a minimum of 1,000 people in that urbanized area. Urbanized areas are determined based on the 2010 U.S. Census. This includes 113 municipalities who were subject to the previous permit plus 8 new municipalities for a total of 121 towns. It also includes all state and federal institutions that operate a separate storm sewer system.
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The 2017 MS4 General Permit also appliues to any state or federal facility that
This does not include the Department of Transportation which will be subject to its own permit.