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Transportation (TS4) General Permit

The Transportation Separate Storm Sewer System (TS4) General Permit is a new permit that covers stormwater discharges from all Vermont Agency of Transportation (VTrans) owned or controlled impervious surfaces.

The TS4 combines the stormwater requirements for VTrans associated with its designated regulated small municipal separate storm sewer systems (MS4s); industrial activities, commonly regulated under the Multi-Sector General Permit (MSGP); and previously permitted, new, redeveloped, and expanded impervious surface, commonly regulated under State Operational Stormwater permits.

Additionally, in order to meet the requirements of the Lake Champlain and Lake Memphremagog Phosphorus total maximum daily loads (TMDLs) and to ensure water quality protection across the entire State, the permit requires VTrans to develop a Phosphorus Control Plan (PCP) for its stormwater discharges in the Lake Champlain and Lake Memphremagog Basins and requires VTrans to reduce the discharge of pollutants from the TS4 to the maximum extent practicable (MEP) through compliance with the six minimum control measure requirements throughout the entire State.

TS4 General Permit (2022)

DEC reissued the TS4 General Permit in 2022

Application Materials

Note: All amendment application documents and supporting materials should be submitted via the Stormwater General Intake Form.

VTrans TS4 Authorization and Approved Plans

Archive Documents

For more information, contact Christy Witters by email at or by phone at (802) 490-6173.