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 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 Basin 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.

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

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