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.

Draft TS4 General Permit (2022)

The Stormwater Program is in the process of re-issuing the TS4 General Permit.  The previous TS4 was issued in November 2017 and expires in November 2022.  The Program is providing the Draft TS4 for public comment from Friday, September 16 through Monday, October 24th and hosting a public meeting on Monday, October 17th.  For information about how to comment on the Draft TS4 or how to attend the public meeting, see the Public Notice document below.    

VTrans TS4 Authorization and Approved Plans

TS4 General Permit Documents

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

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

WSMD - Stormwater Home