Water Quality Unit

The Water Quality Unit includes regulatory oversight and technical assistance associated with stormwater permitting and management on VTrans facilities, striving to ensure proper design, construction, operation, maintenance, and regulatory compliance with Federal and State Water Quality Standards and Stormwater Management Rules, Regulations, and Laws.

VTrans Clean Water Factsheet 2022


Transportation Separate Storm Sewer System (TS4) General Permit

The Water Quality Unit oversees compliance on the Transportation Separate Storm Sewer System (TS4) Permit. The TS4 permit (effective 11/29/2017) is an all-encompassing permit for the Vermont Agency of Transportation that regulates stormwater discharges from VTrans road and non-road developed lands. It is specific to the unique linear nature of VTran’s infrastructure and allows several stormwater programs to be rolled into one comprehensive regulatory program.

TS4 Annual Report 2020

TS4 Annual Report Workbook 2020

For more information visit the VT Agency of Natural Resource's TS4 page:

 Transportation (TS4) General Permit


Water Quality Unit Collaborations

Lake Champlain Basin Program

Lake Champlain Basin Program

Rethink Runnoff

Rethink Runnoff 

Clean Water Advisory Committee

Clean Water Advisory Committee

Memphremagog Watershed Collaborative

Memphremagog Watershed Association


For additional information regarding VTrans Stormwater considerations in project design and development see the Highway Division’s Stormwater Management page.

The Water Quality Unit is managed by Jennifer Callahan, Stormwater Technician, who oversees 3 regional stormwater technicians. For contact information and regional coverage see the “Regional Stormwater Technician Coverage Map"

Jennifer Callahan, Stormwater Technician
Technical Services | District Maintenance & Fleet
Vermont Agency of Transportation
Dill Bldg, 2178 Airport Road – Unit A, Barre, VT 05641

802-498-4947 cell  |   jennifer.callahan@vermont.gov