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dec home > wsmd home > ecosystem restoration program > idde program
Stormwater Mapping and Illicit Discharge Detection and Elimination Program
Statewide

 

I

In 2000 the Vermont Legislature required the Department of Environmental Conservation (VTDEC) to implement a statewide program to promote detection and elimination of improper or illegal connections and discharges. (Sec. 3. 10 V.S.A. § 1264 (b)(9)). Illicit discharges are discharges of wastewater or industrial process water into a stormwater only drainage system. The legislature's intent was to expand illicit discharge detection and elimination (IDDE) efforts from the communities—all in the greater Burlington area—required to perform IDDE in compliance with the Environmental Protection Agency's Phase II Stormwater Rule to encompass all developed areas of the Vermont. Following the legislature's mandate, VTDEC has assisted municipalities not subject to the Phase II Stormwater Rule by mapping drainage systems and performing IDDE. This work, funded through grants from the state Clean & Clear/Ecosystem Restoration Program, USEPA Section 319 and the Lake Champlain Basin Program, has been completed for all major urbanized areas in the Missisquoi, Lamoille, lower Winooski (outside the greater Burlington area), Otter, Poultney River Basins and the three largest Connecticut River Basin towns and is ongoing in the Lake Memphremagog, Upper Winooski, White and Black River Basins and in the Town of St Johnsbury. About eighty communities have had GIS (Geographic Information System) drainage maps completed. Stone Environmental, Watershed Consulting Associates and Aldrich-Elliott Engineers in conjunction with several watershed associations (Friends of the Winooski River and Friends of the Mad River) have or are currently conducting IDDE surveys in sixty-five non-designated MS4 communities. Consultants have identified 2078 discharge points, about 700 of which were flowing when inspected. A wastewater source was indicated at 153 discharge points. Other types of contamination included petroleum (16 locations), treated drinking water (42 locations), heated water, pet and septic waste, paint and road salt. By combining drainage mapping, environmental investigative work, and municipal cooperation, this effort has eliminated numerous wastewater discharges, decreasing phosphorus by an estimated 200 kg per year to Lake Champlain, and reducing the risk of pathogen exposure. 

Status of Stormwater Mapping Project - December 2014:

Status Map-Stormwater Mapping Project (383 KB PDF)

Status of Illicit Discharge Detection and Elimination Project - December 2014:

Illicit Discharge Detection and Elimination Project - Status Map (379 KB PDF)

    

Stormwater Infrastructure Data Availability: 

The geographic information systems stormwater infrastructure data used in these reports is available for download thru the Vermont Center for Geographic Information Systems (http://www.vcgi.org/).  Please note that the VCGI database is updated once per year with data collected in the preceding year so some data illustrated in these reports may not be available thru VCGI.  All data used in these reports is available also from the VTDEC Ecosystem Restoration Section.

Presentation - March 2011:
Presentation: Illicit Discharge Detection and Elimination (IDDE) Project (4.2MB PDF)

Presentation -October 2012:

Vermont IDDE Project-Center for Watershed Protection Stormwater and Watershed Conference (3.97 MB PDF)

Program reports:

August 2001

Characterization of Outfalls on the Winooski River in Montpelier (1.24 MB PDF)

March 2007

Detection and Elimination of Non-Stormwater Discharges to the Streams of the City of Barre (870KB PDF)

March, 2009
City and Town of St. Albans Stormwater Mapping Project (5MB PDF)

July 2009

Detection and Elimination of Non-Stormwater Discharges to the North Branch, Dog River and the Stevens Branch of the Winooski River in Montpelier, Berlin and Northfield (4.2MB PDF)

September, 2009
Missisquoi River Basin Urban Areas: Stormwater Mapping Project (7MB PDF)

October, 2009
Mid-Winooski River Basin Stormwater Mapping Project: Waitsfield, Waterbury, Stowe and Richmond - October 2009 (4.15MB PDF)

August, 2010
Connecticut River Basin Stormwater Mapping Project: St. Johnsbury, Springfield and Brattleboro - August 2010 (6.69MB PDF)

February, 2011
Illicit Discharge Detection and Elimination in Richmond, Waterbury, Moretown, and Waitsfield (3869KB PDF)

March, 2011
Illicit Discharge Detection and Elimination in Six Missisquoi River Basin Communities (3271KB PDF)
Appendices to IDDE in Six Missisquoi River Basin Communities (10.5MB PDF)

January, 2012
Illicit Discharge Detection and Elimination in Brattleboro (6575KB PDF)

February, 2012
Lamoille River Basin Stormwater Mapping Project: Georgia, Underhill, Jericho, Fairfax, Cambridge, Johnson, Hyde Park, Morristown, and Hardwick - February 2012 (10MB PDF)

August, 2012

Otter Creek Basin Stormwater Mapping Project: Vergennes, Middlebury, Brandon, Pittsford, Proctor, Rutland Town, Rutland City and Wallingford-August 2012 (7.7MB PDF)

December, 2012

City and Town of St. Albans Illicit Discharge Detection and Elimination(IDDE) Study (7.7MB PDF)

January, 2013

Town of Springfield Illicit Discharge Detection and Elimination Study (15MB PDF)

April, 2013

Upper Winooski River Basin Stormwater Infrastructure Mapping Project: Barre City, Barre Town, Berlin, Cabot, Marshfield, Plainfield and Williamstown(9.3MB PDF)

Poultney River Basin Stormwater Infrastructure Mapping Project: Benson, Castleton, Fair Haven, Middletown Springs, Poultney (3.5MB PDF)

September, 2013

Assessment of stormwater system outfalls in Marshfield, VT (1.1 MB PDF)

Detection of illicit discharge from stormwater system outfalls in Plainfield, VT (1.4 MB PDF)

Monitoring of stormwater system outfalls in Cabot, VT (850 KB PDF)

March 2014

Detecting and Eliminating Illicit Discharges in Rutland County to Improve Water Quality (Castleton, Fair Haven, Poultney, Proctor, Wallingford and West Rutland) (11MB PDF)

Mid Connecticut River Basin Stormwater Infrastructure Mapping Project:  Bradford, Fairlee, Groton, Ryegate, and Newbury, and Wells River

(2.6MB PDF)

Passumpsic River Basin Stormwater Infrastructure Mapping Project: Burke, Concord, Danville, and Lyndon (2.8MB PDF)

Upper Connecticut River Basin Stormwater Infrastructure Mapping Project: Canaan, Gilman, and Lunenburg  (1.3MB PDF)

Lake Memphremagog Basin: Barton, Black, Clyde, Coaticook, and Tomifobia Stormwater Infrastructure Mapping Project:

Barton, Brighton, Derby, Newport, and Orleans (4.1MB PDF)

May 2014

Otter Creek Basin Illicit Discharge Detection and Elimination Project (10MB PDF)

July 2014

Detecting and Eliminating Illicit Discharges to Improve Water Quality in the Lamoille River Basin (10MB PDF)

 

October 2014

Missisquoi River Basin & St. Albans City & Town Advanced Illicit Discharge Detection and Elimination Study (1.2MB PDF)

Appendix A (2.8MB PDF)

Appendix B (10MB PDF)

Appendix C-H (5.6MB PDF)

 

 

Revised: Nov., 2014

www.watershedmanagement.vt.gov

VT DEC Watershed Management Division 1 National Life Drive, Main 2  Montpelier, VT  05620-3522  Tele: 802-828-1535   Fax: 802-828-1544

 

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