This spreadsheet uses raw data from outfall screening and from instream baseflow sampling to make an initial determination of flow sources (e.g., wastewater, tap water), calculate nutrient loads for each outfall and compare pollutant loads from outfalls to baseflow within the stream itself.

This section contains field forms for the Outfall Reconnaissance Inventory (ORI), a protocol for field screening of stormwater outfalls to identify illicit discharges, as well as an ORI Sample Collection Lab Sheet to record results of water quality analysis for outfalls evaluated using the ORI.

This comprehensive technical guidance manual outlines practical, low cost, and effective techniques for Phase II NPDES MS4 communities and others seeking to establish Illicit Discharge Detection and Elimination (IDDE) programs and investigate non-stormwater entries into storm drainage systems. The report is accompanied by a set of technical appendices that can be downloaded separately.

When citing this manual, please use the following reference: Brown, E., Caraco, D., and Pitt, R. 2004. Illicit Discharge Detection and Elimination: A Guidance Manual for Program Development and Technical Assessment. Center for Watershed Protection and University of Alabama. EPA X-82907801-0.U.S. EPA Office of Wastewater Management, Washington, D.C.

This mini-guide contains procedures for detecting and tracking illicit discharges through a desktop assessment of illicit discharge potential, field screening of outfalls to detect illicit discharges and drainage area investigations to locate and remove the source of the discharge.

Seven presentations are available here for training local staff and watershed groups about illicit discharge detection and elimination (IDDE) activities. These presentations were developed for a May 2011 workshop conducted for MS4s in the Wissahickon Watershed in Southeastern Pennsylvania. Topics include: IDDE Introduction / Terminology / Phase II Requirements, Building Up Your Local Program, Indicator Monitoring, Desktop Analysis of Illicit Discharge Potential, Preparing for Field Investigations, Isolating and Fixing Illicit Discharges, and Pollution Prevention.

This section houses links to two short videos on illicit discharge detection and elimination (IDDE), posted on YouTube. The first one is a 4.5-minute video can be used to educate elected officials and new program staff about illicit discharge detection and elimination. The second one is a 1.5-minute video intended to educate the general public about illicit discharges.