Nationally, bacteria is the leading impairment, especially for urban streams. Bacteria TMDLs are widespread, and it is challenging to track the sources of these impairments. Illicit Discharge Detection and Elimination (IDDE) is one of the six minimum measures for MS4s. Programs around the country are exploring methods to retool IDDE programs to monitor for, detect, and track bacteria sources. This webcast put on by the Center for Watershed Protection featured common-sense and economical approaches for IDDE-based bacteria monitoring, featuring several successful case studies.