This webinar focuses on single event/other violations on the quarterly National Pollutant Discharge Elimination System (NPDES) Noncompliance Report (NNCR), which provides a comprehensive list of Clean Water Act violations and their resolutions to the public. The training focuses on when single event/other violations are generated, criteria for assigning Category I versus II noncompliance, resolution of single event/other violations, and a demonstration of searching and filtering single event/other violations on the quarterly NNCR. This training is an advanced training and assumes you have attended or watched a recording of the quarterly NNCR training before attending (https://echo.epa.gov/help/training#Series).