Successful potable reuse systems require effective pretreatment and source control programs that address residential, commercial, and industrial flows entering the wastewater collection system. Source control programs aim to keep difficult-to-treat or otherwise problematic contaminants from entering the collection system. Industrial dischargers may present significant risks due to the types of chemical contaminants used in industrial processes, the potential for variability in discharge quality, and the higher point source flows relative to residential and commercial users. This project advanced the understanding and practice of source control by addressing two questions: (1) What are the risks of industrial contaminants to potable reuse systems, and which industries frequently discharge these contaminants? and (2) What are the best practices and strategies to help mitigate these risks? The research culminated in a step-by-step framework that will help agencies develop enhanced source control programs for potable reuse systems. Research Partner: California State Water Resources Control Board. Published in 2023.