Geographic Information System (GIS) tools and technology are becoming increasingly vital to address a variety of work tasks across City operations. Recently, Sr. Industrial Source Control Inspector Duke DeClue and GIS Technician Carola Eklund completed a multi-year project that partnered the two departments in the development of a GIS based Spill Tracing App. Wastewater’s Industrial Source Control Team works to protect the public wastewater collection system, treatment plant, and workers who work in and around the system. The App delivers the necessary information to the Industrial Source Control Team when they respond to different issues in the collection system. The App is usable on both stationary or mobile platforms and generates easy to read maps as well lists of industries that contribute to the area being evaluated. It provides the ability to analyze spill related information to evaluate hazards, locate sources of identified "hot spots" and prioritize response efforts. Development and use of this App is a great tool that helps us further our mission of protecting local health, safety and the environment.