An International Collaboratory for Sewage (IC Sewage) has been established as a part of the International Water Association's Health-Related Water Microbiology Specialist Group. The overall mission of IC Sewage is to advance our understanding of the impact of wastewater on water quality and health worldwide. As a part of this collaboration, the group is working on developing a tool box to be used for microbial source tracking (MST) to characterize, quantify and map human fecal pollution in waters across the globe. We hope to assist in obtaining high resolution data that will further decision-making for improving the quality of the water environment and human health.