NASSCO’s commitment to ensure the continued acceptance and growth of trenchless technologies is supported by an understanding of how far sewage conveyance systems have come. Learning about sewer system development and evolution creates a deep appreciation for those who came before us and worked hard to provide effective sanitary systems to communities throughout history.Over the past 20-plus years, Jon Schladweiler, the historian of the Arizona Water Association, has researched, collected and archived sanitary sewer system materials. Dating from approximately 3500 B.C. through the 1930s A.D., this dynamic collection of materials demonstrates the evolution of sewers over the past 5,500 years,
