#ndt Sewer systems have been around in one form or another for thousands of years. As technology advanced, pipeline materials have changed, improving durability and functionality. With all the developments over time, most utilities have to contend with multiple pipeline materials, each of which has different maintenance concerns and a different lifespan.

Early sewer systems

Interior of Brick SewerThe first sewer pipes were constructed of brick and mortar in the Indus Valley in 2500 BC. Some of
Source: NDT