Which pipe system is used specifically for transporting wastewater from various sources to treatment facilities?

The wastewater collection system is specifically designed to transport wastewater from various sources, such as residential, commercial, and industrial facilities, to treatment plants where it can be processed and treated. This system typically includes a network of pipes, pumps, and lift stations that ensure effective flow management, preventing blockages or backups.

While the sanitary sewer does transport wastewater, it is a component of the broader wastewater collection system. The sanitary sewer focuses specifically on carrying domestic sewage and sometimes includes certain industrial wastewater that is treated separately from stormwater. The other two options, stormwater collection systems and combined sewers, serve different purposes. The stormwater system is meant for collecting rainwater and surface runoff, whereas combined sewers are designed to transport both stormwater and wastewater in a single pipe, which can lead to overflow during heavy rains.

Thus, the wastewater collection system encompasses the sanitary sewer and any additional infrastructure needed to manage the full range of wastewater flows, making it the most appropriate choice for this question.