Which term describes the system that transports wastewater from the source to the treatment plant?

• A. Collection system
• B. Treatment facility
• C. Distribution network
• D. Sewer network

Answer: (A)

The main idea is recognizing the network that moves wastewater from where it’s produced to where it’s treated. That system is the collection system. It includes the building sewer and service lines from each property, the trunk sewers and mains, and any pumping stations or rise-to-pump segments that help convey wastewater toward the treatment plant. Gravity flow is common, but pumps are used when needed to maintain movement toward the plant.

This differs from a treatment facility, which is the actual plant where the wastewater is cleaned through physical, chemical, and biological processes. It also differs from a distribution network, which is oriented toward delivering something to users (typically potable water) rather than collecting and transporting wastewater. A sewer network is a term that can describe the same general idea, but the standard terminology in wastewater practice is collection system, emphasizing its role in gathering and conveying wastewater to treatment.