What is the maximum number of single compartment sinks that a single trap may serve?

The correct option is based on plumbing code regulations, which typically state that a single trap is allowed to serve a maximum of three single compartment sinks. This regulation is designed to ensure that the plumbing system can effectively handle the flow and drainage from the sinks without causing issues such as clogs or inadequate drainage.

The limit helps to maintain proper venting and drainage efficiency, thereby minimizing the risk of water backup or sewer gas entering the living spaces. Each sink can independently produce wastewater, and if too many sinks drain into a single trap, it could overwhelm the system, leading to potential failures. Understanding these guidelines is essential for maintaining an efficient and compliant plumbing system.