At what point is the sewer service line connected to a sewer main?

The connection of a sewer service line to a sewer main should ideally occur at the top of the sewer main. This positioning is crucial for proper drainage and to ensure that the flow of wastewater from the service line can enter the sewer main without significant obstruction. When the connection is made at the top, it facilitates gravity flow, allowing the sewage to move downward into the main sewer line effectively.

Connecting at the top of the sewer main also minimizes the risk of sewer gas issues or backflow that can occur if connections are made improperly, such as at the bottom or side, which may lead to blockages or improper flow direction. This ensures efficient waste management and reduces the likelihood of maintenance issues in the future.