What is the purpose of the check valve in a septic system?

The purpose of the check valve in a septic system is to prevent backflow. This device serves as a critical component in maintaining the proper functioning of the septic system by ensuring that wastewater flows in only one direction—from the home to the septic tank and then to the drain field. By doing so, the check valve protects the system from potential flow reversals that could cause contamination of the clean water supply and disrupt the treatment process.

Additionally, in certain configurations, if a blockage occurs downstream, without a check valve, wastewater could flow back into the home, leading to sewage backups that pose health risks and damage property. By preventing this backflow, the check valve helps maintain the integrity and efficiency of the septic system, ensuring that it operates safely and effectively over time.