Venting a septic tank is essential to ensure proper airflow and prevent potential odours. It involves incorporating both a low level vent and a high level vent in the system.
The low level vent is placed after the septic tank, treatment plant, or cesspool. It allows air to be drawn in from the surrounding area. The high level vent is located at the inflow point and serves as an outlet for the air.
Depending on the site conditions, you may have spinning cowls, one-way valves, or fans integrated into the ventilation system to promote airflow. In areas with good wind flow, natural ventilation is often sufficient. However, in enclosed spaces, additional measures may be needed to encourage airflow.
For modern developments with internal soil stacks, it’s beneficial to include an external high level vent that extends above the roof or another suitable location, such as a shed or garage.
By incorporating both low level and high level vents, a septic tank can be properly vented, allowing for the flow of air and preventing any potential odour issues.
