Georgia Septic Installer Practice Test

Where should the hole in the compartment wall be installed in a septic tank?

1. At the bottom of the tank

2. Between 25% and 50% of the liquid depth

3. Between 50% and 75% of the liquid depth

4. At the surface of the liquid

The correct answer is: Between 50% and 75% of the liquid depth

The correct choice indicates that the hole in the compartment wall of a septic tank should be positioned between 50% and 75% of the liquid depth. This placement is important for several reasons. Primarily, situating the hole at this level helps facilitate the passing of treated effluent from one compartment to the next while ensuring that the liquid remains at adequate levels for effective treatment processes. The area above this point can contain a significant amount of floating scum, while the area below is generally where sludge accumulates. By positioning the hole between 50% and 75% of liquid depth, it allows for the movement of liquid effluent that has undergone a degree of treatment while minimizing the disturbance of both scum and sludge layers that can negatively impact the function of the septic system and cause contamination risks. In contrast, placing the hole at the bottom of the tank could lead to the transfer of solid materials and sludge, impairing the performance of the system. Similarly, positioning it too low or at the surface could create issues with scum layer plumes or inadequate effluent quality being conveyed to the next compartment. Thus, the recommended placement provides a balance that supports the appropriate operational dynamics of the septic system.