True or False: The invert of the septic tank inlet must be at least 2 inches higher than the outlet invert.

The statement is true because having the invert of the septic tank inlet at least 2 inches higher than the outlet invert is crucial for the proper functioning of the septic system. This design ensures that gravity flow can adequately move wastewater from the inlet to the outlet, allowing for effective treatment and preventing potential backflow issues. This slope is essential for maintaining the necessary hydraulic gradient that drives wastewater through the tank and into the drain field for further treatment.

Maintaining this height difference helps reduce the risk of solids accumulating and causing blockages, which could lead to system failure or environmental contamination. As such, this requirement is a standard practice in septic system installation and design, ensuring reliable operation and compliance with regulations.