Georgia Septic Installer Practice Test

What is the minimum freeboard required for precast septic tanks?

1. 6 inches

2. 9 inches

3. 12 inches

4. 15 inches

The correct answer is: 9 inches

The minimum freeboard required for precast septic tanks is typically specified as 9 inches to ensure safety and functionality. Freeboard refers to the vertical distance from the top of the liquid level to the top of the tank, which serves several important purposes. Having a 9-inch freeboard helps prevent overflow during heavy rainfall or excessive water usage, minimizing the risk of surface water contamination. It also provides a buffer to accommodate any potential surge from sudden inflows or rapid water movement within the tank. This specification is crucial for ensuring that the septic system operates effectively and remains within design parameters, enhancing its longevity and performance over time. The choice of 9 inches reflects standard practices in septic system installation to meet health and safety regulations.