Georgia Septic Installer Practice Test

When tanks are placed in series, what should be the liquid capacity of the first tank?

1. 500 gallons

2. 800 gallons

3. 1000 gallons

4. 1250 gallons

The correct answer is: 1000 gallons

When tanks are installed in series, the liquid capacity of the first tank is critical because it serves as the primary stage in the process of wastewater treatment. The first tank must have an adequate capacity to allow for proper settling of solids and providing sufficient retention time for the wastewater. A capacity of 1000 gallons is often considered a standard in the industry, as it ensures there is enough space for decanting and processing a significant volume of wastewater effectively. Having a tank with this capacity helps prevent overload, allows for adequate anaerobic digestion to occur, and minimizes the risk of solids overflowing into subsequent tanks. This is important for maintaining system functionality and extending the life of the entire septic system. Additionally, state regulations often prescribe minimum sizes to ensure compliance with safety and efficiency standards, and a 1000-gallon capacity aligns with these guidelines for typical residential applications.