What can happen if a septic tank is pumped during a wet period?

Pumping a septic tank during a wet period can lead to the tank beginning to float due to the buoyant forces acting on it. When the soil around the septic tank is saturated with water, the ground can become less able to support the weight of the tank, especially if the tank was not properly anchored. If water levels rise and the tank is emptied, the external water pressure can exceed the weight of the tank, causing it to rise or "float" out of the ground. This situation not only disrupts the positioning of the tank but can also lead to damage, increased costs for repairs, and additional complications in the septic system's proper functioning.

It is essential to consider soil conditions and water table levels before performing maintenance on a septic system to avoid this potential issue.