What concern arises when flooding occurs and a septic tank is not buried?

When flooding occurs and a septic tank is not buried, the concern primarily revolves around the potential for the tank to float. This phenomenon occurs due to the buoyancy created by the surrounding water. A septic tank that is not adequately secured can become dislodged and rise to the surface, which can lead to a number of issues.

For instance, if the tank floats to the surface, it may cause structural damage to itself, the plumbing connections, and the drain field. Additionally, the tank could become a hazard to people and animals if it breaks free and disrupts the surrounding area.

Certainly, while contamination of nearby wells, blocking of drainage systems, and damage to the septic system are valid concerns related to flooding, the specific issue when the septic tank is not buried is primarily its tendency to float due to the water pressure exerted from flooding.