What is the primary concern regarding overflow in a Holding Tank Sewage System?

The primary concern regarding overflow in a Holding Tank Sewage System focuses on avoiding backup into the building’s fixtures. This is crucial because if a holding tank overflows, it can cause sewage to backup into toilets, sinks, and other fixtures, leading to unsanitary conditions and potential health hazards. Backup can also damage plumbing systems and create a hazardous environment for occupants.

In a properly functioning system, the tank is designed to hold sewage until it can be pumped out safely, preventing overflow and ensuring proper flow through the plumbing. Thus, monitoring the tank's capacity and ensuring it does not reach a point where it causes backup into fixtures is essential for maintaining the system's integrity and protecting the health of those using the facility.