What is the purpose of a holding tank in septic systems?

The purpose of a holding tank in septic systems is primarily to temporarily store wastewater in situations where a conventional septic system is not feasible due to specific site conditions. This can include properties with inadequate soil for absorption, high groundwater levels, or physical limitations such as space constraints.

Holding tanks are designed to collect and hold wastewater until it can be transported for proper treatment, typically to a treatment facility or a designated disposal area. They are crucial in areas where traditional septic systems can't function effectively, ensuring that wastewater is managed in a way that protects public health and the environment.

The other options do not correctly describe the function of a holding tank. For instance, holding tanks do not provide permanent storage or treatment of wastewater, nor do they play a role in increasing water pressure within the system. Their main function is focused on temporary storage to manage wastewater until it can be properly treated or disposed of.