What is a key feature of a septic tank?

A key feature of a septic tank is that it must be watertight and structurally sound. This characteristic is crucial because the primary function of a septic tank is to collect and treat wastewater from a home or building. A watertight design prevents leaks that can contaminate groundwater and surrounding soil, which is essential for protecting public health and the environment. Additionally, structural soundness ensures the tank can withstand the pressures of the surrounding soil and the weight of water and waste contained within, reducing the risk of collapse and other structural failures over time.

While it is important for septic tanks to hold sewage for varying periods, they cannot do so indefinitely without maintenance, which is why that choice does not accurately represent a key feature. Furthermore, septic tanks do not need to have a capacity double that of traditional toilets, nor are they made solely from plastic; they can be constructed from various materials, including concrete and fiberglass. Therefore, the focus on watertightness and structural integrity is critical for effective and safe operation.