Which of the following is NOT a requirement for the pump vault?

A pump vault is an essential component of a septic system, serving as the housing for the pump that moves wastewater from the septic tank to the drain field. The requirements for a pump vault are crucial to ensure its effective operation and longevity.

Being watertight is vital because it prevents the entry of groundwater into the system, which could dilute the effluent being pumped and potentially lead to system failures. The ability to resist chemical corrosion is equally important, as septic systems deal with various substances that can degrade materials over time. Constructing the vault with durable materials ensures it can withstand the pressures and environmental factors associated with septic system operation.

Having a decorative design, while it may be aesthetically pleasing, does not impact the functionality or performance of the pump vault. Therefore, it is not a requirement for the pump vault in the context of septic system design and operation, making it the correct answer in this scenario.