What is a key requirement for a visual and audible alarm in on-site sewage systems?

A key requirement for a visual and audible alarm in on-site sewage systems is that it must be independently powered from the pump circuit. This ensures that the alarm will function even if there is a power failure or a problem with the pump itself. If the alarm were solely reliant on the pump circuit for power, any issues affecting the pump could also disable the alarm, leading to potentially hazardous situations if there is a system failure. An independently powered alarm provides an added layer of safety and reliability by ensuring that users are alerted promptly to any malfunctions, allowing for timely intervention to prevent system overflow or other critical failures. This requirement is crucial for maintaining the integrity of sewage disposal systems and protecting public health and the environment.