What type of alarm must on-site sewage disposal systems with pumps have?

On-site sewage disposal systems that utilize pumps require an alarm system to alert users of potential issues, such as a pump failure or a high water level in the tank. An audible and visual alarm is essential because it provides immediate and clear notifications through both sound and visual signals, ensuring that any problems can be addressed promptly. This dual alert system is crucial for preventing possible backups or overflows, which could lead to environmental hazards or health risks.

A visual-only alarm may not be sufficient as it could easily go unnoticed, especially if the system is located in a low-traffic area. A manual reset alarm requires the user to be present to reset it after an incident, which can delay response times in critical situations. A silent alarm would not serve the purpose of alerting anyone to the issue, making it ineffective for preventing potential problems with the sewage system. The combination of both audible and visual alerts provides a comprehensive approach to monitoring and maintaining safe operation of the disposal system.