Which of the following is a best practice for septic tank maintenance?

Pumping the septic tank at least once every five years is a best practice for maintenance because it helps to prevent system failures and ensures proper functionality. Over time, solid waste accumulates in the tank, and if left unattended, the tank can become full. When this occurs, solids can overflow into the drain field, leading to clogs, backups, and potentially costly repairs. Regular pumping allows for the effective removal of these solids, maintaining the balance of the system and prolonging its lifespan.

In addition to pumping, routine inspections should also be part of a comprehensive maintenance plan, as they can help identify potential issues before they escalate. While other options may seem effective in certain contexts, they do not prioritize the fundamental necessity of regular pumping, which is crucial for the longevity and efficiency of a septic system. Proper maintenance not only promotes the health of the system but also protects the environment and public health.