What is a potential cause of septic-tank failure?

Septic-tank failure can be attributed to multiple factors, and each of the reasons listed contributes to this issue. Routine cleaning of the septic tank is essential to remove accumulated sludge and scum that can inhibit the tank's function. Without regular maintenance, the system can become overloaded, leading to failures in treating wastewater.

Leaking plumbing fixtures can introduce excess water into the system, overwhelming the tank and the associated absorption field. This can prevent proper treatment of wastewater and lead to premature system failure.

Improper design and construction of the absorption system can result in inadequate drainage and treatment of effluent. If the absorption area is not appropriately sized, constructed, or located, it can lead to backups and system failures.

Therefore, all these factors are potential causes of septic-tank failure, making the comprehensive answer the most accurate choice. Each component plays a critical role in ensuring the septic system functions effectively, and neglecting any one of these aspects can lead to significant issues.