Final answer:
The material cleaned from a septic tank is called sludge, not seepage; thus, the correct answer is False.
Step-by-step explanation:
The material cleaned from a septic tank is called sludge, not seepage. Therefore, the statement in the question is false. Septic tanks are a crucial part of individual sewage treatment systems, particularly in rural areas without centralized sewer systems. The tanks are designed to collect and break down organic solids with the help of microorganisms. The sludge that settles at the bottom of the septic tank is periodically removed and treated separately, often through a process known as sludge digestion. This process can involve bacterial action, which may produce methane. It is also important to note that if the septic system malfunctions, it can lead to significant water pollution issues.