Which of the following statements is true regarding the factors that influence septic system performance?

Soil properties directly affect absorption rates, making this statement true. The effectiveness of a septic system largely depends on the characteristics of the soil where it's installed. Different types of soil have varying textures, structures, and permeabilities, all of which influence how well wastewater can be absorbed and filtered through the ground. For example, sandy soils can drain quickly but may not retain nutrients well, while clay soils can retain water but may slow down absorption rates. This interaction between the soil properties and the septic system is critical in ensuring proper treatment and preventing system failure or contamination of the surrounding environment.

The other statements lack accuracy regarding the essential factors influencing septic system performance. Soil type is fundamentally vital to the operation of the system. Likewise, neighborhood population density can significantly impact the volume of wastewater generated and consequently affect the system’s performance. Lastly, septic systems rely on proper soil to function effectively; without it, the systems would be prone to failure and would not properly treat the wastewater.