Which of the following is a factor in determining septic system capacity?

Soil type is a crucial factor in determining septic system capacity because it directly affects how wastewater is absorbed and treated in the soil. Different types of soil have varying capacities for permeability, which is the ability of the soil to transmit water. For instance, sandy soils allow for faster drainage and are generally more effective at treating wastewater, while clay soils tend to retain water and can lead to slower absorption rates, increasing the risk of system failure.

Understanding the soil type at a site informs the design and sizing of the septic system, ensuring it can adequately handle the expected flow of wastewater without causing environmental contamination or system malfunction. This is essential for maintaining both the efficiency of the septic system and the health of the surrounding ecosystem.

While population density, climate, and location can influence the overall planning and installation aspects of septic systems, the specific characteristics of the soil will have the most direct impact on the system's functioning and capacity.