Which environmental factor does NOT affect a septic system’s efficiency?

User consumption habits do not directly affect the efficiency of a septic system in the same way that environmental factors do. The function of a septic system relies heavily on the interaction between the system and its surrounding environment, including how well the soil can absorb and filter wastewater, the groundwater levels that can influence drainage, and the impact of weather conditions on soil saturation and system performance.

In contrast, user consumption habits pertain more to the volume and type of waste that enters the system rather than how the system interacts with its environment. While they can affect the overall volume of wastewater processed, they do not change the intrinsic characteristics of the septic system or the environmental conditions that it operates within. This makes user consumption habits less relevant when considering the factors that impact the operational efficiency of the system itself.