Which factor is NOT typically associated with water treatment processes?

The presence of chlorine is a crucial element in water treatment processes, as it is widely used as a disinfectant to kill harmful microorganisms and ensure water safety for public consumption. System pressure is also essential, as it helps in the effective distribution of treated water throughout the supply system. Stray electrical currents may be a concern in some water treatment facilities due to their potential effects on equipment and water quality, but they are not part of the standard treatment processes.

Soil type, on the other hand, is typically associated with groundwater systems and may influence the characteristics of aquifers or the quality of water derived from them. However, within the context of water treatment processes specifically, soil type is not a direct factor because it relates more to the source of the water and its natural filtration before it even enters the treatment process. Thus, it is not regularly considered when examining the treatment itself, making this the correct choice in response to the question.