In evaluating a lot for septic tank system design, which of the following must be considered?

When evaluating a lot for septic tank system design, lot size is a crucial factor because it directly influences the type, size, and feasibility of the septic system that can be installed. Adequate lot size ensures there is sufficient space not only for the septic tank and drain field but also for necessary setbacks from property lines, wells, and other structures.

Additionally, a larger lot can provide better options for soil absorption and placement of the septic system, which is vital for effective sewage disposal and minimizing the risk of contamination and system failure.

While neighboring properties, landscaping options, and homeowner preferences are relevant considerations in a broader planning context, they do not hold the same fundamental weight in the technical assessment of the lot's suitability for a septic system. The design must comply with local regulations and be suitable for the physical characteristics of the land, primarily dictated by the lot size.