When minimum lot size cannot be met, who must design the system?

The correct response recognizes the necessity for a specialized design when a minimum lot size cannot be adhered to for an on-site sewage facility. A Professional Engineer or Professional Sanitarian is qualified to address the complexities involved in designing a system that can accommodate the specific conditions of a smaller lot.

These professionals possess the technical expertise and knowledge of local regulations, soil conditions, and system capabilities to design effective and safe sewage systems under non-standard conditions. Their involvement ensures that the sewage system will function properly, preventing potential health risks and environmental contamination that could arise from inadequate system design.

The other options, while relevant to different aspects of construction and public health, do not possess the same level of specialized training and certification required to design a sewage system when the typical parameters such as lot size cannot be met.