At a minimum, how close can a sanitary sewage system be placed from a basement?

The correct answer of 15 feet is based on public health considerations and regulations regarding the placement of sanitary sewage systems in relation to structures like basements. This distance is significant in preventing contamination and ensuring that any potential leaks or system failures do not pose a risk to the health of occupants inside the building.

Maintaining a distance of at least 15 feet from a basement helps to minimize the risk of sewer gases or infiltrated wastewater compromising indoor air quality or the structural integrity of the building. This regulation supports the goal of protecting human health and the environment by ensuring proper separation between sewage systems and living spaces, which is crucial for preventing issues related to dampness, odors, and contamination.

The alternatives suggested for distances that are either less than or exceed 15 feet do not align with the best practices established for maintaining sanitary conditions around residential properties. It's important to adhere to these standards to ensure the safety and welfare of residents and the surrounding community.