What can result from inadequate drainage in a plumbing system?

Inadequate drainage in a plumbing system can lead to the accumulation of waste, which poses several significant issues. When the drainage system is not functioning properly, waste materials tend to build up within the pipes rather than being efficiently carried away to the sewer or septic system. This buildup can create blockages, leading to backed-up drains, overflows, and ultimately, potential backflow situations. Backflow occurs when wastewater flows in the opposite direction, possibly allowing contaminated water to enter clean water supply lines, creating health hazards.

Understanding the consequences of inadequate drainage emphasizes the importance of maintaining clear and functional drainage systems. The other options, such as faster pipe installation or increased water pressure, do not directly relate to the issues arising from poor drainage. Similarly, while a clean water supply is essential, inadequate drainage systems can compromise water quality, making that choice incorrect in the context of the question.