The presence of what in the water distribution system can lead to low pressure?

The presence of pipe corrosion and mineral buildup in a water distribution system can significantly contribute to low pressure. As pipes corrode over time, especially if they are made of certain metals that are susceptible to degradation, they can develop rough inner surfaces or even obstructions. This roughness increases friction as water flows through the pipes, making it harder for water to move freely. Similarly, mineral buildup from hard water can accumulate on the inner walls of the pipes, further narrowing the flow path and restricting the amount of water that can pass through. Both corrosion and buildup create a resistance to flow, leading to a reduction in water pressure at the outlets.

In contrast, the other options do not independently lead to low pressure. High-quality plumbing fixtures are designed to maintain steady flow and pressure. Consistent water temperature doesn't impact pressure directly; rather, it may influence the comfort and usage in the system. Efficient water heaters focus on heating water but do not inherently affect the pressure of the water flowing through the distribution system.