What should be the primary concern of backflow prevention devices?

The primary concern of backflow prevention devices is preventing contamination. These devices are specifically designed to protect the potable water supply from contamination that can occur when there is a reversal of flow in the plumbing system. This reversal can happen due to changes in water pressure or the creation of a vacuum, allowing potentially harmful substances from non-potable sources (like irrigation systems, industrial processes, or other hazardous environments) to flow back into the clean water supply.

By ensuring that water flows in only one direction and preventing backflow, these devices play a crucial role in safeguarding public health and ensuring that the water distributed remains safe for consumption. The integrity of the drinking water supply depends heavily on effective backflow prevention, so it is considered the most critical function of these devices in water distribution systems.