What is the major risk associated with improper venting of potable water tanks?

The major risk associated with improper venting of potable water tanks is the backflow of contaminants. When potable water tanks are not properly vented, it can create negative pressure within the tank. This negative pressure can lead to the siphoning of water from adjacent systems or sources, potentially drawing in contaminants from outside the tank or from other plumbing systems. Such contamination poses significant health risks, as it compromises the safety of the drinking water.

Proper venting is essential to maintain equal pressure and prevent backflow, ensuring that the potable water remains clean and safe for consumption. This risk is particularly critical in systems that may not have adequate backflow prevention mechanisms, making it imperative to adhere to proper venting practices to safeguard potable water quality.