Where should backflow devices be located to ensure proper functionality?

Backflow devices are designed to prevent the reverse flow of contaminated water into the potable water supply, ensuring the safety and quality of drinking water. The ideal location for backflow devices is on the customer's side of the service connection to the water main. This placement is crucial because it allows for effective monitoring and control of any potential contaminants that could enter the public water supply due to backflow events.

When backflow devices are installed on the customer side, they provide a barrier between the potable water system and any potential sources of contamination within the private plumbing of the customer. This includes situations where pressure drops in the public system could potentially suck water back into the system from less clean sources.

Positioning backflow devices at this location ensures that any backflow is contained within the customer’s plumbing, thus protecting the integrity of the municipal water supply. Conversely, installing backflow devices on the city's main water supply or in treatment plants would not adequately protect against contaminants that could enter the supply from individual customer systems, nor would placing them near fire hydrants provide the necessary protection needed to safeguard drinking water.

This strategic positioning is mandated by many plumbing codes and regulations, emphasizing its importance in water distribution and public health.