Who is responsible for preventing contamination of the public water system by backflow?

The responsibility for preventing contamination of the public water system by backflow primarily lies with the water supplier. This role involves ensuring that the infrastructure of the water distribution system is designed and maintained to prevent backflow, which could allow pollutants and contaminants to enter the potable water supply. Water suppliers implement various measures, such as installing backflow prevention devices in critical locations, conducting regular inspections, and adhering to regulatory standards to safeguard public health.

While property owners have a role in maintaining their internal plumbing systems and ensuring that any backflow prevention devices they install are working correctly, the overarching responsibility for the public water system falls to the water supplier. Local health departments may monitor compliance and provide guidelines, while maintenance teams work under the direction of the water supplier to implement the necessary systems and inspections. However, the ultimate responsibility for protecting the integrity of the public water supply from contamination rests with the water supplier.