Which group is usually responsible for ensuring backflow prevention in public systems?

The responsibility for ensuring backflow prevention in public systems typically falls to local utility companies. These entities manage the water supply and distribution systems within their jurisdiction. They are tasked with implementing measures to protect the drinking water supply from contamination due to backflow, which can occur when the water pressure drops and allows non-potable water to flow back into the system. Local utility companies are equipped with the knowledge and resources to monitor, maintain, and enforce compliance with backflow prevention regulations. This includes installing and testing backflow prevention devices to ensure they function correctly and mitigate any risk of contamination.

While homeowners, state environmental agencies, and private contractors may all play roles in the broader context of water safety and quality, the primary duty of ensuring the integrity of public water systems against backflow issues lies with local utility companies.