What is the purpose of a cross-connection program?

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Preventing backflow from contaminating the drinking water system is the main purpose of a cross-connection program. A cross-connection is any link or arrangement where potable water could be exposed to non-potable substances, creating a path for contaminants to flow back into the distribution system when pressure changes occur. Because pressure in the system can fluctuate, even seemingly simple connections—like irrigation lines, boilers, or hose connections—can become a risk if not properly protected.

The program works by identifying potential cross-connections, requiring protective measures, and ensuring those protections are maintained. This often involves inspecting facilities, installing and testing backflow preventers or air gaps, and enforcing requirements so that any dangerous connections are either removed or safeguarded. Education and record-keeping are also part of making sure the protections stay in place.

That focus distinguishes it from other tasks. Inventorying water meters is about tracking usage and infrastructure, not preventing backflow. Monitoring taste and odor relates to water aesthetics, not backflow risk. Regulating chlorine residuals deals with maintaining disinfection levels, which is important but separate from preventing backflow contamination.