What is a cross-connection control program designed to prevent?

A cross-connection control program is specifically designed to protect the integrity of potable water systems by preventing contamination. This is achieved by identifying and eliminating points of potential cross-connections—situations where non-potable water or contaminants can enter the drinking water supply through backflow. Such a program ensures that harmful substances do not mix with clean water, safeguarding public health and maintaining the safety of the drinking water supply.

Contamination can occur through various means, such as when a hose is submerged in a pool of contaminated water or when there is a sudden pressure drop in the water supply system that allows backflow from non-potable sources. The program often includes measures such as the installation of backflow prevention devices, regular inspections, and public education on the importance of avoiding cross-connections.

Other options, such as water treatment delays, billing discrepancies, and surface water runoff, do not relate directly to the primary focus of a cross-connection control program, which is to maintain the quality of potable water. Thus, option C accurately reflects the central goal of these programs.