Why is it important to monitor the residual levels in water systems?

Monitoring the residual levels in water systems is crucial for ensuring safety and compliance. Residuals, such as chlorine, serve as indicators of water quality and disinfectant effectiveness. Maintaining appropriate residual levels is essential to prevent the growth of harmful pathogens in the water supply, which can lead to health risks for consumers. Additionally, regulatory agencies set compliance standards for residual levels to ensure that drinking water meets safety requirements. By monitoring these levels, utilities can effectively manage water treatment processes, confirm that the disinfection is functioning properly, and take corrective actions if necessary, thus safeguarding public health.

While the other options address important aspects of water system management, they don't directly relate to the primary reason for monitoring residual levels. For instance, determining water pressure and checking for leaks pertain more to hydraulic performance rather than water quality, and increasing flow rates relates to system efficiency rather than safety compliance.