Illinois Plumbing Code Practice

The prohibition of a direct cross-connection with non-potable sources in residential areas under the Illinois Plumbing Code is rooted in the need to maintain a safe and uncontaminated water supply for households. Non-potable sources, such as irrigation systems, industrial water, or other untreated sources, pose a significant risk of backflow into the potable water system. Such cross-connections can lead to the contamination of drinking water, which is critical for public health.

To mitigate this risk, the Illinois Plumbing Code emphasizes strict regulations regarding cross-connections to ensure that potable water remains safe from potential contaminants. This regulation is crucial because residential areas rely on clean water for consumption, cooking, and hygiene. Therefore, any direct cross-connection with non-potable sources is deemed unacceptable.

In contrast, other options such as a direct cross-connection with potable sources, a timer-controlled water supply system, or a hose bib with a vacuum breaker do not inherently pose the same level of risk to the safety of the drinking water. Timer-controlled systems can be managed effectively without risk, and vacuum breakers are specifically designed to prevent backflow, thereby protecting potable water systems.