Which type of plumbing fixture would require a cross-connection assessment?

Cross-connection assessments are particularly critical for irrigation systems because these systems are often connected to the public water supply and can potentially introduce contaminants if not properly managed. In the context of plumbing safety, a cross-connection occurs when there is an unprotected connection between a drinking water supply and a non-potable source, allowing for the potential backflow of contaminated water into the potable water system.

Irrigation systems frequently use water drawn from various sources, which may include water that has been treated with fertilizers, pesticides, or other chemicals. If there is a drop in water pressure or if the irrigation system malfunctions, there is a risk of these substances entering the municipal water supply. Therefore, local codes typically require a backflow prevention device to be installed on these systems, and regular assessments of cross-connections are necessary to ensure they meet safety standards.

In contrast, while toilets, sinks, and faucets can have cross-connection risks, they typically integrate built-in backflow prevention mechanisms through their design, and they are usually subject to different safety regulations compared to irrigation systems. Thus, the assessment for cross-connections is especially emphasized for irrigation systems to safeguard the quality of the potable water supply.