Which situation constitutes a cross connection hazard?

A cross connection hazard refers to a point in a plumbing system where potable water could potentially be contaminated through backflow from non-potable sources. Option B describes a facility with potential backflow risks due to activities on-site, which is a clear example of a cross connection hazard. Such activities may include the use of chemicals, industrial processes, or other situations where contaminants could enter the drinking water supply if backflow were to occur.

Understanding this risk is crucial for water operators, as it highlights the need for proper backflow prevention measures to protect public health. Facilities that handle hazardous materials or have methods of allowing water to flow backward into the system can create serious health threats if not properly managed.

In contrast, the other options do not present a significant cross connection risk. A water supply used for industrial purposes (the first option) may not necessarily imply any contamination hazard if properly regulated. A public water supply with no known contamination (the third option) does not represent a cross connection hazard, as there is no risk of contaminants entering the system. Finally, a community water system serving only residential areas (the fourth option) typically has fewer opportunities for cross connections if the plumbing systems are properly maintained and monitored. Thus, option B stands out as the correct