What type of potential cross connection hazard would a garden hose connected to a chemical dispenser create?

• A. backsiphonage
• B. backpressure
• C. backflow
• D. siphonage

Answer: (A)

Cross-connection hazards occur when a potable water line could allow contaminants to flow backward into the distribution system. A garden hose connected to a chemical dispenser creates a path for water to be drawn back into the supply if the line pressure drops. This reverse flow is backsiphonage—the negative pressure on the supply side pulls water (and whatever is in the hose, like chemicals) back into the system. Backflow is the broader idea of any reverse flow, but the precise mechanism here is backsiphonage, caused by a drop in supply pressure rather than downstream pushing water back. Siphonage is a general term for siphoning action, but the scenario specifically describes backsiphonage due to negative pressure on the supply side. To prevent this, use backflow prevention devices (such as a vacuum breaker) on hoses and ensure proper cross-connection control.