In a single-family dwelling, which two common cross-connections should be monitored?

In a single-family dwelling, monitoring hose connections and ballcocks is crucial due to their potential to create cross-connections between the potable water supply and non-potable sources. A hose connection often does not have an adequate backflow prevention device, which can lead to contamination of the drinking water supply when a hose is submerged in contaminated water, such as in a pool or during lawn watering. Ballcocks, commonly found in toilets and other fixtures, can also create a situation where water could flow backward into the potable supply if there is a drop in pressure, thereby introducing contaminants.

Effective monitoring and protection against such cross-connections help ensure that the drinking water remains safe and free from pollutants or pathogens, supporting public health and safety in the community. It is essential for water operators to be aware of these particular connections and to implement backflow prevention strategies as part of a comprehensive water quality management program.