What kind of maintenance practice can prevent cross-connections in plumbing?

The installation of one-way valves is a crucial maintenance practice for preventing cross-connections in plumbing systems. Cross-connections occur when there is a potential for contaminated water to flow back into the clean water supply, which can lead to serious health hazards. One-way valves, also known as check valves, are designed to allow fluid to flow in only one direction, effectively preventing any backflow that could result from changes in water pressure or other disturbances in the system. This mechanism ensures that potable (drinkable) water remains separate from non-potable sources, thereby maintaining the safety and integrity of the water supply.

While regular inspections, the use of pressure gauges, and frequent flushing of systems are all valuable maintenance practices, they do not have the same direct effect on mitigating the risk of cross-connections as one-way valves do. Inspections can identify potential issues, pressure gauges measure system performance, and flushing may help clear out contaminants, but it is the functionality of the one-way valve that actively prevents backflow and ensures that safe water does not mix with contaminated sources.