Which of the following is a key step to prevent recontamination of stored drinking water?

Separating clean and dirty water containers is a crucial step in preventing the recontamination of stored drinking water. This practice ensures that there is a clear physical separation between water that is safe for consumption and water that may be contaminated. If clean and dirty containers are mixed or stored together, it increases the risk of transferring pathogens or pollutants from contaminated water to drinking water.

By maintaining distinct areas or distinct containers for clean and dirty water, the risk of cross-contamination is significantly reduced, thereby protecting public health and ensuring that the stored water remains safe for drinking. This step is fundamental in water management practices, especially in community settings where the sources of water may vary in quality.

Other options, such as mixing water frequently, using open containers, or avoiding disinfection, do not contribute positively to maintaining the safety of stored drinking water. Each of these practices could potentially lead to higher risks of contamination. Thus, the practice of keeping clean and dirty water separate stands out as a vital measure in maintaining water quality.