Portable containers for drinking water must be equipped with what?

The requirement for portable containers for drinking water to be equipped with a tight seal is crucial for maintaining the safety and quality of the water. A tight seal helps prevent contamination from external sources such as dust, dirt, insects, and other pollutants that could compromise the water. This is especially important in a construction setting where the environment can be unpredictable and exposure to contaminants is heightened.

Furthermore, ensuring that drinking water is protected from potential contaminants also aligns with OSHA’s regulations aimed at promoting worker health and safety. Inadequate protection can lead to serious health concerns, thus emphasizing the importance of a tight seal on these containers.

While the other options may contribute to the water's quality or distribution, they do not address the fundamental necessity of preventing contamination. For example, while a dispensing faucet may facilitate access, it does not inherently safeguard the water from outside pollutants if the container itself is not properly sealed. Similarly, a filter system and cooling system enhance the quality of the water, but they do not prevent contamination at the source. Hence, the tight seal is the critical component for ensuring that the drinking water remains safe for consumption.