Which of the following is an example of a community water system?

A community water system is defined as a public water system that supplies water to the same population year-round. This typically includes municipal water systems that serve an entire community or a specific area.

Municipal utility districts are a prime example of community water systems because they operate under public governance to provide essential services, including drinking water, to residents within a defined geographical area. These districts are specifically designed to ensure that the water needs of the community are met efficiently and safely, following regulatory standards.

In contrast, the other options do not represent community water systems. Industrial factories primarily focus on their water needs for production and do not serve the general public. Private residences may individually source their water through wells or private systems, which do not qualify as a community system because they do not serve a wide population. Water supply trucking services typically provide water transport rather than a stationary, community-focused supply system. Thus, municipal utility districts stand out as the fitting example of a community water system.