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

A non-community water system serves water to the public but does not serve the same number of people year-round. Highway rest areas are typically examples of this type of system because they provide water to transient populations rather than a residential community.

These facilities cater to travelers and do not have a fixed user base. In contrast, urban residential areas house established communities, while rural farms primarily utilize private wells or systems dedicated to those specific locations. Public swimming pools, although they may serve various users, are tied to the community or facility that operates them and thus do not fit the non-community classification in the same way as highway rest areas.

Therefore, highway rest areas exemplify a non-community water system as they are designed for intermittent use by a varying population.