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

A non-community water system is defined as a water supply system that provides water to the public but is not a part of a residential community, meaning it doesn't serve year-round residents. In this case, an RV park qualifies as a non-community water system because it provides water on a transient basis to visitors, who may only stay temporarily. This makes it distinct from a community water system, which serves a stable residential population.

City water supplies and municipal waste facilities typically cater to established, permanent populations or specific functions for communities, making them community systems or related to municipal processes. An industrial water system generally serves specific industries and is not available to the public, again distinguishing it from the definition of a non-community system. Therefore, the RV park stands out as the correct example of a non-community water system.