Which type of system can operate without a designated treatment process?

A transient non-community system is a type of water system that serves water to the public but does not have a designated treatment process like a community or public water system typically would. This means that while it provides water, it may not be treated or tested as regularly, reflecting its more casual nature. These systems often serve places like campgrounds, parks, or other temporary venues where people come and go.

In contrast, community and public systems are typically designed with specific treatment processes to ensure the safety and potability of the drinking water, often adhering to regulatory standards. Private well systems are often unregulated by municipal systems, but they generally still require some form of maintenance and monitoring for water quality, even if not managed by a public entity or treatment process.

Thus, the transient non-community system stands out for its operational model, which allows it to function without a structured treatment process, making it unique among the types of water systems discussed.