What defines a community water system?

A community water system is specifically defined as a public water system that serves at least 15 service connections or regularly serves at least 25 individuals year-round. This definition ensures that the water system is operated for the continual supply of safe drinking water to a stable group of consumers, which is essential for public health. The requirement of 15 service connections ensures that the system can effectively support a community and adhere to regulations governing water quality and safety.

Thus, the answer is correct because it aligns with the established criteria that define community water systems and reflect the larger principles of providing consistent and reliable water service to a defined population.