What defines a Community Water System (CWS)?

A Community Water System (CWS) is defined by its ability to provide water to a group of people on a continuous basis. Specifically, it must serve at least 25 individuals year-round. This definition is important because it establishes the minimum threshold of users and the commitment to provide consistent water services, which create the need for specific regulatory oversight and operational standards to ensure the safety and quality of the water delivered.

The other options do not fit this definition. Seasonal systems may provide water but do not cater to a year-round population. Large-scale agricultural irrigation systems focus on agricultural needs rather than community-based water supply. A private well serving an individual does not meet the criteria for a community system, as it does not provide water to a community of 25 people or more. Thus, the recognition of a CWS is critical for establishing regulations and ensuring public health and safety in water supply systems.