Community systems are defined by which characteristic?

The characteristic that defines community systems is that they serve a population of 25 or more. This threshold is significant because it distinguishes community water systems, for example, from other types of systems that may not qualify under specific regulatory definitions. The 25-person minimum ensures that the system is established for a stable and identifiable community, which might include residents of a neighborhood, small towns, or other settled groups.

Systems serving fewer than 25 people are typically classified as non-community systems or may be categorized differently, such as transient systems where user populations fluctuate. By setting a standard population size of 25, regulations and guidelines can be effectively applied, focusing on ensuring the safety and reliability of water and waste systems that affect a broader community. This distinction is crucial in environmental health for monitoring public health risks, managing resources, or implementing public health policies.