A public water system must have at least how many service connections or serve how many persons for a certain number of days to be considered as such?

A public water system must have at least 15 service connections or serve 25 persons for at least 60 days to be classified as such. This definition is critical for regulatory purposes and helps ensure that water systems provide adequate service while still maintaining compliance with health and safety standards.

By having these thresholds, the regulations can effectively distinguish between smaller, potentially more informal water setups and larger systems that require more structured management and oversight. Understanding this classification is essential for water operators, as it determines regulatory requirements, operational standards, and the various compliance measures necessary to ensure safe drinking water for the public.

The other options do not meet the established criteria for defining a public water system as per regulatory standards, hence they are not valid answers.