Which types of public water systems are required to comply with Article 6, Capacity Development Requirements?

The correct answer focuses on the specific types of public water systems that the Capacity Development Requirements apply to, which are community water systems and nontransient non-community water systems.

Community water systems serve a population year-round, typically supplying water to at least 15 service connections or 25 residents. This system's consistent service highlights the importance of capacity development to ensure long-term sustainability, quality service, and regulatory compliance.

Nontransient non-community water systems serve the same 25 or more of the same people for at least six months a year, such as schools or factories. These systems also require a robust capacity development strategy to ensure they can meet the water demands and comply with health standards set by regulatory agencies.

In contrast, transient water systems, such as those serving travelers or transient populations, and other options like private wells and industrial systems, do not generally fall under the same capacity development mandates. Therefore, focusing on community and nontransient non-community systems illustrates the targeted approach toward maintaining water quality and infrastructure in more stable and consistent service areas.