What does the Public Water System Identification Number (PWSID) signify?

The Public Water System Identification Number (PWSID) is a unique number specifically assigned to identify public water systems. This identifier serves an essential purpose in managing and regulating public water supplies, ensuring that they meet safety and quality standards as established by government agencies. The PWSID allows for accurate tracking of compliance and monitoring efforts for each public water system, making it vital for both administrative purposes and public health.

In the context of the other options, the correct choice is focused solely on public water supplies, distinguishing it from private wells, which do not have a PWSID and are not subject to the same regulatory framework. Additionally, while water utilities in Indiana might manage multiple systems, the PWSID specifically pertains to public water supplies and does not represent all utilities universally. Moreover, although each water treatment plant may have its own identifiers for operational efficiency, the PWSID is not assigned solely to treatment plants but rather covers entire public water systems.