What requirements for any public water system are dependent upon the regulations of the state?

• A. Treatment
• B. Disinfection
• C. Source water protection
• D. Distribution infrastructure

Answer: (A)

The main idea being tested is how state regulations shape what a public water system must do in practice, especially for treatment. While federal rules set broad safety goals, the specific treatment steps and performance criteria are determined by the state to fit local water sources and contaminant conditions. This is why treatment requirements are state-dependent: the state tailors which processes (like how water is filtered or what treatment technologies are required) and how rigorous the treatment must be to reliably remove local contaminants and ensure safety. Disinfection, source water protection, and distribution infrastructure are guided by federal mandates or broader programs, and while states implement them, the treatment side is most directly governed by state regulations.