During a sanitary survey, which phase involves interviewing those in charge of the system and observing all major components from sources to distribution lines?

• A. Pre-Survey
• B. Post-Survey
• C. On-Site Survey
• D. Administrative Review

Answer: (C)

The hands-on, field-based evaluation is being tested here. The phase that involves interviewing those in charge of the system and observing all major components from sources to distribution lines is the on-site survey. In this step, you talk with operators and managers to understand how the system actually runs, maintenance practices, source protection, treatment, disinfection, storage, and distribution. At the same time, you walk through the physical assets—source intakes or wells, treatment facilities, storage tanks, pumping stations, and the distribution network—to verify conditions, operation, and to spot vulnerabilities such as unprotected sources, bypassed treatment, leaks, backflow risks, or other infrastructure issues. Pre-survey is about gathering data and planning, while administrative review and post-survey focus on documenting findings and follow-up after fieldwork.