Under the US EPA Safe Drinking Water Act regulations, the monthly BAC-T sampling frequency is based on which factor?

• A. Population served
• B. Water temperature
• C. System size
• D. Distance to source

Answer: (A)

The main idea is that monthly BAC-T sampling frequency is set by how many people depend on the water system. In EPA rules, the number of samples you must collect each month grows with the size of the population served because larger systems have more distribution zones and more potential points where contamination could occur. More customers means a greater need to monitor water quality frequently enough to detect issues quickly and protect public health. Water temperature, distance to the source, or other factors don’t determine the monthly sampling cadence in the same regulatory sense. Small systems may have fewer required samples, while larger systems require more, with the exact counts defined by population-based categories in the monitoring rules.