For a city of 15,000 people, the water supplier must take distribution point samples at a frequency of how many?

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Multiple Choice

For a city of 15,000 people, the water supplier must take distribution point samples at a frequency of how many?

The main idea here is that sampling frequency in a distribution system is tied to the population served. To get a representative picture of the system’s microbial quality, regulators use a proportional approach—more people means more distribution-point samples. For a city with 15,000 residents, that typically means about one distribution-point sample per thousand people, yielding roughly fifteen samples in a sampling period. Taking samples across multiple points helps ensure you’d detect localized issues that could escape notice if you only sampled at the plant or at a few locations. This balance aims to reliably monitor the system while keeping costs reasonable; too few samples can miss problems, while too many can be unnecessarily costly.

The main idea here is that sampling frequency in a distribution system is tied to the population served. To get a representative picture of the system’s microbial quality, regulators use a proportional approach—more people means more distribution-point samples. For a city with 15,000 residents, that typically means about one distribution-point sample per thousand people, yielding roughly fifteen samples in a sampling period. Taking samples across multiple points helps ensure you’d detect localized issues that could escape notice if you only sampled at the plant or at a few locations. This balance aims to reliably monitor the system while keeping costs reasonable; too few samples can miss problems, while too many can be unnecessarily costly.

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