CDPH Water Distribution Grade 2 Test 2025 – 400 Free Practice Questions to Pass the Exam

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How many coliform samples are required per month for a water system serving a population between 25 and 100?

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For a water system serving a population between 25 and 100, the regulatory guidelines stipulate that a minimum of one coliform sample must be collected each month. This standard is in place to ensure adequate monitoring of water quality and safety for smaller populations. The rationale behind this requirement is to balance the need for public health protection with the practical aspects of sampling for smaller systems, where resources and demands may not be as extensive as for larger populations.

In contrast, larger systems would require more frequent sampling to reflect the increased risk and variability associated with a greater number of consumers. Therefore, the requirement for monthly sampling of one coliform sample for this size population effectively meets the necessary public health objectives while taking into account the scale of the water system being monitored.

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