What triggers a Level 1 assessment under the Revised Total Coliform Rule (RTCR)?

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A Level 1 assessment under the Revised Total Coliform Rule (RTCR) is initiated when there are significant indicators of potential contamination in the water supply. Specifically, having two or more total coliform (TC+) samples in a month when sampling 40 or fewer triggers this assessment. This situation raises concerns about the water quality and the potential presence of harmful pathogens. The RTCR is aimed at ensuring safe drinking water, and such occurrences suggest that there might be a breach in the system that needs to be investigated.

The other options do not meet the criteria for a Level 1 assessment. For example, collecting 30 samples with no TC+ indicates a stable and safe water quality rather than a cause for concern. Maintaining all samples as TC- for a year reflects consistent good performance, and a failed inspection may warrant other actions, but it does not directly trigger a Level 1 assessment as defined by the RTCR. Thus, having two or more TC+ samples in a single month is directly linked to the need for further investigation to ensure public health and safety.

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