If you failed a micro test, what is one of the requirements for resampling?

When a micro test fails, the requirement to resample at the failed location is crucial for accurately identifying the source of contamination or issues that may have led to the failure. Resampling at the exact spot allows for a direct comparison with the initial results and helps determine whether the problem persists or if it was an anomaly. This process is vital in ensuring that the water quality and safety standards are maintained, as it enables operators to take necessary corrective actions more effectively.

Choosing to resample any location, only downstream, or further than 5 connections would not provide the direct evidence needed to address the initial failure. The goal of targeted resampling is to obtain reliable data that can lead to specific insights and risk mitigation, which is why sampling at the failed site is the most appropriate and effective protocol.