How many repeat samples must be taken within 24 hours if a routine coliform sample is positive?

In a scenario where a routine coliform sample tests positive, regulatory standards require the collection of additional samples to assess the water quality and safety. Specifically, four repeat samples must be taken within 24 hours of the initial positive result. This approach is critical because it helps to determine whether the contamination is a one-time event or part of a broader issue with the water system. The collection of multiple samples allows for a more accurate assessment, as it is essential to follow up on potential contamination promptly. The results from these repeat samples will inform necessary actions, such as further testing, remediation, or public health notifications, to ensure the safety and reliability of the water supply. Collecting fewer than four samples may not provide sufficient data to accurately address the source or extent of contamination.