If an initial sample is positive for total coliforms and a repeat sample is positive for fecal coliform or E. coli, notice to the public must be given within how many hours?

If an initial sample is positive for total coliforms and a repeat sample is positive for fecal coliform or E. coli, notice to the public must be given within how many hours?

• A. 24 hours
• B. 48 hours
• C. 72 hours
• D. 14 days

Answer: (A)

When there’s evidence of fecal contamination in a drinking water system, the public must be informed very quickly. Total coliforms alone point to possible contamination, but finding fecal coliforms or E. coli in a repeat sample confirms a true contamination event with potential health risks. To protect the public, regulations require a Tier 1 public notice within 24 hours of the positive repeat result. The other timeframes (48 hours, 72 hours, or 14 days) are not acceptable for this level of contamination signaling; they are used for less urgent or different categories of notices. So, the required notice window is 24 hours.

When there’s evidence of fecal contamination in a drinking water system, the public must be informed very quickly. Total coliforms alone point to possible contamination, but finding fecal coliforms or E. coli in a repeat sample confirms a true contamination event with potential health risks. To protect the public, regulations require a Tier 1 public notice within 24 hours of the positive repeat result. The other timeframes (48 hours, 72 hours, or 14 days) are not acceptable for this level of contamination signaling; they are used for less urgent or different categories of notices. So, the required notice window is 24 hours.