If a radionuclide is above the MCL in finished water, how often must sampling be done and for how long?

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Multiple Choice

If a radionuclide is above the MCL in finished water, how often must sampling be done and for how long?

Explanation:
When a radionuclide in finished drinking water exceeds the MCL, the monitoring approach shifts to verify whether the exceedance is temporary or persistent. The requirement is to collect samples quarterly (every three months) for a full year and use those results to calculate the running annual average (RAA), which is the average of the most recent four quarterly samples. You continue sampling quarterly until that running annual average falls below the MCL. Once the RAA is below the MCL, you can typically revert to less frequent, usually annual, sampling. This approach helps ensure that a single outlier isn’t treated as a violation and confirms sustained compliance before reducing sampling frequency.

When a radionuclide in finished drinking water exceeds the MCL, the monitoring approach shifts to verify whether the exceedance is temporary or persistent. The requirement is to collect samples quarterly (every three months) for a full year and use those results to calculate the running annual average (RAA), which is the average of the most recent four quarterly samples. You continue sampling quarterly until that running annual average falls below the MCL. Once the RAA is below the MCL, you can typically revert to less frequent, usually annual, sampling. This approach helps ensure that a single outlier isn’t treated as a violation and confirms sustained compliance before reducing sampling frequency.

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