Here's a Forbes blog which points out that I-131 can be a radiation source at waste treatment plants.
His information comes from a study in the latest Health Physics Journal (I haven't received that issue yet).
The blog states that:
"The measured I-131 peaked at the euiqvlent (sic) of 3.68 millisieverts per year, which is slightly higher than the estimated dose Americans receive from background radiation."
The annual dose (an estimate, the activity concentration is measured) is pretty high for a member of the general public (I doubt those water treatment plant workers have the training and dosimeters to be considered occupational workers).
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