A Health Advisory is a US EPA document that provides guidance and information on contaminants that can affect human health and that may occur in drinking water.

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Other /More definition:
A Health Advisory is an EPA document that provides guidance and information on contaminants that can affect human health and that may occur in drinking water, but which EPA does not currently regulate in drinking water.

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Other /More definition:
A Health Advisory is an EPA document that provides guidance and information on contaminants that can affect human health and that may occur in drinking water, but which EPA does not currently regulate in drinking water.