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Use this query to find a method approved for regulatory use
Select an analyte:
 
Specify regulation: National Pollutant Discharge Elimination System
National Primary Drinking Water Regulations
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NOTE: All analytes in drop-down are listed in a regulatory method but NOT NECESSARILY in all regulations. Therefore, a return of zero methods indicates that information for the analyte you selected is currently not in the NEMI database for the regulation you selected. In that event, either select another analyte or a different regulation.
Environmental Laws and Regulations -- Background on Water Quality Laws and Regulations