10.1021/es101417u.s004 Ryan S. D. Calder Ryan S. D. Calder Ketra A. Schmitt Ketra A. Schmitt Role of Detection Limits in Drinking Water Regulation American Chemical Society 2010 claim drinking water regulation detection analysis Water RegulationSome commentators capability toxicological data United States Environmental Protection Agency approaches SDWA context contaminants 2010-11-01 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Role_of_Detection_Limits_in_Drinking_Water_Regulation/2718088 Some commentators on environmental science and policy have claimed that advances in analytical chemistry, reflected by an ability to detect contaminants at ever-decreasing concentrations, lead to regulations stricter than justified by available toxicological data. We evaluate this claim in the context of drinking water regulation, with respect to contaminants regulated under the Safe Drinking Water Act (SDWA). We examine the relationships between historical and present maximum contaminant levels and goals in the greater context of detection capability and evaluate the extent to which different aspects of the regulatory apparatus (i.e., analytical capability, cost-benefit analysis, analysis of competing risks, and available toxicological data) influence the regulatory process. Our findings do not support the claim that decreases in detection limit lead to more stringent regulation in the context of drinking water regulation in the United States. Further, based on our analysis of the National Primary Drinking Water Regulation and existing United States Environmental Protection Agency approaches to establishing the practical quantifiable level, we conclude that in the absence of changes to the underlying toxicological model, regulatory revision is unlikely.