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Assuring Compliance when your NPDES Permit Limit is Non-Detect

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National Pollution Discharge Elimination System (NPDES) permit limits and subsequent pretreatment discharge limits for some parameters are now being set at “Non-Detect” in environmentally sensitive watersheds. Will permit holders be able to demonstrate compliance with a “Non-Detect” limit, especially if challenged by the regulator or a third party? Three internationally recognized definitions for detection and quantification will presented; the Critical Level (LC), the Detection Limit (LD) and the Quantification Limit (LQ). We will explore what “Non-Detect” really means and how you can demonstrate compliance when regulatory limits are set below the limit of quantification. Specific case studies will be used to show how statistically defensible limits of detection and quantification can be established. Accurate detection and quantification limits guarantee the environment is adequately protected while ensuring the permit limit can be measured with confidence.

Document Type: Research Article


Publication date: 2002-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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