Below is EPA Region 10's guidance for NPDES permitting, monitoring, and enforcement of water quality-based effluent limits set below the analytical detection/quantitation limit. This guidance is for effluent limits that are greater than zero but less than the minimum level (ML).You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
Guidance on Water Quality-Based Effluent Limits Set Below Analytical Detection/Quantitation Limits (PDF)(3 pp, 188 K,
April 25, 2005)
EPA Region 10 NPDES Permit Program.