Technical Report

Industrial Stormwater Monitoring and Sampling Guide

Published on April 15, 2026
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Produced by the U.S. Environmental Protection Agency, this technical guide (updated 2021) provides step-by-step instructions for industrial facility operators on conducting visual and analytical monitoring of stormwater discharges. It helps permittees and environmental compliance staff implement National Pollutant Discharge Elimination System (NPDES) monitoring requirements, including sampling methods, inspection procedures, and data interpretation to support permit compliance and pollution prevention.

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