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Quality assessed and modified Discharge Monitoring Report (DMR) facility and outfall locations, 2007 - 2019

December 6, 2021

Each year the U.S. Environmental Protection Agency (EPA) reports permit, location, and discharge information for facilities across the United States and its territories through the Discharge Monitoring Report (DMR). Because these data are cataloged through a variety of systems, including self-reporting, there are discrepancies that may lead to incorrect spatial interpretation of content in the database. The processing of this quality assessed and modified dataset included steps to evaluate the accuracy and potential limitations of DMR data between 2007 and 2019. Attributes within this tabular dataset include facility and outfall locations as well as confidence ratings for those locations, and hydrologic unit code (HUC) 12 information on outfalls above a certain threshold of confidence. Discretion should be used when utilizing this dataset and users should ensure an understanding of the metadata or content in the DMR_ReadMe.docx file.