Memorandum of Understanding between the USGS and EPA for the cooperative maintenance and enhancement of the National Hydrography Dataset, the National Hydrography Dataset Plus and the Watershed Boundary Dataset.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- MOU for NHDPlus for USGS and EPA (PDF)(9 pp, 2 MB, 12/04/19)