Found 1558 datasets matching filters. (clear all filters)
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage...
Search relevance: 1.00 | Views last month: 79 | Catalog Last Checked: May 05, 2026 at 08:51 PM -
The High Resolution National Hydrography Dataset Plus (NHDPlus HR) is an integrated datset of geospatial data layers, including the most current National Hydrography Dataset (NHD),...
Search relevance: 1.00 | Views last month: 76 | Catalog Last Checked: May 05, 2026 at 08:23 PM -
The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam, American...
Search relevance: 1.00 | Views last month: 67 | Catalog Last Checked: May 05, 2026 at 08:58 PM -
This GIS dataset contains data on wastewater treatment plants, based on EPA's Facility Registry Service (FRS) and NPDES, along with Clean Watersheds Needs Survey (CWNS) and other data sources.
Search relevance: 1.00 | Views last month: 65 | Catalog Last Checked: May 06, 2026 at 12:30 AM -
This dataset shows the temporal frequency and spatial extent of cyanobacteria cells in large, freshwater lakes and reservoirs across the continental United States derived from 300x300 meter MEdium...
Search relevance: 1.00 | Views last month: 56 | Catalog Last Checked: May 06, 2026 at 12:02 AM -
This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands...
Search relevance: 1.00 | Views last month: 54 | Catalog Last Checked: August 08, 2025 at 12:34 PM -
This part of the data release contains the raster representation of the groundwater-level altitude and groundwater-level change maps developed every 5 years from 1980 to 2015 for the upper Rio...
Search relevance: 1.00 | Views last month: 50 | Catalog Last Checked: May 05, 2026 at 09:23 PM -
The California Water Quality Status Report is an annual data-driven snapshot of the Water Board’s water quality and ecosystem data. This third edition of the report is organized around the...
Search relevance: 1.00 | Views last month: 44 | Catalog Last Checked: July 29, 2025 at 02:35 AM -
The Great Lakes Environmental Database (GLENDA) houses environmental data collected by EPA Great Lakes National Program Office (GLNPO) programs that sample water, aquatic life, sediments, and air...
Search relevance: 1.00 | Views last month: 42 | Catalog Last Checked: May 01, 2026 at 06:08 PM -
This digital dataset contains the name and location for the inflows to the surface-water network for the Central Valley Hydrologic Model (CVHM). The Central Valley encompasses an approximate...
Search relevance: 1.00 | Views last month: 37 | Catalog Last Checked: May 05, 2026 at 09:59 PM -
This U.S. Geological Survey data release contains datasets that combine past data with future projections of nitrogen sources and nitrogen export to the Chesapeake Bay watershed for the years...
Search relevance: 1.00 | Views last month: 35 | Catalog Last Checked: May 05, 2026 at 08:22 PM -
This Data Release contains various types of hydrologic and geologic data from the Upper Rio Grande Focus Area Study from 1921-2017, including groundwater-level measurement data compiled and...
Search relevance: 1.00 | Views last month: 33 | Catalog Last Checked: May 05, 2026 at 08:37 PM -
This data set is a compilation of data from two sampling efforts (2010 and 2014), focused on determining the presence and distribution of organic contaminants throughout the United States portion...
Search relevance: 1.00 | Views last month: 31 | Catalog Last Checked: May 05, 2026 at 08:18 PM -
ECHO provides integrated compliance and enforcement information for about 800,000 regulated facilities nationwide. Its features range from simple to advanced, catering to users who want to conduct...
Search relevance: 1.00 | Views last month: 31 | Catalog Last Checked: May 14, 2026 at 09:45 PM -
This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands...
Search relevance: 1.00 | Views last month: 29 | Catalog Last Checked: May 05, 2026 at 10:34 PM -
Vertical electrical soundings (VES) are used to develop depth-resolved models of aquifer resistivity by making electrical potential measurements at increasingly larger electrode spacing, with the...
Search relevance: 1.00 | Views last month: 28 | Catalog Last Checked: May 05, 2026 at 08:37 PM -
This digital dataset contains the monthly inflows to the surface water network in the updated Central Valley Hydrologic Model (CVHM2) for water years 1922-2019. The surface water inflows are...
Search relevance: 1.00 | Views last month: 27 | Catalog Last Checked: May 05, 2026 at 08:30 PM -
This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This web service includes layers depicting EnviroAtlas...
Search relevance: 1.00 | Views last month: 20 | Catalog Last Checked: May 06, 2026 at 12:11 AM -
This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This EnviroAtlas dataset describes the percentage of a 15-m...
Search relevance: 1.00 | Views last month: 20 | Catalog Last Checked: May 06, 2026 at 12:20 AM -
The project provides information that can be used in preliminary land use-based risk assessments for pesticides potentially used in the St. Johns River watershed, and for a broad suite of...
Search relevance: 1.00 | Views last month: 19 | Catalog Last Checked: May 10, 2026 at 03:26 AM
