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Information on sole source aquifers (SSAs) is widely used in assessments under the National Environmental Policy Act and at the state and local level. A national layer, including all available SSA...
Search relevance: 1.00 | Views last month: 96 | Catalog Last Checked: August 03, 2026 at 05:00 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: 89 | Catalog Last Checked: August 03, 2026 at 04:16 AM -
The Safe Drinking Water Information System (SDWIS) contains information about public water systems and their violations of EPA's drinking water regulations.
Search relevance: 1.00 | Views last month: 77 | Catalog Last Checked: August 01, 2026 at 03:30 AM -
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: 74 | Catalog Last Checked: August 03, 2026 at 04:45 AM -
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: 67 | Catalog Last Checked: August 03, 2026 at 04:43 AM -
This downloadable data package consists of location and facility identification information from EPA's Facility Registry Service (FRS) for all sites that are available in the FRS individual...
Search relevance: 1.00 | Views last month: 35 | Catalog Last Checked: August 03, 2026 at 04:42 AM -
The is a curated dataset of information for all public water systems (PWS) in California, including the name, location and some general informaiton for each PWS. The source of the data...
Search relevance: 1.00 | Views last month: 32 | Catalog Last Checked: July 31, 2026 at 08:48 PM -
This dataset contains the results of EPAs estimates for domestic water supply in The United States for 2020 census blocks. The file is a comma-delimited text file, which contains records for 2020...
Search relevance: 1.00 | Views last month: 30 | Catalog Last Checked: August 03, 2026 at 12:50 AM -
This web feature service consists of location and facility identification information from EPA's Facility Registry Service (FRS) for the subset of sites that link to the Assessment Cleanup and...
Search relevance: 1.00 | Views last month: 28 | Catalog Last Checked: August 03, 2026 at 04:42 AM -
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: 24 | Catalog Last Checked: August 03, 2026 at 04:43 AM -
SDWIS/FED is EPA's national regulatory compliance database for the drinking water program. It includes information on the nation's 160,000 public water systems and violations of drinking water...
Search relevance: 1.00 | Views last month: 23 | Catalog Last Checked: August 01, 2026 at 03:30 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 objective of this research was to predict nutrient, chlorophyll-a, and associated harmful algal bloom, hypoxia, and eutrophication effects in US lakes. This research used nutrient and...
Search relevance: 1.00 | Views last month: 20 | Catalog Last Checked: August 03, 2026 at 12:50 AM -
This web feature service contains location and facility identification information from EPA's Facility Registry Service (FRS) for the subset of facilities that link to the Toxic Release Inventory...
Search relevance: 1.00 | Views last month: 18 | Catalog Last Checked: August 03, 2026 at 04:42 AM -
This data provides location and attribute information on Facilities regulated under the Superfund Enterprise Management System (SEMS). The Superfund Enterprise Management System (SEMS) integrates...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: August 03, 2026 at 04:42 AM -
National Primary Drinking Water Regulations (NPDWRs or primary standards) are legally enforceable standards that apply to public water systems. Primary standards protect public health by limiting...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: August 01, 2026 at 03:30 AM -
The Division of Drinking Water requires laboratories to submit water quality data directly. The data is received, and published twice monthly on the Division's water quality portal. The resource...
Search relevance: 1.00 | Views last month: 14 | Catalog Last Checked: July 31, 2026 at 08:53 PM -
This web feature service contains location and facility identification information from EPA's Facility Registry Service (FRS) for the subset of Hazardous Waste Treatment, Storage, and Disposal...
Search relevance: 1.00 | Views last month: 14 | Catalog Last Checked: August 03, 2026 at 04:42 AM -
A database where EPA has compiled data on public drinking water systems and whether they have certain drinking water violations. This data is collected by the states and given to the EPA. This...
Search relevance: 1.00 | Views last month: 13 | Catalog Last Checked: August 03, 2026 at 12:43 AM -
This web feature service contains location and facility identification information from EPA's Facility Registry Service (FRS) for the subset of facilities that link to the Integrated Compliance...
Search relevance: 1.00 | Views last month: 12 | Catalog Last Checked: August 03, 2026 at 04:42 AM
