The USGS and the U.S. Environmental Protection Agency (EPA) each collect vast amounts of water quality data. The U.S. Geological Survey's (USGS) National Water Information System (NWIS) is a comprehensive and distributed application that supports the acquisition, processing, and long-term storage of water data. A jointly developed web service allows you to retrieve data for millions of quality checked water quality samples and results. WaterWatch Map of monthly streamflow compared to historical streamflow for the month of the year (Colorado) References to non-U.S. Department of the Interior (DOI) products do not constitute an endorsement by the DOI. The USGS collects and analyzes chemical, physical, and biological properties of water, sediment and tissue samples from across the Nation. The USGS investigates the occurrence, quantity, quality, distribution, and movement of surface and underground waters and disseminates the data to the public, State and local governments, public and private utilities, and other Federal agencies involved with managing our water resources. The National Water Information System (NWIS) is the USGS water data portal where you can find a wealth of historic and real-time data related to floods. The Water Data for the Nation discrete sample data base is a compilation of over 4.4 million historical water quality analyses in the USGS district data bases through September 2005. Existing tools, features, and web data services are being fully maintained as before, but new tools and enhancements will no longer be developed. Please contact USGS WaterWatch if you have any questions. Find out more at the Water Quality Web Services web site . This is an implementation of the FDSN Event Web Service Specification, and allows custom searches for earthquake information using a variety of parameters. Recording and transmission times may be more frequent during critical events. NOTICE: In January 2020, USGS WaterWatch began operating in maintenance-only mode. Current data typically are recorded at 15- to 60-minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Current data typically are recorded at 15- to 60-minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Existing tools, features, and web data services are being fully maintained as before, but new tools and enhancements will no longer be developed. USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards ... API Documentation - Earthquake Catalog. 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