USGS National Water Information System

USGS National Water Information System
Name	National Water Information System
Jurisdiction	United States
Parent agency	United States Geological Survey
Formed	1990s
Headquarters	Reston, Virginia

USGS National Water Information System is the centralized database and data-distribution framework operated by the United States Geological Survey for hydrologic data across the United States and its territories. It integrates streamflow, groundwater, water quality, and water-use observations into a unified system designed to support scientific research, resource management, and public safety. The system underpins operational monitoring used by agencies such as the Federal Emergency Management Agency, National Oceanic and Atmospheric Administration, and state water-resources departments.

Overview

The National Water Information System (NWIS) aggregates time-series and discrete measurements from networks maintained by the United States Geological Survey and partner entities including state geological surveys, municipal utilities, and federal entities like the Bureau of Reclamation and Environmental Protection Agency. NWIS serves as the authoritative source for streamgages that inform National Weather Service flood forecasts, supports groundwater investigations coordinated with the U.S. Army Corps of Engineers, and archives long-term datasets cited in reports by the Intergovernmental Panel on Climate Change and the National Academies of Sciences, Engineering, and Medicine. The system evolved from legacy databases into a web-enabled platform to facilitate interoperability with initiatives such as the National Hydrologic Warning Council and the Integrated Ocean Observing System.

Data Types and Networks

NWIS maintains diverse hydrologic data categories: continuous streamflow records from streamgages on rivers like the Mississippi River and Colorado River, groundwater-level observations from wells across aquifers such as the Ogallala Aquifer, and water-quality samples for analytes regulated under the Clean Water Act. The system includes specialized networks for surface-water sediment monitoring used in studies related to the Missouri River sediment management, and nutrient-monitoring programs relevant to the Chesapeake Bay and Gulf of Mexico hypoxia assessments. NWIS also catalogs water-use compilations connected to the U.S. Census Bureau and energy-sector withdrawals related to facilities tracked by the Energy Information Administration.

Data Collection and Methodology

Field data collection follows standardized protocols developed by the United States Geological Survey in coordination with partners such as the Association of State Floodplain Managers and the American Water Works Association. Streamflow measurements employ stage-discharge relations derived from current-meter measurements and acoustic Doppler current profilers used in work on rivers like the Columbia River and Sacramento River. Groundwater monitoring uses nested well networks and transducers for continuous records, applied in regional studies of the San Joaquin Valley subsidence and Floridan Aquifer recharge. Water-quality sampling applies chain-of-custody procedures and laboratory analyses aligned with methods endorsed by the Environmental Protection Agency and the United States Pharmacopeia for trace-organic and inorganic constituents. Geospatial positioning for station locations integrates Global Positioning System observations consistent with standards from the National Geodetic Survey.

Data Access and Tools

NWIS provides public access through web interfaces, web services, and downloadable APIs used by researchers at institutions like the United States Geological Survey Earthquake Science Center and universities such as Stanford University, University of California, Berkeley, and Colorado State University. Tools include interactive mapping compatible with the National Map and data retrieval services that interoperate with the HydroShare data-sharing platform and the Open Geospatial Consortium standards. Real-time telemetry leverages telemetry providers and follows communication protocols used by the National Telecommunications and Information Administration. Data export supports formats adopted by the Federal Geographic Data Committee and is routinely used in modeling systems such as the Soil and Water Assessment Tool and MODFLOW groundwater models.

Applications and Uses

NWIS data inform flood forecasting and emergency response coordinated with the Federal Emergency Management Agency and National Weather Service river forecasts, support dam-safety assessments for infrastructure managed by the Bureau of Reclamation and the Army Corps of Engineers, and underpin water-allocation decisions involving interstate compacts such as the Colorado River Compact. Researchers use NWIS records to study long-term hydrologic trends referenced in reports by the National Oceanic and Atmospheric Administration and the National Academies of Sciences, Engineering, and Medicine, while state agencies use the data for permitting and compliance under the Safe Drinking Water Act and the Clean Water Act. Municipal planners and utilities in metropolitan areas like New York City, Los Angeles, and Chicago integrate NWIS outputs into resilience planning and infrastructure investment analyses.

Governance and Partnerships

NWIS governance is led by the United States Geological Survey with cooperative agreements involving state geological surveys, tribal authorities, and federal partners including the Environmental Protection Agency, Bureau of Reclamation, and National Oceanic and Atmospheric Administration. Partnerships extend to academic consortia such as the Consortium of Universities for the Advancement of Hydrologic Science, Inc. and professional societies including the American Geophysical Union and the Society of Environmental Toxicology and Chemistry. Funding and policy oversight intersect with legislation and programs administered by the United States Congress and executive branch agencies that set priorities for national hydrologic monitoring and data-sharing initiatives.

Category:Hydrology Category:United States Geological Survey