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National Water Information System (NWIS)

Dataset Summary

Agency	Department of the Interior
Sub-Agency	US Geological Survey
Category	Geography and Environment
Date Released	7/1/2001
Date Updated	Data is continuously updated - contains near real-time data
Time Period	1861 to present day
Frequency	varies - from one-time collection to every 15 minutes depending on purpose and collection site
Description	NWIS supports the acquisition, processing, storage and dissemination of information about water quantity and quality collected at over 1.5 million sites around the U.S. As a long-term database and information delivery system, NWIS provides continual access to data collected over the last 100+ years, as well as real-time data on streamflow, etc.

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Dataset Metrics

Number of Downloads

1,002

Dataset Information

Data.gov Data Category Type	Raw Data Catalog
Specialized Data Category Designation	Surveillance
Keywords	water resources, water data, ground water, groundwater, surface water, water quality, water chemistry, real-time water data, streamflow, water level, NWIS
Unique ID	96

Contributing Agency Information

Citation	National Water Information System Web, http://waterdata.usgs.gov/nwis/
Agency Program Page	Water Resources http://water.usgs.gov/
Agency Data Series Page	http://water.usgs.gov/data/

Dataset Coverage

Unit of Analysis	measurements, observations and analyses from ground- and surface-water bodies
Granularity	coordinate: latitude, longitude and depth below land surface in some cases like ground water or lakes.
Geographic Coverage	United States and Territories

Data Description

Collection Mode	multiple
Data Collection Instrument	multiple (http://pubs.usgs.gov/twri/)
Data Dictionary/Variable List	http://waterdata.usgs.gov/nwis/help

Additional Dataset Documentation

Technical Documentation	http://waterdata.usgs.gov/nwis/help
Additional Metadata	http://wdr.water.usgs.gov/current/documentation.html and http://water.usgs.gov/a-z/

OMB Control No. 3090-0284