National Water Information System (NWIS)

Added By Infochimps
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.

Additional facts available on

Dataset Summary

  • Date Released: 7/1/2001
  • Date Updated: Data is continuously updated – contains near real-time data
  • Time Period: 1861 to present day
  • Data Category Type: Raw Data Catalog
  • Frequency: varies – from one-time collection to every 15 minutes depending on purpose and collection site
  • Specialized Data Category Designation: Surveillance

Contributing Agency Information

Miscellaneous Facts


Public Domain (Government Work)

This dataset was prepared by the government and is therefore in the public domain. There are no restrictions upon its use.