Water Resources of the United States


National Water Information System

View current and historical streamflow, ground-water level, and water-quality data

Today's Water Conditions

View comparisons of current and historical conditions using maps
Click map to go to current water resources conditions in the U.S.



USGS Water Science Centers are located in each state

Water-Resources Techniques, Methods, and Modeling

Sources for procedures or strategies for research, management, collection, or analysis of scientific information used for water resources.

 Field methods

Procedures for research and instrumental means to measure, collect data and samples, and observe water resources in areas where the materials, phenomena, structures, or species being studied occur.


Use of geophysical methods to quantitatively monitor physical earth processes associated with water resources, such as contaminant transport and ecological and climate investigations.

 Laboratory Methods

Techniques to analyze and test water-resources samples in a place equipped and designed for the work.

  • National Environmental Methods Index— A Web-searchable database to compare water-quality data-collection methods and find the method to meet your needs.
  • Analytical methods for environmental measurements—The Toxic Substances Hydrology program's laboratory methods designed to measure a wide range of environmental properties.
  • USGS National Water Quality Laboratory—A full-service laboratory that specializes in environmental analytical chemistry and has a primary role to develop new methods.
  • Microbiology—Microbiology projects related to water quality that investigate bacteria, viral and protozoan pathogens; links are provided to publications and analytical, field, and laboratory methods.
  • Hydraulics—Office of Surface Water's information relating to the branch of engineering which applies the physical properties of fluids, such as flow and pressure, to the design and use of machinery, pumps, pipelines, etc.
  • Indoor hydraulic laboratory—The Office of Surface Water lab provides links to meter calibrations, current meter performance, and modeling activities.
  • Chemical analysis—Agricultural chemicals.

 Computer models

Availability and use of computer simulation models and statistical analysis software.

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