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USGS Water-Quality Information

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 [Photo: USGS scientist collects water-quality samples.]

USGS scientists deploy SPMD and POCIS samplers to collect waterborne contaminants in Manoa Stream on Oahu, Hawaii.


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Water Quality Data

Today's Water Conditions

Get continuous real-time water-quality measurements from Water-Quality Watch maps.
[Sample Water-Quality Watch Map]

Water Quality Portal (WQP)

Get current and historical USGS and EPA water-quality data at the WQP.


Get stream ecosystem aquatic bioassessment data from BioData.

For More Data

View a complete list of USGS water-quality data resources.

USGS Water Science Areas

USGS in Your Area

USGS Water Science Centers are located in each state.

 [Map: There is a USGS Water Science Center office in each State.] Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii and Pacific Islands New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Water-Quality Data

Timely delivery of reliable water-quality data to the public is a mission of the USGS. Data from USGS database systems are available to the public from thousands of sites across the Nation in all 50 states and territories.

On this page you will find links to:

USGS Water-Quality Data

Water Quality Portal

The Water Quality Portal (WQP) is a cooperative service sponsored by USGS, U.S. Environmental Protection Agency (EPA), and National Water Quality Monitoring Council that integrates publicly available water-quality data from the USGS National Water Information System (NWIS) database and the EPA STOrage and RETrieval (STORET) data warehouse.

WaterQuality Watch

[Sample Water-Quality Watch Map]

Water-Quality Watch displays real-time water quality data collected remotely by sensors installed in rivers, lakes, and other water bodies. Readings taken every 5 to 60 minutes are transmitted via satellite to the USGS National Water Information System (NWIS). Current conditions can be displayed on a map, table, or as a time series graph. Data include water temperature, pH, specific conductance, turbidity, dissolved oxygen, and (or) nitrate depending on the site.

USGS Online Water-Quality Data

 [Image: Sample graph.]

NWIS-Web is the general online interface to the USGS National Water Information System (NWIS) database. Discrete water-sample and time-series data from 1.5 million sites in all 50 States. Results from 5 million water samples with 90 million water-quality results are available from a wide variety of retrieval methods including standard and customized map interfaces.

BioData: Aquatic Bioassessment Data

Screenshot of BioData web site

The USGS BioData Retrieval system provides access to results from more than 15,000 macroinvertebrate, algae, and fish community samples from more than 2,000 sites nationwide.

Water Quality of Rivers and Streams

The rivers and streams water quality web site presents interactive annual graphical summaries of streamflow information and nutrient and sediment concentrations and loads from 102 surface-water streams in the National Fixed Site Network (NFSN). Users can compare recent and long-term water quality conditions, download data, evaluate nutrient loading to coastal areas, and more.

USGS Water Data Mobile Notifications

USGS WaterAlert sends email or text messages when certain time-series measurements at USGS sites exceed user-definable thresholds. Links to WaterAlert also are provided from graphs in NWIS-Web.

Water Now enables users to send an email or text message with a USGS site number to and quickly receive a reply with the most recent measurement.

National Water-Quality Assessment

The National Water-Quality Assessment (NAWQA) Data Warehouse is a collection of chemical, biological, and physical water quality data used in the NAWQA Program, drawn partly from NWIS and BioData.

Hydrologic Benchmark Network

 [Image: Sample graph of stream temperature.]

The Hydrologic Benchmark Network (HBN) program collects data from a long-term network of sites located in areas that are minimally affected by human activities. Links are provided to access water-quality data from individual network sites in NWIS.

National Atmospheric Deposition Program

 [Map: National Trends Network sites]

The National Atmospheric Deposition Program (NADP) monitors wet atmospheric deposition at over 250 sites throughout the Nation. The USGS is the lead federal agency for the monitoring of chemical constituents deposited from the atmosphere via rain, sleet, and snow, also known as wet atmospheric deposition.

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Additional USGS Water-Resources Data

Water Data Discovery

The Water Data Discovery web site provides an overview of all USGS water-resources data.

Water-Quality Data by State

USGS Water Science Centers located across the United States may have additional information or resources for local water-quality data. Visit your local USGS Water Science Center web site for more information.

Suspended-Sediment Database

The Suspended-Sediment Database provided daily values of suspended sediment and ancillary data through September 30, 1996. (More current data are included in NWIS.)

USGS Water Data Web Services & XML

USGS provides machine-readable water data through automated web services.

Water Resources Maps and GIS Information

The Maps and GIS page provides a list of partial water-resources GIS resources.

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Other Sources of Water-Quality and Related Data

Government Data

International Water-Quality Data Resources

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Page Contact Information: USGS Office of Water Quality
Page Last Modified: Wednesday, 28-Dec-2016 18:43:48 EST