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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 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.

Photos of flooding and USGS activities.

USGS Water-Quality Sampling of Flood Waters

Please note: this page highlights USGS water-quality sampling related to flooding. For all USGS flooding activites, see the main USGS floods page.

Overview: USGS Water-Quality Activities During Flooding

When flooding happens, USGS field crews are among the first to respond. During and after storms and floods, USGS field crews measure the streamflow and height of rivers to ensure the accuracy and reliable operation of streamgages.

Flooding can affect the quality of our Nation's water resources. The USGS responds to major events that can affect water quality by working with local, State, and Federal agencies and the citizenry to identify, quantify, and understand environmental issues and concerns. During and after flooding events, USGS may collect additional water samples to help us understand how flooding is affecting water quality in the short- and long-term. The frequency and location of water sampling varies by flood event and depends on the needs and concerns of our Cooperators and local communities.

2015 Activities

2012 Activities

2011 Activities

For more information:

USGS WaterWatch current flood conditions map map legend

The USGS WaterWatch ( web site displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States. The real-time information generally is updated on an hourly basis.

USGS Flood Monitoring and Data Collection

For additional information on USGS flood monitoring and data collection activities, see USGS national flood activities web site, with links to USGS Water Science Centers, data, maps, multimedia, and more.

For more information on USGS water-quality sampling, contact the USGS Office of Water Quality.

To learn more about USGS water-quality sampling methods and protocols, see:

Flooding and Water-Quality Health and Safety Information

Every effort should be made to limit contact with flood water due to potentially elevated levels of contamination associated with raw sewage and other hazardous substances.

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Page Contact Information: USGS Office of Water Quality
Page Last Modified: Wednesday, 28-Dec-2016 18:54:54 EST