USGS Water-Quality Information
Water Quality Data
Today's Water Conditions
Get continuous real-time water-quality measurements from Water-Quality Watch maps.
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
USGS in Your Area
USGS Water Science Centers are located in each state.
The Water Mission Area of the U.S. Geological Survey (USGS) provides reliable, impartial, and timely information to understand and manage the Nation's water resources. Inherent in this mission is the responsibility to collect data that accurately describe the physical, chemical, and biological attributes of water systems. These data are used for environmental and resource assessments by the USGS, other government agencies and scientific organizations, and the general public. Reliable and quality-assured data are essential to the credibility and impartiality of the water-resources appraisals carried out by the USGS. The development of the “National Field Manual for the Collection of Water-Quality Data” (NFM) achieves consistency in the scientific methods and procedures that are used, documents those methods and procedures, and maintains technical expertise. USGS field personnel use this manual to ensure that the data they collect are of the high quality required to fulfill our mission.