Noteworthy

 Featured Local Science: California Water Science Center - Pesticides flowing into the Salton Sea

 USGS investigations of national and regional trends in ground-water quality [30KB PDF]

Water Quality Data

National Water Information System (NWIS)

• NWIS provides current and historical water-quality data.

Today's Water Conditions

• Water-Quality Watch provides continuous real-time water-quality measurements.

Water-Quality Web Services

• Web services automate sharing of USGS and USEPA water-quality monitoring data.

For More Data

• Additional water-quality data resources are available.

USGS in Your Area

USGS Water Science Centers are located in each state.

Field Methods & Techniques

Stream Tracer Studies

• Standard Methods for Stream Tracer Injection Studies
  A list of publications of USGS standard methods for stream tracer injection studies.
• Rhodamine WT Reader
  Readings on the reactivity and transport characteristics of the Rhodamine WT tracer.
• Bromide Stream Tracer Reference List
  A reference list for the use of bromide as a stream tracer.
• Transient Storage Reader 1
  Essential references for starting an application of the transient storage concept of stream/hyporhiec solute transport.
• Transient Storage Reader 2
  A comprehensive reading list on the transient storage concept and related hyporheic zone processes.

Other Methods

• National Environmental Methods Index
• Instant Unit Conversions
  (interactive conversions, made available by the Institute of Chemistry, Freie Universitaet, Berlin, Germany).
• Microbial detection and source-tracking methods
• Continuous Water-Quality Monitors