USGS Water-Quality Information
USGS personnel collect a water-quality sample on the Missouri River. USGS/Photo by Kelly Brady.
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 the 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.
The National Field Manual for the Collection of Water-Quality Data (National Field Manual) is comprised of nine chapters that provide guidelines and standard procedures for U.S. Geological Survey (USGS) personnel who collect data used to assess the quality of the Nation's surface-water and groundwater resources. This chapter of the National Field Manual includes guidelines for the determination of biochemical oxygen demand (using a 5-day bioassay test), fecal indicator bacteria, fecal indicator viruses (coliphages), protozoan pathogens, algal biomass, and cyanobacterial toxin and taste-and-odor compounds in lakes and reservoirs.
Conversion factors, References, and Appendix (1.2MB PDF) [Note: References for sections 7.4 and 7.5 are included in those sections, not in this final section.]
U.S. Geological Survey, variously dated, Biological indicators: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chap. A7, accessed __list date__, from http://pubs.water.usgs.gov/twri9A/.
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For more information
Chapter A7 Archives