USGS Water-Quality Information
Autonomous underwater vehicle provides high-resolution observations of water quality and much more. Photo (c) Peter Berrini, HDR, Inc., used by permission.
National & Regional Science:
Local Science Features:
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.
Chapter 5, Version 2.2: Comments, updates, and replacement pages have been added to the pdf file. (To print this file, select Print from the File Menu, and select Document and Markups under the Comments and Forms Heading.) Information in the Comment boxes will be displayed when the file is printed.
These sections of Version 2.2 must be accessed separately:
Section 5.3.2 -- Instructions for Field Use of Spike Solutions for Organic-Analyte Samples (dated 6/2009) [103 KB PDF]
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The National Field Manual for the Collection of Water-Quality Data (National Field Manual) describes protocols and provides guidelines 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 addresses methods to be used in processing water samples to be analyzed for inorganic and organic chemical substances, including the bottling of composite, pumped, and bailed samples and subsamples; sample filtration; solid-phase extraction for pesticide analyses; sample preservation; and sample handling and shipping.
Sections of Chapter A5: Processing of Water Samples
Back of Title Page
Purpose and scope
Requirements and recommendations
Field manual review and revision
5.0 General information
5.1 Raw samples
5.2 Filtered samples
5.3 Solid-phase extraction of pesticides
5.4 Sample preservation
5.5 Handling and shipping of samples
5.6 Summary of sample-collection and sample-processing procedures for specific analytes
*Section 5.6.1.C, Phenols, has been revised in this section to create version 2.1 of chap. A5.
Conversion factors, selected terms, abbreviations, and chemical symbols and formulas
Appendix A5-A. Sample-designation codes and a summary of field-processing requirements for analyses of organic compounds in water
Appendix A5-B. Sample-designation codes and a summary of field-processing requirements for analyses of inorganic constituents in water
Appendix A5-C. Sample-designation codes and a summary of field-processing requirements for analyses of stable isotopes and radiochemicals in water
Appendix A5-D. Procedures for processing samples for analysis of dissolved and suspended organic carbon using a silver filter and gas-pressurized filtration apparatus (Note: Appendix A5-D has been added to Chapter A5, Version 2 (4/02) and contains the text for the Version 1 section 5.2.2.C.)
Chapter A5 Archives