National Water-Quality Assessment (NAWQA)
Method, Sampling, and Analytical Protocols

• National field manual for the collection of water-quality data (USGS Techniques of Water-Resources Investigations Book 9, Chapter A1-A9)

• Design of the National Water-Quality Assessment Program: Occurrence and distribution of water-quality conditions (USGS Circular 1112)

• Guidelines for studies of contaminants in biological tissues for the National Water-Quality Assessment Program (USGS Open-File Report 92-494)

• Field guide for collecting and processing stream-water samples for the National Water-Quality Assessment program (USGS Open-File Report 94-455)

• Guidelines for collecting and processing samples of stream bed sediment for analysis of trace elements and organic contaminants for the National Water-Quality Assessment program (USGS Open-File Report 94-458)

• Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of pesticides in water by C-18 solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring (USGS Open-File Report 95-181)

• Ground-Water Data-Collection Protocols and Procedures for the National Water-Quality Assessment Program: Selection, Installation, and Documentation of Wells, and Collection of Related Data (USGS Open-File Report 95-398)

• Ground-Water Data-Collection Protocols and Procedures for the National Water-Quality Assessment Program: Collection and Documentation of Water-Quality Samples and Related Data (USGS Open-File Report 95-399)

• Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of pesticides in water by Carbopak-B solid-phase extraction and high-performance liquid chromatography (USGS Open-File Report 96-216)

• Quality-control design for surface-water sampling in the National Water-Quality Assessment program (USGS Open-File Report 97-223)

• Field guide for collecting samples for analysis of volatile organic compounds in stream water for the National Water-Quality Assessment Program (USGS Open-File Report 97-401)

• Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of 86 volatile organic compounds in water by gas chromatography/mass spectrometry, including detections less than reporting limits (U.S. Geological Survey Open-File Report 97-829)