Guidelines for Field-Measured Water-Quality Properties

Techniques and Methods 9-A6.0



The “National Field Manual for the Collection of Water-Quality Data” (NFM) provides guidelines and 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, NFM A6.0, provides guidance and protocols for the measurement of field parameters on site, which include the selection of sites and methods for measurement in groundwater and surface water and procedures for measurement and reporting. It updates and supersedes USGS Techniques of Water-Resources Investigations, book 9, chapter A6.0, version 2.0, by Franceska D. Wilde. Field parameters are routinely measured when water samples are collected, are often measured continually at USGS streamgages, and are regularly measured during laboratory and field experiments. The field methods for measuring field parameters described in this chapter are applicable to most natural waters.

Before 2017, the NFM chapters were released in the USGS Techniques of Water-Resources Investigations series. Effective in 2018, new and revised NFM chapters are being released in the USGS Techniques and Methods series; this series change does not affect the content and format of the NFM. More information is in the general introduction to the NFM (USGS Techniques and Methods, book 9, chapter A0) at The authoritative current versions of NFM chapters are available in the USGS Publications Warehouse at Comments, questions, and suggestions related to the NFM can be addressed to

Suggested Citation

U.S. Geological Survey, 2023, Guidelines for field-measured water-quality properties: U.S. Geological Survey Techniques and Methods, book 9, chap. A6.0 [version 1.1, July 17, 2023), 22 p., [Supersedes USGS Techniques of Water-Resources Investigations, book 9, chap. A6.0, version 2.0.]

ISSN: 2328-7055 (online)

Table of Contents

  • Abstract
  • 1.0 Introduction
  • 2.0 Quality Assurance
  • 3.0 Performing Field Measurements
  • Acknowledgments
  • Selected References
Publication type Report
Publication Subtype USGS Numbered Series
Title Guidelines for field-measured water-quality properties
Series title Techniques and Methods
Series number 9-A6.0
DOI 10.3133/tm9A6.0
Edition Version 1.0: July 10, 2023; Version 1.1: July 17, 2023
Year Published 2023
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) WMA - Observing Systems Division
Description vi, 22 p.
Larger Work Type Report
Larger Work Subtype USGS Numbered Series
Larger Work Title National Field Manual for the Collection of Water-Quality Data. U.S. Geological Survey Techniques of Water-Resources Investigations, Book 9
Online Only (Y/N) Y
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details