USGS Water-Quality Information
Water Quality Data
Today's Water Conditions
Get continuous real-time water-quality measurements from Water-Quality Watch maps.
Water Quality Portal (WQP)
Get current and historical USGS and EPA water-quality data at the WQP.
Get stream ecosystem aquatic bioassessment data from BioData.
For More Data
USGS in Your Area
USGS Water Science Centers are located in each state.
6.0 Guidelines for Field-Measured Water-Quality Properties
By F.D. Wilde
This section of Chapter 6 is available as a pdf file:
Download a copy of Adobe Acrobat Reader for free.
This report summarizes information, guidelines, and minimum requirements that apply generally to the seven field-measurement sections that comprise the rest of Chapter A6 of this U.S. Geological Survey (USGS) National Field Manual for the Collection of Water-Quality Data (NFM). Protocols are specified for establishing and maintaining data records, use of field-measurement instruments and methods, and quality assurance of data-collection and reporting methods that are relevant to surface-water and ground-water field-measurement activities.
6.0 - Guidelines for field-measured water-quality properties
6.0.1 Quality assurance
6.0.2 Surface water
6.0.3 Ground water
6.0.4 Selected references
Section 6.0 Archived Versions: