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.
This report is in pdf format. Download a copy of Adobe Acrobat Reader for free.
Chapter A3 describes procedures for cleaning the equipment used to collect and process samples of surface water and ground water and procedures for assessing the efficacy of the equipment-cleaning process.
Sections of Chapter A3:
A3. Cleaning of Equipment for Water Sampling
3.1 Supplies for equipment cleaning
3.2 General cleaning procedures
3.3 Specific procedures for cleaning selected types of equipment
3.4 Quality control for equipment-cleaning procedures
Conversion factors and abbreviations
Selected references and documents
Chapter A3 Archive
(replacement text has been incorporated into the original pdf file dated 9/98--see "Comments and Errata")