For almost four decades the U.S. Geological Survey has maintained a program of research and observation in San Francisco Bay. The program includes regular measurements of water quality along a 145 kilometer transect spanning the length of the entire estuarine system. This website describes the measurement program, displays results of water quality measurements, and makes the full data set available to all interested users.

Explore here to see EXAMPLES of different displays of water quality variability.

Check out the glossary of technical terms used on this website.

Contact us with questions or comments.

This project and website is supported by a number of agencies.

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