Abstract
In 1974, analyses for asbestos fibers were conducted on a one‐time basis at the surface water supply reservoirs of The Metropolitan Water District of Southern California. Although no asbestos fibers were found at that time, a further analysis in 1980 detected the presence of asbestos in the water supply that originates in Northern California. This paper presents the data from the initial and follow‐up surveys (1980–1981) and identifies potential sources of the asbestos fibers, which include high background counts from erosion of serpentine minerals in the aqueduct watershed and a point source near Coalinga, California. Based on these studies, a program was initiated to remove asbestos‐contaminated sediments from the bottom of the aqueduct between Coalinga and the A.D. Edmonston Pumping Plant.
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