In their most detailed look yet at water quality in the streams that drain into the Delta, regulators found widespread pesticide pollution and compounds that have been banned for three decades.
Pesticides were found at 98 of 107 monitoring stations in the Central Valley. More than one-third of the time they turned up at levels high enough to exceed water-quality standards set to protect fish and humans.
The results are the latest from a program that, for the first time, is attempting to regulate water pollution in the runoff from California farms.
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