The Kesterson National Wildlife Refuge is an artificial wetland environment, created using agricultural runoff from farmland in California's Central Valley.
The irrigation water is transported to the valley from sources in the Sierra Nevada mountains via the California Aqueduct. Minerals from these sources are carried in the water and concentrated by evaporation from aqueducts, canals, and fields. This has resulted in an exceptionally high accumulation of selenium and other minerals in the wetlands. Wildlife in this region suffered deformities due to selenium poisoning, drawing the attention of news media and leading to the closure of the refuge.
Kesterson Reservoir was a unit of the refuge but is now part of San Luis National Wildlife Refuge.
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