Kesterson Reservoir

Kesterson Reservoir is a protected wetland area in California's San Joaquin Valley composed of twelve evaporation ponds and grasslands. The site was designed to manage water runoff from nearby farming operations in the Central Valley.

The site was constructed in 1971 as part of the San Luis Drain project to manage agricultural water discharge from California's Central Valley. It later became the focus of environmental concern when water quality issues emerged affecting local wildlife.

Scientists and environmental researchers study this location to understand the effects of selenium contamination on wildlife populations and ecosystem rehabilitation methods.

Public access to the site is heavily restricted due to ongoing environmental monitoring work. Visitors should check ahead to learn which areas might be open and what rules apply when visiting.

The site gained attention in the 1980s when birds were observed with birth defects caused by contaminated water. This discovery led to the term Kesterson Syndrome, now used in environmental science to describe similar contamination events.

Location: California

Part of: San Luis National Wildlife Refuge

GPS coordinates: 37.25830,-120.89200

Latest update: December 11, 2025 11:09