The Chatsworth Reservoir is a dry reservoir located two miles to the east of Santa Susana Field Laboratory (SSFL).
Atomics International sampled soil and water from the reservoir in the 1950s and 1960s and results are reported in the Annual Site Environmental Reports (ASERs) at the time. No contamination was observed from this sampling.
In 2004, Essentia Management Services conducted a Soil Suitability Evaluation for the Los Angeles Department of Water and Power (LADWP) in the Chatsworth Reservoir. Samples were analyzed for chemical and radiological constituents. The report concluded that, "the unsaturated soil and groundwater underlying the reservoir bottom do not appear to contain constituents that would pose a health risk if the soil were used as a borrow material for earthworks construction for future industrial LADWP projects." For more information, please read the following Soil Suitability Evaluation report: