Office of Environmental Health Hazard Assessment

FISH

Health Advisory And Safe Eating Guidelines For Fish From Folsom Lake And Lake Natoma (Sacramento, El Dorado And Placer Counties)
[10/15/08]

Mercury levels were evaluated in edible tissues of fish caught from Folsom Lake in Sacramento, El Dorado and Placer counties, an area possibly affected by historic gold mining. Mercury levels in fish were collected and analyzed by the U.S. Geological Survey for the U.S. Bureau of Reclamation. The contaminant data were evaluated by the Office of Environmental Health Hazard Assessment (OEHHA) to determine whether there may be potential adverse health effects associated with the consumption of certain sport fish from this water body and to identify fish species with low contaminant levels considered safe to eat frequently. Based on this evaluation, a health advisory and safe eating guidelines were developed that allow fishers to select fish to eat from Folsom Lake in quantities that maintain mercury exposures within safe levels while supporting the health benefits of fish consumption. Additionally, a previous state advisory for Lake Natoma in Sacramento County was revised using the newly developed advisory tissue levels (ATLs) for mercury and other contaminants. Lake Natoma is a 500-acre afterbay for Folsom Lake Dam. With the exception of catfish, mercury contaminant data for the two connected water bodies were similar; therefore, unified fish consumption guidelines for Folsom Lake and Lake Natoma were deemed justified.

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