<![CDATA[The Mangunharjo Waters, Semarang, is an area used for fishing and pond cultivation. Around this area, there are wood, ceramic, and plastic industries that have the potential to discharge waste into the waters. These activities pose a risk of heavy metal pollution, which can accumulate in aquatic organisms, such as oysters. Oysters are widely used by the coastal communities of Mangunharjo for consumption and sale, so the presence of cadmium (Cd) in marine biota can pose a risk to human health. This study aims to determine the concentration of Cd in sediments and oysters, the Bioconcentration Factor (BCF) value, and the maximum weekly consumption limit of Cd heavy metals in oysters in Mangunharjo Waters. This study was conducted in May-June 2025. The research method used was a survey with a quantitative descriptive approach, with three stations and two repetitions. The results showed that Cd levels in sediments ranged from 0.0005-0.019 mg/kg, and in oyster soft tissue ranged from 0.006-0.037 mg/kg. The BCF (o-s) values ranged from 0.54 to 74, and the BCF (o-w) values ranged from 0.105 to 18.554, indicating the oysters' ability to accumulate Cd from sediment and low water. The Maximum Weekly Intake (MWI) values were 0.105 mg/week for children, 0.28 mg/week for adolescents, and 0.42 mg/week for adults.]]>
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