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The Purpose Of This Study Was To Determine Presence Of Heavy Metals Copper (Cu) And Iron (Fe) In Waters, Sediment And They Accumulation In Seaweed Euchema Cottoniat Amal Waters Tarakan City. Analysis Of Heavy Metals Are Using Method According To Kaushik (2009) And SNI. Presence Status In Water Using KEPMEN LH No.51 (2004) About Seawater Quality Standard. Status In Sediment Using The Canadian Environ Mental Quality Guidelines (2002) And The State Of Being On Seaweed Using SNI NO7387: 2009 Limit Of Heavy Metal Contamination In Food. On Water Sonly Detected Heavy Metals Cu Are 5.6 To 4.3 Mg/L. Heavy Metals Fe And CU Are Not Detected In Sediment. In Euchema Cottonii Has Detected Heavy Metals Cu And Fe. Cu Con Centration On Seedling Are 1,240 Mg/L, At The Age Of 2 Weeks Of 2,958 Mg/L, Age 1 Month Was Not Detected And At Harvest Are 0.246 Mg/L. Fecon Centration On Seedling When The 33,062 Mg/L, At The Age Of 2 Weeks Of 52,537 Mg/L, Age 1 Month 13,931mg/L And At Harvest 43,506 Mg/L. Status Of Presence Heavy Metal Cu And Fe Content In Waters, Sediment And Sea Weed Euchema Cottonii Are Below Of Thresh Old Value. Keywords: Heavy Metals, Water, Sediment, Euchema Cottonii, Presence Status