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Objectives. According to Arung (2010), Mahakam River content of copper (Cu), about 1.15 mg / L. Therefore it is necessary to predict exposure of Cu contained in the Mahakam River to Environmental risk.
Method. The research is done to find out how big the human health risks due to exposure to Cu (Copper) in Mahakam River water with the method of Environmental Health Risk Assessment (EHRA) by identification hazard, dose-respon assessesment, exposure assessment and risk management . Risk for intake no cancer risk refer to if risk quotient (RQ) > 1 so the risk to health, while the risk of cancer if excess cancer risk (ECR)= >E-4 so that no cancer risk.
Result.Predict exposure of Cu contained in the Mahakam River to Environmental risk is RQ > 1(risk no cancer effect and ECR < E-4 (no risk cancer effect). Three exposure duration is 1 year, 5 years, and 10-year, values â€‹â€‹obtained RQ (1 year) is 4.45; RQ (5 years) amounted to 22.26; and RQ (10 years), namely 43.33, whereas for the calculation of the results obtained ECR (1 year) is 2.45 X 10-3; ECR (5 years) 4.29 X 10-3; and ECR (10 years) is 8.59 X 10 - 3.
Conclusion. Consumption of water in the Mahakam River risk to health (no cancer effect ). Waste water management shipbuilding industry as a source of Cu contamination in the Mahakam required to do wastewater treatment before disposal and water treatment community needs to do first before using the Mahakam river water. and monitoring water to be must continue.
Key word ; Environmental Health Risk,Cu,Mahakam