The Supreme Council for the Environment & Natural Reserves (SCENR) has issued new environmental standards that are aimed at reducing the environmental impact of the processing facilities. The new regulations specify that the maximum concentration of free residual chlorine is 0.05 mg/L for discharge of cooling water. Industries in Messaaeid Industrial City (MIC) have been challenged to meet the new residual chlorine standards. This project is to study the environmental impact of residual chlorine in seawater and develop tools for prediction of chlorinated byproducts. The goal is to determine residual chlorine standards that are based on the impact considering the local environmental conditions.