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The contamination of Surabaya's water river, one of the reasons, is caused by the lack functioning of Wastewater Treatment Plant (WWTP). If the WWTP can be designed properly and in accordance with wastewater flow and characteristics, then the operation of WWTP is expectedly able to overcome or to reduce the water river contamination. Effects of wastewater quality and quantity fluctuations are considered as highly influential in the selection ofthe WWTP. The fluctuations are measured by wastewater sampling on H-Mall, with the flow measurement and laboratory analysis of COD, BOD, TSS, NH3, PO4, and O&G parameters. Wastewater quality and quantity in H-Mall of Surabaya are fluctuating hourly in a day, daily in a week, and the control chart analysis found that the parameters of TSS, NH3 and PO4 exceeds the 3 standard deviation. The design of the equalization basin for WWTP is considerably …