In a continually emergent globe, where many activities are high consumers of natural resources, including water, it has become absolutely necessary to apply methods of wastewater treatment. Wastewater treatment aims to advance water quality for many purposes and safe aquatic environment and control different harmful environmental factors. The study presented simple equipment system (pH control system) that used in the mechanical stage of a wastewater treatment and status of wastewater treatment process in case study (mixed drainage and industrial wastewater along Rahway drain). The main relation status of physicochemical parameter controlling wastewater treatment plant as operating factors that are electric conductivity (EC), pH and total dissolved salts (TDS) selected as optimum conditions for treatment control.