Marafiq is responsible for collecting and treating the sanitary and industrial wastewater from the community and industrial areas, in addition to treating the sanitary wastewater from Jubail town.   

The total network length is approximately 1,300 km for sanitary and industrial wastewater. All wastewater is collected through a pipeline network into a series of pumps and lifting stations located in the community and industrial areas. The critical pump stations and lifting stations are equipped with Odor Control Units. The wastewater is delivered to the two treatment plants which are the Industrial Wastewater Treatment Plant (IWTP8) and the Sanitary Wastewater Treatment Plant (SWTP9).

Industrial Wastewater Treatment Plant (IWTP8)

The Industrial Wastewater Treatment Plant is designed to treat incoming industrial wastewater from industries in the Jubail Industrial City. It has a design capacity of 148,000 cubic meters per day.

Sanitary Wastewater Treatment Plant (SWTP9)

The Sanitary Wastewater Treatment Plant is designed to treat incoming sanitary wastewater from industries, community area and Jubail town. It has a design capacity of 159,000 cubic meters per day.

The treatment plants use preliminary, secondary, and biological treatment processes with filtration and disinfection. Part of IWTP8 is equipped with advanced treatment through Fenton and Granulated Activated Carbon (GAC) in order to comply with the latest regulation from the Royal Commission.

Treated Effluent

The treated effluent from both the plants is utilized for landscape irrigation by the Royal Commission. The standard of irrigation water is maintained to meet the Royal Commission Environmental Regulation (RCER).