The Benoni WCW is situated within the DD3 drainage district. Built in 1935 and upgraded on several occasions over a period of time, the works is designed to treat 16 megalitres of industrial and domestic wastewater per day from the Actonville, Apex and Benoni central areas. Conventional biological filtration is employed as the main treatment process.

A central inlet works, incorporating the processes of screening and grit removal, serves the plant. The biological filtration process includes primary sedimentation, biological filtration and humus clarification. The humus tank effluent is finally treated to chemically remove ortho-phosphate and chlorinated before discharging it into the Amato Pan. A portion of the final effluent is used by various industries as cooling water. In the dry winter months, final effluent is supplied to the Korsman Bird Sanctuary. The Amato Pan overflows into a tributary of the Blesbokspruit.