Cape Town's R5.2 billion Potsdam Wastewater Treatment Works upgrade has reached 80% completion, with new membrane bioreactor filters installed as a major commissioning milestone.

The 65-million-litre-a-day membrane system forms part of an expansion intended to lift total plant capacity from 47 to 100 million litres a day.

Components already operating

The City says the ultrafiltration plant is operating, while the treated-effluent pump station has been completed. A new dewatering plant has been operating since June 2025, with further trial operations scheduled.

Commissioning of the inlet works and raw-sewage pump station is under way. The membrane bioreactor was scheduled to follow, with the wider plant upgrade targeted for completion in 2027.

An 80% construction milestone does not mean the complete plant has entered service. Process commissioning, testing and remaining construction must be completed before final handover.

What we will track next

The next useful update should connect physical progress to service performance. For R5.2bn Potsdam wastewater upgrade reaches 80% completion, that means identifying which assets are commissioned, who operates them, whether water-quality or effluent tests are current and how reliability is measured after handover. Published percentages are easier to assess when the reporting date, design capacity, actual flow and outstanding work appear together.

Readers should also look for power resilience, maintenance funding, trained operators and a defects process. Pipes, pumps, reservoirs and treatment units form one chain; completion of one component does not prove that the full service is working.

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