Mogale City is pumping raw sewage into rivers and the surrounding environment after the municipality's wastewater treatment works collapsed to critical levels.
The failure threatens the Cradle of Humankind World Heritage Site, a region of immense paleontological importance in South Africa's Gauteng Province. The discharge of untreated waste into the local ecosystem risks contaminating water sources and damaging the integrity of the protected heritage area.
According to reports, all three municipal wastewater treatment plants have collapsed [3]. This systemic failure has led to the direct discharge of raw sewage into the environment. Trevor Brough, Director of the Cradle of Humankind World Heritage Site Association, said the situation is severe as the municipality struggles to manage its infrastructure.
The decline in infrastructure performance is reflected in the municipality's Green Drop scores, which measure water and wastewater quality. In 2013, Mogale City held a Green Drop score of 75% [1]. However, by 2025, that score dropped to below 30% [2].
The collapse of these facilities indicates a prolonged period of degradation in the city's sanitation systems. Because all three plants are failing, there is currently no functional redundancy to prevent sewage from entering the river systems that feed into the World Heritage Site.
Local officials and heritage advocates are now facing the consequences of this infrastructure deficit. The contamination of the environment not only poses a public health risk but also threatens the biological and geological assets of the Cradle of Humankind, a site recognized globally for its role in tracing human evolution.
“All three municipal wastewater treatment plants have collapsed”
The collapse of the entire wastewater treatment network in Mogale City suggests a systemic failure of municipal governance and infrastructure maintenance. The sharp decline in the Green Drop score from 75% to below 30% over 12 years indicates a steady erosion of service delivery. For a World Heritage Site, this environmental contamination could lead to long-term ecological damage and potential scrutiny from international heritage bodies regarding the site's protection.
