The young male had eluded capture after spending a few weeks in a suburban recreational lake, popping up in gardens and on roads, while on the run from its home reserve.
It then moved into the sewage treatment works, whose abundant water and lush grazing have made it a popular choice for the city's escapee hippos.
The operation to capture the hippo took 90 minutes, before it was transferred to a private game reserve, 380 kilometres east of Cape Town.
The semi-aquatic animals are known to be extremely violent at times and can run faster than a human on land.
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"We were very, very worried because obviously it's such a dangerous animal," Wood told AFP about it having settled in the suburban lake.
The hippo escaped a city-run nature reserve after part of a boundary fence was stolen, and took to an outer settling pond of the wastewater plant.