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Mark Graham

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Aquatic Ecologist, Centre for Water Resources Research, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal

Sewage leaks from damaged pipe in eThekwini, South Africa. Courtesy GroundTruth

August 25, 2025

South Africa’s sewage crisis: official reports don’t include millions of litres of leaking wastewater

Nicholas B. Pattinson, University of Cape Town and Mark Graham, University of KwaZulu-Natal

At least 20 million litres of sewage is leaking from pipes into the environment in just one South African city. The problem could cause ecological collapse.

A group of Enviro-Champs using a velocity plank to measure the depth and discharge of a river. Courtesy DUCT and GroundTruth.

March 14, 2024

Sewage leaks put South Africa’s freshwater at risk: how citizen scientists are helping clean up

Jim Taylor, University of KwaZulu-Natal; Mark Graham, University of KwaZulu-Natal, and Nicholas B. Pattinson, University of Cape Town

In South Africa, a group of citizen scientists who test water quality and log the results on a specialised app have helped keep the water supply for 4.3 million people clean.

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Location: Durban, South Africa
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Joined February 22, 2024