KWS Probes Suspected Chemical Discharge at Athi Dam

The Kenya Wildlife Service has launched an emergency investigation following the detection of a suspected chemical discharge into the Mlolongo-Athi Dam ecosystem.

Officers on routine patrol identified foamy, discoloured water originating from the upper drainage corridor on the morning of April 30, 2026.

The contamination, characterized by white, effervescent bubbles and unnatural coloration, has raised immediate alarms regarding the health of the Nairobi National Park wildlife sanctuary.

Early reports suggest the runoff likely originated from industrial zones within the Mlolongo area.

KWS confirmed that the flow is moving through the drainage corridor that feeds directly into the park’s water systems, including the Mbagathi River and Athi River networks.

A multi-agency intervention has been activated, involving the National Environment Management Authority and the Water Resources Authority.

Technical teams are currently on the ground collecting water samples to determine the exact chemical composition of the pollutants.

These samples will be used to trace the discharge back to its source, with authorities targeting specific facilities in the catchment area.

The potential for widespread ecological damage is high, as the Athi Dam serves as a critical water source for diverse aquatic life and terrestrial wildlife.

Beyond the park boundaries, the contaminated water poses a risk to downstream users, including agricultural projects and local communities that rely on the river for livestock.

The public has been advised to avoid any contact with the affected water bodies until the investigation is concluded.

Citizens are being urged to refrain from fishing in the impacted sections and to report any wildlife seen showing signs of distress.

KWS has issued a stern warning to facility operators within the Mlolongo catchment area regarding the illegal discharge of untreated waste.

Offenders found responsible for the spill could face prosecution, heavy fines, and the potential closure of their facilities.

The agency noted that investigations remain ongoing to confirm the exact industrial source of the foamy effluent.