Dear Ingvar, Thank you for your information.The Ngong River is in an urban context and the water is contaminated with industrial effluents.It is blackish in colour but during rainy season the water are clean although I am not sure if there are contaminants.I am planning to do some water tests to ascertain the level of contamination. Regards, David.

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Dear Ingvar,

Thank you for your information.The Ngong River is in an urban context and the water is contaminated with industrial effluents.It is blackish in colour but during rainy season the water are clean although I am not sure if there are contaminants.I am planning to do some water tests to ascertain the level of contamination.

Regards,

David.