Pollution Profile for Enkare Narok River

Rivers which run across urban centers around the world are exposed to a constant threat of
pollution and degradation by human activities. This is due to the fact that urban centers are
densely populated and harbor a myriad of economic activities such as industries. The effluents
produced thereof coupled with the waste water (about 80% of water used by the population) end
up in the river in one way or another. This demands constant water quality monitoring and
measures to preserve the health of the rivers.
A classic example of a river which has suffered pollution as it runs through an urban center is the
Nairobi River.
This project sought to determine the pollution profile of the Enkare Narok River which runs
through Narok town, and to establish the contribution of the town activities to this pollution.
Four sampling stations were chosen along the river. The first one (S1) measured the quality of
the river before it interacted with the town while the last one (S4) checked the quality as the river
water flowed past the town boundaries. The other two stations lay between the first and the last.
For each station the following water quality monitoring parameters were tested: pH, electrical
conductivity, temperature, dissolved oxygen, BOD, COD, nitrates, iron, total coliform counts,
total suspended solids, total dissolved solids and the total solids. Sampling was done during the
wet and dry period. A comparison of these parameters was made across the four stations and
against the Environmental Management & Coordination Water Quality Regulations, 2006
It was found out that the river was slightly polluted and point source pollution identified as the
highest contributor to this. Relevant recommendations were put forward to address this issue.


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