A health official in Narok town has warned hoteliers against draining raw sewage into the drying Enkare-Narok river.
A spot-check by The Standard revealed that the river is completely dry upstream, but ironically, on entering the town, raw sewage flows freely.
Some of the suspected hotels releasing effluent are those located near the river and Olopito stream.
Garages operating nearby also drain used oil into the rivers.
Area County Health Director Daniel Sironka, who spoke when he met hoteliers recently, threatened to shut hotels disposing waste into the rivers.
The health official said water pollution was exposing local residents and their livestock to waterborne diseases.
Area National Environment Management Authority Director Patrick Lekenit said his office was investigating the source of the raw sewage and those responsible would face legal action.