River is the Dumping site for industries in Nairobi

The Nairobi river is one of the river that pass in capital city of Kenya.From where it's origin it has very clean water.But when it enters Nairobi it becomes a dumping site for Industrial waste and some resident waste.The  big problem that we have is how can we put policies to prevent this Industries from disposing the dangerous waste chemicals  in the river.
Industry dispose waste to the Nairobi river with dangerous chemicals and then there are some Kenyan who take advantage of the river by using the water for irrigation along side the river.Different farmers  plants different vegetables alongside the river. which are then sold to the local resident of Nairobi.My big question is when the industry dispose the waste into the river and as we know some of those chemicals can be absorbed by the plant e.g Mercury,Asbestos.What will happen when the consumer consume the vegetable.This is what causing many diseases in this 21st century in our Nairobi city.
  Government should help in preserving the river which is the only  river we can call it big  in Nairobi.The population in Nairobi is increasing with a big rate.The resident are disposing different type of waste in the river.People are building rental houses along the river like 5 meters from the river.This is making the river been overcrowded Near these river there are slums.Some of this slums do not have even Toilets.So they dispose all the waste in this river.

Mankind waste is not that harmful but the industrial waste is a big problem we have in the Nairobi river.The UNEP has tried a lot to fight with the disposing of dangerous waste in the river which is a good idea.But i have not heard of any thing from Central  government,County government and local N.g.o's.Trying to fight the vice.
 I do respect former Nobler prize winner  the late Wangari Mathai and former late Minister of environment Honorable Michuki for fighting well the war of preserving the environment.But the current government and leadership i have not heard of any Leader who have rose and fight the war like the two did.we have a gap in leadership in fighting the war in environmental issues.Everything they are just concern with is politics...politics.I have not heard of any Media house standing out and fight the issues in the environment we have all is politics...politics...politics.
  Lets unite and fight against the environmental vice.
Wangari Mathai