The Third schedule of the regulation restricts effluent discharge from facilities
listed under the Fourth Schedule (monitoring guide for discharge into the
environment) or other point sources to the standards stipulated under the 3rd
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Schedule (standards for effluent discharge into the environment). They oblige
operators of such facilities to install pollution prevention systems such as oil
Interceptor or oil-water separator where wastewater is contaminated with oil and
grease. The oil and grease in the discharge should be nil. The standard for
grease and water was set taking into account that a major portion of the Kenyan
population drinks water directly from water sources and therefore the need to
protect them. Water contaminated with oil is also very dangerous to aquatic life.