Karie treatment works is situated approximately 6 kms from the head office off Sagana road. It is situated on a 55 acres land.

This is the facility where all the waste water (effluent) emanating from domestic use is collected and treated.

The population served by sewer network in Murang’a town and its environs is approximately 25,000.

The type of treatment is waste stabilization ponds system (WSP).
Its a low cost technology that is appropriate in the warm climates of developing countries.

The ponds are shallow, rectangular lakes in which domestic wastewater is retained for between 10 and 100 days, depending on the climate, to allow the removal of BOD, excreted pathogens and nutrients. They are usually arranged in series of anaerobic, facultative and maturation ponds to improve the efficiency of their performance.

The treatment process is natural, biological and physical.
Factors that contribute to effective treatment are:
Retention time
Algae-driven Photosynthesis
Wind mixing
Anaerobic bacteria
Aerobic bacteria

Challenges facing waste water treatment

Since the treatment process is wholly biological, entry of other forms of discharge can affect proper treatment if not controlled properly
Oils and grease from car wash and petrol stations.
Silt, soil and stones get their way into the sewer network through open manholes damaged by vehicles or due to vandalism of covers causes blockage of the sewer network thus environmental pollution.
Rags, cloth pieces and sanitary pads flashed at households causing blockage of sewer network.

Untapped benefits.

The gas released at the anaerobic ponds can be tapped and used as biogas.
The sludge can be used as mature in farms
The final waste water can be recycled and used for agricultural purposes.

Exhauster Services

It contains 7000 litres and a customer is required to pay Kshs.6000 for the services. The charges for private Exhauster Services are Kshs.1,000

Service Brochure


An overview of our services from water treatment, supply to waster management