Existing sewerage coverage is limited to the areas of Export Processing Zone Authority (EPZA), Athi River Town, some bit of lukenya area and the lower part of daystar university and part of Mlolongo west of Mombasa Rd. There is no existing sewer network in most parts of Mlolongo and Syokimau. It is estimated that the sewerage system covers about 15% of the existing developed area. The sewerage for the EPZA was constructed during the development of the site in 1997. It comprises 5.5 km of sewers which discharge into a trunk sewer for delivery to the treatment works, The EPZA on-site sewer network consists of DN 225 to DN 525 precast concrete spigot and socket pipes with about 120 manholes.
The sewerage in Athi River town is defined by elevation relative to the trunk sewer from EPZA to the treatment works. Areas on the upper side of the trunk sewer including, KMC. Sofia, Embakasi, Makandara and Ngei II are connected to the trunk sewer. Areas below the sewer drain to a pumping station where the sewage is lifted by pumping to the trunk sewer. The township is served by a 25 km long sewerage system that was constructed in 1950. Most of these sewer lines have not been augmented since 1950. The increased development in residential multi-dwelling units coupled with population growth has seen the sewer discharge increase without parallel improvement in the existing sewer network. The Athi River sewer network comprises network of sewers size with a diameter range of 200mm to 300mm.
A 300mm sewer line has been laid from Mlolongo to Athi River. It serves several industrial consumers and a few domestic customers along Mombasa road from KAPA oil refineries to Athi River. This line is connected to Pump Station 2 at Athi River from where the wastewater is pumped into the trunk sewer to the treatment works. A 19.6 km long concrete trunk sewer of size 525 to 1200mm and with three aerial river crossings runs from the EPZA to the treatment works. The design capacity of the existing plant is 6500m3/day.
The areas not served with sewerage use On-site sanitation facilities including septic tanks and pit latrines.
EXPANSION OF SEWERED AND NON-SEWERED SANITATION.
To expand sanitation infrastructure and roll out non-sewered sanitation interventions MAVWASCO intents to implement the following with support from the National government, County government of Machakos, TANATHI WWDA, and other development partners:-
- Construct 340kms of Trunk, Primary and Secondary sewer pipelines
- Develop a new 65,0000m3/day new sewerage treatment plant (STP)
- Acquire modern sewer equipment for infrastructure maintenance.
- Promote safe containment, emptying, transportation and treatment of faecal sludge
- Establish City Wide Inclusive Sanitation (CWIS).
- Implement a Schools WASH Program
