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Water supply and sanitation in Nairobi is characterised by achievements and challenges .. Among the achievements is the expansion of infrastructure to keep pace with population growth , in particular through the construction of the Thika Dam and associated water treatment plant and pipelines during the 1990s ; the transformation of the municipal water department into an autonomous utility in 2003 ; and the more recent reduction of water losses -- technically called non-revenue water -- from 50 to 40 % .. Thika Dam. Thika Dam. non-revenue water. non-revenue water. Challenges include poor quality and intermittent water supply -LRB- only 40 % of those with house connections receive water continuously -RRB- , the loss of storage capacity in reservoirs behind dams through siltation accelerated by erosion in the Aberdare Range , lack of access to adequate sanitation in slums where half the population of the city lives , blockages of sewers resulting in overflows , and unused capacity in the city 's largest wastewater treatment plant in Dandora .. Aberdare Range. Aberdare Range. Another problem is political infighting and corruption , leading to the firing of the entire Board of the Nairobi Water Company in 2009 .