Murang'a County occupies a critical position in Kenya's hydrological geography, sitting astride the southeastern slopes of the Aberdares Range where some of the country's most important rivers originate. The county's dense network of streams and rivers - including the Mathioya, Maragua, and tributaries of the Tana and Athi rivers - feeds water supply systems that serve millions of people far beyond Murang'a's borders, making the county's water resources a matter of national significance and recurrent political controversy.
The Ndakaini Dam, completed in 1994 on the Thika River within Murang'a County, is the single most important water infrastructure serving Nairobi History and its metropolitan area. The reservoir, with a capacity of approximately 70 million cubic meters, supplies the bulk of Nairobi's treated water through the Thika-Ndarugu water supply system. This arrangement has generated persistent grievances among Murang'a residents, who argue that their county bears the environmental costs of water extraction - including restrictions on farming near the reservoir, loss of productive land to the dam's footprint, and downstream flow reductions - while receiving inadequate compensation and suffering their own water shortages.
The water politics of Murang'a reflect broader tensions inherent in Kenya Land Reform and resource governance. During the Colonial Administration, forest reserves and water catchments in the Aberdares Range were gazetted partly to protect water supplies for settler agriculture in the White Highlands and the growing colonial capital. Post-independence governments maintained and expanded these protections, but the benefits continued to flow disproportionately to Nairobi and downstream users. The Kikuyu farming communities of Murang'a, who had supported the Mau Mau Uprising partly over land and resource grievances, found that independence did not fully resolve the inequities of resource distribution.
Deforestation in upper Murang'a has compounded water challenges. The clearing of indigenous forest for tea cultivation (Tea Industry Kenya) and smallholder farming has reduced the watershed's capacity to regulate water flows, increasing seasonal flooding while diminishing dry-season baseflows. The Aberdares forest, a critical water tower, has been subject to competing pressures from agricultural expansion, charcoal production, and settlement by landless populations. Conservation efforts, including the Aberdares electric fence project supported by Rhino Ark and the Kenya Wildlife Service, have sought to protect the forest frontier, but enforcement remains contentious among communities who view restrictions as limiting their livelihood options.
The Kenya Constitution 2010 and Devolution Kenya restructured water governance, assigning county governments responsibilities for local water supply while retaining national authority over major infrastructure. The Water Act of 2016 established water resource authorities and attempted to rationalize the complex institutional landscape. However, the inter-county dimension of Murang'a's water resources - serving Nairobi, Kiambu, and other downstream counties - creates coordination challenges that devolution was not designed to resolve easily.
Climate change threatens to intensify Murang'a's water challenges. Shifting rainfall patterns, with more intense but less frequent precipitation events, strain both water supply infrastructure and agricultural systems. The county's rivers, which have historically provided reliable flows for irrigation, domestic use, and small-scale hydropower, are increasingly variable. Addressing these challenges requires integrated watershed management that connects upstream Conservation with downstream demand management, a Policy approach that transcends both county boundaries and electoral cycles.
See Also
Sources
- Kiteme, B., & Gikonyo, J. (2002). "Fencing the Forest: Conservation Efforts Around the Aberdares, Kenya." Mountain Research and Development, 22(2), 137–139.
- Mumma, A. (2005). "Kenya's New Water Law: An Analysis of the Implications for the Rural Poor." In African Water Laws, edited by B. van Koppen et al. Pretoria: IWMI.
- Nairobi City Water and Sewerage Company. (2018). Strategic Plan 2018-2022. Nairobi: NCWSC.