Abstract: Many of the water projects within Machakos County that were started, funded and supported by international agencies as well as Constituency Development Fund (CDF) still failed to deliver water over a prolonged time with six out of ten becoming dysfunctional within three years of operations. Sustenance of projects is important hence this study considered stakeholders’ participation. The main study objective was to investigate effect of stakeholder participation on water projects sustainability within Machakos County in Kenya.