This thesis examines the historical introduction and spatial expansion of modern water supply infrastructure in Amhara region across the three successive regimes: imperial, military, and EPRDF. It attempts to explore the institutional setup of the three governments together with their policies and strategies. The study also aims at giving an idea about the socio-economic changes registered because of improved access to safe water. Furthermore, it assesses the water consumption and conservation pattern of the society and the environmental impact of the water infrastructure development. Modern infrastructure development in Ethiopia traced its beginning back to the late 19th century. Safe drinking water supply had been one of those modern infrastructures introduced in Addis Ababa. Not long afterwards, it proliferated to the provinces. In Amhara region, drinking water supply infrastructure construction began in the early 20th century. However, this thesis inquired whether there was a programmed water supply infrastructure development before the mid-1950s or not. The water supply work started gaining momentum and became a state program in the late imperial period. However, it was affected by financial, technological and trained human resource constraints, lack of appropriate institution, defective management systems, and improper implementation methods. The military government had strengthened water supply institutions and improved workers' expertise. These developments helped the water supply infrastructure work to be executed in a programmed manner. Yet, financial restraints, the incessant political chaos of the time and the accompanied disruptive working environment had greatly impacted the temporal and spatial coverage of the water supply infrastructure development. The promising start of the Derg period did not continue with similar pace during the early years of the EPRDF rule. Despite the efforts made to set up water institutions at Regional, Zonal and Woreda (district) levels, no significant achievement was recorded in the field. The aftermath of the civil war together with internal and external challenges epitomized the transition period had impinged on the water supply work. This thesis testifies to the emergence of some socio-economic changes in the region. Yet, the slow progress of the water supply infrastructure work had stalled the socio-economic change that should have been registered through improved access to safe water supply. Despite the observable environmental degradation, the thesis argues that the retarded water supply work had nothing to do with the dearth of fresh water. While the trend shows steady growth of water consumption level across the three regimes, the conservation habit of the population remained low. / D.Litt. et Phil. (History)