A recent development of the CMP approach, to implement rural water supply projects has beenrnpiloted in five woredas of the Metekel zone in Benishangul Gumuz regional state located at thernWestern part of Ethiopia. The assessment on the efficiency of the approach has been carried outrnin two woredas of the Northern part of Metekel Zone, namely, Mandura and Pawe woredas.rnFirst, it was checked if efforts have been put in to place and its applicability before evaluatingrnaccomplished results. In the second part, effectiveness of the approach was evaluated. In thisrnresearch, the approach is supposed to effective if implementation is efficient, if the built schemesrnare going to sustain and if schemes are providing proper and adequate services. Accordingly, arnrural water supply system is supposed to be sustainable up on achieving determinants ofrnsustainability. In this research, these aspects are taken as factors that indicate effectiveness,rnwhich is a means to measure advancement of the approach towards meeting objectives.rnMajor findings of the research were, elements of the approach were practiced as required exceptrnparticipating communities in technology option selection and post construction support. From thernidentified causes, it was recognized that there were no evidences found to articulaterninappropriateness of any elements of the approach for the study areas. Finally, the effectiveness ofrnthe approach, evaluated using averaging the scores attributed to indicators showed above averagernvalue that is, 68.61% and 76.70% for Mandura and Pawe woredas respectively. This is interpretedrnas its application has shown promising result, which only requires some adjustment and efforts forrnits complete implementation and better output. And it appeared that more effort is needed to securernspare part availability and improve efficiency of community financing. And in general terms, otherrnfactors to be given due consideration include skill and awareness of community, especially inrnMandura woreda where the socio economic situation is relatively poorer. Recommendations arernmade on how to deal with the gaps that has been identified for further accomplishments and stressrnon implementation procedures, which need focus for proper operation and maintenance so as tornassure sustainability of schemes.