If missed recent papers published from the UPGro Gro for GooD study, then you can get up to speed with the key points in these new briefs from Oxford University:
Risk factors associated with rural water supply failure: A 30-year retrospective study of handpumps on the south coast of Kenya
A critical mass analysis of community-based financing of water services in rural Kenya
Evaluating waterpoint sustainability and access implications of revenue collection approaches in rural Kenya
and from related non-UPGro research: