This thesis examines household water supplies available to resettled peri-urban communities in Phnom Penh through a case study approach. Water quality parameters are quantified and their relationships with other factors are examined. A Quantitative Microbial Risk Assessment Methodology is applied to assess diarrheal disease risk due to microbial contamination of drinking water. Finally, community practices, preferences and perceptions of water supplies are examined. More work is needed to improve drinking water access by resettled Phnom Penh residents. Current risk levels greatly exceed those associated with the piped water alternative. A primary concern is the negation of the risk reductions gained by boiling - awareness is needed on post-boiling contamination due to poor storage and the use of highly contaminated source waters. Rainwater storage capacity must be improved in poorer communities to increase improved water source access. Future work must also better consider community perceptions and preferences to be effective.