A stepped-wedge RCT will be conducted among communities before and after the intervention roll out. Study investigators will collect baseline information from all sites in the first monthly block (step) when no one will drink MAR water. There will be promoters who will convey messages regarding exclusive use of MAR water for drinking and cooking, at home and elsewhere. Measurements will be made by trained research assistants once every month. MAR water, pond water, groundwater and household stored water samples will be collected and tested once every month.