The strength of WPM is comprehensiveness with respect to the sample of water points audited, which results in the need of roughly covering the overall area of intervention. The drawback of the WPM approach, however, is that the focus is on water points, while sanitation and hygiene data need to be collected at the household. An approach for WASH data collection that combines a water points mapping with a household-based survey might overcome previous constraint. The new methodology takes the WPM as a starting point to comprehensively record all improved water points, being the water point basic sampling unit. This information can be then combined with data provided from a household survey to assess sanitation and hygienic habits. In terms of method, the approach adopted includes: (i) identification and audit of all improved water points; (ii) calculation of a sample size of households that is representative at and below the district level; and (iii) random household selection at the water point.
