Table 1.

Information used for the analysis.

Point of collection (POC)b	Surrounding environment–hygiene condition	Water storage condition and HWT
Type of POC [Which source do you use for drinking water purpose right now?]b	Still practise open defecation [What types of toilet do you have?]	Storage covered [Is the water storage being covered (at that time)?]
Livestock nearby [Is there livestock near the point of collection (POC), 10 m?]	Livestock nearby [Is there livestock around the house?]	Storage cracked [Is the container cracked?]a
Prone to erosion [Is the area uphill from the source visibly eroded or prone to erosion?]	Floor cleanliness [How is the cleanliness of the house floor?]a	Place of storage [When not in use, is the storage container kept in a place where it may become contaminated? E.g., can be reached by animal easily; open space (risk by flies), etc.]
Excreta / garbage nearby [Is excreta or garbage found within 10 m of the tap stand/water source?]	Faeces around [Is there human or animal faeces in the yard (or even inside the house)?]a	fullness level of water at storage [How full is the water storage?]a,c
Proper fencing [Is there proper fencing or a barrier around the well to prevent contact with animals?]	Garbage around [Is there garbage around the house?]	Household water treatment [Is the water in the storage treated?]
Latrine within 10 m [Distance to the nearest latrine (m)]	Flies around [Could you see flies around the water storage container?]
Cracked structure [Are there any damages/cracks in the system/source?]
E. coli detected at POC/wellb

^aThe sentence inside the [ ] were the questions in the sanitary inspection and the italic words were the variable/node name in the BBN.

^bBased on water quality testing.

^cExternal variable besides standard SI variables.