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There are Hydrogen Sulphide kits H2S which show the presence or absence of faecal coliforms, there is some debate about them. They are available here:

Here are several publications that might help. The Oxfam manual on emergency water quality testing is good, the WHO guidelines on drinking water quality are definitive (Found at

You probably will have to carry out a strong level of hygiene promotion to make communities understand about water quality and disease and to try to change their behaviour. The PHAST methodology (Participatory Hygiene and Sanitation transformation) is good but not, as the name suggests, very fast Regards, Toby Gould