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Great answers here and I agree with most. Here is a link to an article which again does not answer this directly but shows some significant relevance. This is based on work that we did to improve water quality monitoring in the Niassa province in Mozambique. Embedding regular water quality testing for wells and boreholes was proving difficult and so we looked at whether or not a standard sanitary survey could give us a relative risk score and if we could correlate this with the actual water quality. The findings clearly demonstrated a positive link between the stored water quality and the sanitary risk (and seasonal variations), particularly the general care and cleanliness (for which and apron helps significantly. I have not re-read the article, but I think you will find a lot of additional useful data and insights. https://www.iwaponline.com/jwh/004/0333/0040333.pdf