AbstractThis article contains a summary of a few disease out‐breaks caused by ground‐water contamination, and the difficulties in designing and monitoring for effective quality control. There is a discussion of problems associated with large basin recharge with treated sewage. For instance, do we have adequate microbial indicators? Or will the nitrate concentration build up if there is a semiclosed circuit involved? Chlorination of well water withdrawn for domestic use is advocated as good insurance for microbial cont
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