http://www.sciencedirect.com/s ...

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http://www.sciencedirect.com/science/article/pii/S0043135417302233

The above link is informative in this regard,particularly in the case of shallow groundwater sources that are commonly used as drink water sources,and liable to microbial contaminants,which is a main problem.

Chemistry may not change much,if protected reasonably from surface water flows