It depends. First and ...

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It depends. First and foremost is protecting the borehole from any pollutants entry..so, waste water and sources of pollution have to be far away from getting any easy entry into the aquifer feeding the bore hole. Periodic checking of Borehole water has to be done. If it is sufficiently deep borehole in a large aquifer and water sample is safe, then no need of any further treatment unless any water sample shows impurities/ pollutants.

If aquifer is shallow or water sample shows contaminants, then, suitable treatment is required depending upon what type of pollutant is reported.