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grond water contain large quantities of chlorides more than 250 ppm cause kidney problems,flurides more than 1.00 ppm cause flurosis,nitrates more than 45 ppm cause methemoglobinomia -blue baby born-and cause cancer.best solution is to harvest roof top of houses rain water filter and store in a sump and use to solve drinking water problems. Dr. H.R.Prakash rtd soil and water analyst agriculture department governament of karnataka