Ground water contains some impurities, even if it is unaffected by human activities. The types and concentrations of natural impurities depend on the nature of the geological material through which the ground water moves and the quality of the recharge water. Ground water moving through sedimentary rocks and soils may pick up a wide range of compounds such as magnesium, calcium, and chlorides. Some aquifers have high natural concentration of dissolved constituents such as arsenic, boron, and selenium. The effect of these natural sources of contamination on ground water quality depends on the type of contaminant and its concentration.
Many contaminants occur naturally: | |
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