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*Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to MCLGs as feasible using the best available treatment technology and taking cost into consideration. MCLs are enforceable standards.
Thus, the difference between distilled water and sterile water is that whereas distilled water is not free from microorganisms and may permit their growth, sterile water is totally free from microorganisms .No organic growth is possible in this. It is this sterile water which is used for injections and parentaral preparations in pharmacy.