Maximum Contaminant Levels (MCLs) represents the highest acceptable level of contaminants in drinking water. The unit used for MCLs is milligrams per litre (mg/L), which corresponds to parts per million (PPM). The Federal Water Quality Maximum Contaminant Levels (MCLs) are contained under the Safe Drinking Water Act (SDWA). MCLs are provided for a list of … Continue reading What are Federal Water Quality Maximum Contaminant Levels (MCLs)?