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Drinking Water Standards

Standards that define allowable water quality limits for potable and domestic water supplies. The U.S. Environmental Protection Agency (EPA) is responsible for the National Primary Drinking Water Regulations, which are health-related standards that establish the Maximum Contaminant Levels (MCLs) for regulated substances in drinking water. An MCL is the highest permissible level of a contaminant allowed in water delivered to the consumer's tap. MCLs are enforceable at public water systems under the Safe Drinking Water Act. The EPA also has set Maximum Contaminant Level Goals (MCLGs) at levels which no known or anticipated adverse effects on the health of persons occur and which allow an adequate margin of safety. The enforceable MCL is set as close to the MCLG as reasonable, taking into consideration the costs and treatment techniques available to public water systems. National Secondary Drinking Water Regulations, also issued by the EPA, pertain to aesthetic characteristics of water and are advised, but not enforceable, by the Federal government. See Also: Yield Potable (Drinking) Water Aesthetic Contaminants Health Contaminant Drinking Water Potable (Drinking) Water Safe Drinking Water Act (SDWA) Safe Water Club Soda Community Water System Zone of Saturation Bottled Artesian Water Bottled Distilled Water Bottled Fluoridated Water Bottled Mineral Water Bottled Natural Water Lime Soap Bottled Spring Water Brackish Water Brine Internal Water Treatment Ion Exchange Aesthetic Contaminants Health Contaminant Drainage Basin Drinking Water Municipal Water Permutit Process Phosphate Potable (Drinking) Water Etching External Water Treatment United States Pharmacopeia (USP) Water Softening WFI Sulfur (S) Safe Drinking Water Act (SDWA) Safe Water Sewage Silica Sodium Carbonate Softened Water Soft Water Crenothrix Polyspora Cyclospora Biostat Cyanobacteria-like Bodies (CLBs) Gallionella Ferruginea Organic Iron Organism Oxidation Oxidize Oxidizing Agent Alkylaryl Sulfonate Alkylbenzene Sulfonate (ABS) Desulfovibrio Potable (Drinking) Water Emulsification Redox Retention Wetting Agent Thiobacillus Thiobacillus