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The EPA also sets National Secondary Drinking Water Regulations (NSDWR). Secondary drinking water standards are not Federally enforceable but serve as a guideline for the States to follow. At present, there are 15 NSDWR contaminants.

  • Aluminum
  • Chloride
  • Color
  • Copper
  • Corrosivity
  • Fluoride
  • Foaming agents
  • Iron
  • Manganese
  • Odor
  • pH
  • Silver
  • Sulfate
  • Total dissolved solids
  • Zinc
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