The EPA’s website states, “The Safe Drinking Water Act (SDWA) defines contaminant as any physical, chemical, biological, or radiological substance or matter in the water.  Drinking water may reasonably be expected to contain at least small amounts of some contaminants.  Some contaminants may be harmful if consumed at certain levels in drinking water.  The presence of contaminants does not necessarily indicate that the water poses a health risk”.

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