Frequent Questions

What is a drinking water standard?

Under the authority of the Safe Drinking Water Act (SDWA), EPA set standards for approximately 90 contaminants in drinking water. For each of these contaminants, EPA sets a legal limit, called a maximum contaminant level, or requires a certain treatment. Water suppliers may not provide water that doesn?t meet these standards. Water that meets these standards is safe to drink, although people with severely compromised immune systems and children may have special needs. For a more detailed description, read about how standards are set at
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