What are the differences between an MCL (maximum contaminant level) and an MCLG (maximum contaminant level goal) in terms of public health?

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What are the differences between an MCL (maximum contaminant level) and an MCLG (maximum contaminant level goal) in terms of public health?

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MCLs are enforceable numerical limits that restrict the concentration of specific contaminants in the nation’s drinking water. An MCLG is a non-enforceable goal derived solely from health effects data. An MCL is set as closely as possible to the MCLG, taking technology and costs into account.

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