What is an MCL?

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Multiple Choice

What is an MCL?

An MCL is the maximum level of a contaminant that is allowed in drinking water. It’s an enforceable standard set by the EPA under the Safe Drinking Water Act, meant to protect public health while reflecting what water systems can realistically achieve with available treatment. Utilities must keep contaminant levels at or below this limit, and exceeding it triggers regulatory actions to fix the issue. It’s different from an MCL Goal, which is a health-based target not enforceable, and from a maximum residual disinfectant level, which applies specifically to disinfectants rather than general contaminants.

An MCL is the maximum level of a contaminant that is allowed in drinking water. It’s an enforceable standard set by the EPA under the Safe Drinking Water Act, meant to protect public health while reflecting what water systems can realistically achieve with available treatment. Utilities must keep contaminant levels at or below this limit, and exceeding it triggers regulatory actions to fix the issue. It’s different from an MCL Goal, which is a health-based target not enforceable, and from a maximum residual disinfectant level, which applies specifically to disinfectants rather than general contaminants.

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