Water Treatment Plant Operator Practice Questions - Water Treatment Plant Operator Certification Exam

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Under the SDWA, what is the difference between a Maximum Contaminant Level (MCL) and a Maximum Contaminant Level Goal (MCLG)?

There is no difference; the terms are interchangeable. An MCL is an enforceable standard, while an MCLG is a non-enforceable health goal. An MCLG is an enforceable standard, while an MCL is a non-enforceable health goal. MCLs apply to surface water, while MCLGs apply to groundwater.

Correct Answer:

An MCL is an enforceable standard, while an MCLG is a non-enforceable health goal.

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