New Mexico Water Operator Level 4 Practice Exam

What is the MCL for Arsenic in mg/l?

0.1 mg/L 0.05 mg/L 0.01 mg/L 0.001 mg/L

Correct Answer:

0.01 mg/L

Explanation:

The key idea is the enforceable limit set for drinking water, known as the maximum contaminant level (MCL). For arsenic, the current MCL is 0.01 mg/L, which equals 10 µg/L (or 10 parts per billion). This value was adopted to lower cancer risk from arsenic exposure; it is the regulatory standard today, replacing the older, higher limit. So the correct choice is 0.01 mg/L.

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