Florida Drinking Water Operator "B" Practice Test

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What is the Maximum Contaminant Level (MCL) for manganese?

  1. 0.01 mg/l

  2. 0.05 mg/l

  3. 0.1 mg/l

  4. 0.15 mg/l

The correct answer is: 0.05 mg/l

The Maximum Contaminant Level (MCL) for manganese is established to ensure safe drinking water quality and protect public health. Manganese is naturally occurring and can enter drinking water sources through geological formations and human activities such as mining. It can pose health risks if consumed in significant quantities over time, particularly affecting neurological development in children. Setting the MCL for manganese at 0.05 mg/l reflects the consensus within regulatory frameworks that aim to prevent potential adverse health effects. The level is based on research that evaluates both the potential toxicological effects of manganese and the need to balance it against the typical concentrations found in the environment. By maintaining this MCL, water treatment facilities can ensure that manganese concentrations are kept at safe levels for consumers, helping to avoid health complications associated with higher exposure levels.

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