Florida Drinking Water Operator "B" Practice Test

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What is the MCL for nitrate in drinking water?

  1. 5 mg/l

  2. 10 mg/l

  3. 15 mg/l

  4. 20 mg/l

The correct answer is: 10 mg/l

The maximum contaminant level (MCL) for nitrate in drinking water is established to protect public health, especially vulnerable populations such as pregnant women and infants. The standard MCL for nitrate, expressed as nitrate-nitrogen (N), is set at 10 mg/l according to the U.S. Environmental Protection Agency (EPA) regulations. Nitrate can affect the ability of blood to carry oxygen in infants, a condition known as methemoglobinemia or "blue baby syndrome." This level is designed to ensure safety and to minimize health risks associated with high nitrate concentrations in drinking water sources. Maintaining this standard helps safeguard public health and ensures that water supplies remain safe for consumption.

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