Water Treatment Plant Operator Practice Exam

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What is the maximum contaminant level (MCL) for haloacetic acids (HAA5)?

0.050 mg/L

0.060 mg/L

The maximum contaminant level (MCL) for haloacetic acids (HAA5) is established to protect public health by limiting the concentration of these byproducts formed during the disinfection of drinking water. The Environmental Protection Agency (EPA) has set the MCL for HAA5 at 0.060 mg/L. This limit is important because haloacetic acids can pose health risks, including potential carcinogenic effects when consumed over long periods.

Setting this limit at 0.060 mg/L means that water systems must monitor levels of these contaminants closely and take necessary actions to ensure that concentrations do not exceed this threshold. This regulation plays a crucial role in maintaining the safety and quality of drinking water for consumers.

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0.070 mg/L

0.080 mg/L

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