Water Distribution Operator Practice Questions - ABC WPI Water Distribution Operator Certification Exam (Grades 1-4) Exam

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What is the minimum free chlorine residual required in a water distribution system under the Safe Drinking Water Act (SDWA)?

0.0 mg/L — no minimum is federally mandated at the tap 0.2 mg/L detectable residual at the point of entry to the distribution system 0.5 mg/L at all points in the distribution system 1.0 mg/L at all sample points

Correct Answer:

0.2 mg/L detectable residual at the point of entry to the distribution system

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