Question 4004 of 229 · California Water Distribution Operator Exam
What is the maximum residual disinfectant level (MRDL) for chlorine in the federal rule?
Exactly one answer is correct.
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Correct answer to question 4004
- A: 4.0 mg/L as Cl2
Explanation
The MRDL is a running annual average of 4.0 mg/L for chlorine and chloramines. It is far above the typical residual of 0.2 to 2 mg/L.
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