Frequent Questions

The Secondary Maximum Contaminant Level (SMCL) for aluminum indicates an acceptable range between 0.05 mg/l - 0.20mg/l. Why did EPA develop a range for this secondary contaminant, rather than a specific acceptable level?

While EPA encourages utilities to meet a level of 0.05mg/l for aluminum where possible, the Agency still believes that varying water quality and treatment situations necessitate a flexible approach to develop the SMCL. What may be appropriate in one case may not be appropriate in another. Hence, a range was developed for the aluminum SMCL (56 FR 3526, 3573; January 30, 1991).
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