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Maximum Contaminant Level (MCL) is highest permissible level of a regulated contaminant. The MCL for TTHMs is 0.080 milligrams per liter (mg/L). This means that 1 mg/L is equivalent to 1 part per million (1 part per million would be equal to 1 penny out of $10,000). For more information please call 512-393-8010.