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Home » Resources » Maximum Contaminant Levels » Iron

Maximum Contaminant Levels: Iron

This page contains maximum contaminant levels for iron.

Drinking Water

Summary: Water is not safe to drink if iron exceeds 300 µg/L (micrograms per cubic liter).

Colorado: 300 µg/L SMCL - Colorado Department of Public Health and Environment¹

Secondary MCL (SMCL) - This basically means that they don't consider iron dangerous. We believe the research is clear. Manganese is harmful at elevated levels and should be placed on the MCL list.