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Maximum Contaminant Levels: Cyanide

This page contains maximum contaminant levels for cyanide.

Drinking Water

Summary: Water is not safe to drink if cyanide exceeds 200 µg/L (micrograms per cubic liter).

EPA: 200 µg/L MCL - U.S. EPA2

California: 200 µg/L before 6/2003, 150 µg/L after 6/2003 MCL - The California Department of Public Health.2
The California Department of Public Health changed the acceptable cyanide levels from 200 µg/L to 150 µg/L in June, 2003.2

Colorado: 200 µg/L MCL - Colorado Department of Public Health and Environment1

 

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