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Maximum Contaminant Levels: Cadmium

This page contains maximum contaminant levels for cadmium.

Drinking Water

Summary: Water is not safe to drink if cadmium exceeds 4 µg/L (micrograms per cubic liter).

EPA: 10 µg/L before 1/91, 5 µg/L after 1/91 MCL - U.S. EPA2
The U.S. EPA changed the acceptable cadmium levels from 10 µg/L to 5 µg/L in January, 1991.2

California: 10 µg/L before 9/94, 5 µg/L after 9/94 MCL - The California Department of Public Health.2
The The California Department of Public Health changed the acceptable cadmium levels from 10 µg/L to 5 µg/L in September, 1994.2

Colorado: 5 µg/L MCL - Colorado Department of Public Health and Environment1

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