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Maximum Contaminant Levels: Lead

This page contains maximum contaminant levels for lead.

Drinking Water

Summary: Water is not safe to drink if lead exceeds 50 µg/L (micrograms per cubic liter).

EPA: 50 µg/L MCL before 6/1991, 15 µg/L MCL after 6/1991 - U.S. EPA2
The U.S. EPA changed acceptable lead levels from 50 µg/L to 15 µg/L in June, 1991.2

California: 50 µg/L before 12/1995, 15 µg/L after 12/1995 MCL - The California Department of Public Health.2
The California Department of Public Health changed acceptable lead levels from 50 µg/L to 15 µg/L in December, 1995.2

Colorado: 15 µg/L AL - Colorado Department of Public Health and Environment1
Action Level (AL) - This indicates a serious threat. Action can be taken to enfore public safety when lead is found at these levels.

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