The Power of Information

National Drinking Water Database

Metropolitan Water District of Southern California Utilities - Los Angeles, CA

Serves 17,000,000 people

Chromium (hexavalent)

Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
0 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
46 days
Tests ConductedNumber of individual tests done for this contaminant
162 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Chromium (hexavalent)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.0.09 ppb
0.41 ppb
100 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Chromium (hexavalent)

Health Based Limits for Chromium (hexavalent)

Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.100 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-01-120.16 ppb600.04 to 0.37 ppb
2009-01-050 ppb220 ppb
2008-10-130.21 ppb600.09 to 0.38 ppb
2008-10-060 ppb220 ppb
2008-07-140.28 ppb600.12 to 0.51 ppb
2008-07-070 ppb110 ppb
2008-04-140.41 ppb600.24 to 0.73 ppb
2008-04-090.13 ppb100.13 ppb
2008-04-070 ppb110 ppb
2008-01-300.41 ppb600.19 to 1.04 ppb
2008-01-070 ppb110 ppb
2007-10-310.21 ppb600.11 to 0.39 ppb
2007-10-010 ppb220 ppb
2007-07-310.14 ppb600.1 to 0.17 ppb
2007-07-020 ppb220 ppb
2007-04-300.1 ppb600.05 to 0.19 ppb
2007-04-020.02 ppb210 to 0.03 ppb
2007-01-310.08 ppb600.04 to 0.1 ppb
2007-01-030 ppb110 ppb
2006-11-010.07 ppb100.07 ppb
2006-10-310.08 ppb500.06 to 0.12 ppb
2006-10-020 ppb110 ppb
2006-07-310.08 ppb600.07 to 0.1 ppb
2006-07-050 ppb110 ppb
2006-04-300.09 ppb600.07 to 0.1 ppb
2006-04-030.06 ppb820 to 0.1 ppb
2006-01-310.08 ppb600.04 to 0.12 ppb
2006-01-030 ppb220 ppb
2005-10-100.06 ppb100.06 ppb
2005-10-030.06 ppb720 to 0.1 ppb
2005-07-310.1 ppb600.05 to 0.15 ppb
2005-07-050 ppb110 ppb
2005-04-110 ppb110 ppb
2005-04-040.11 ppb600.07 to 0.15 ppb
2005-01-310.14 ppb600.09 to 0.18 ppb
2005-01-030 ppb110 ppb
2004-10-310.26 ppb500.09 to 0.59 ppb
2004-10-290.33 ppb100.33 ppb
2004-10-040 ppb110 ppb
2004-07-310.13 ppb600.08 to 0.28 ppb
2004-07-060 ppb110 ppb
2004-04-300.09 ppb600.07 to 0.12 ppb
2004-04-050.08 ppb100.08 ppb
2004-01-310.09 ppb500.06 to 0.12 ppb
2004-01-300.11 ppb100.11 ppb
2004-01-050 ppb110 ppb