The Power of Information

National Drinking Water Database

Los Angeles Department of Water and Power Utilities - Los Angeles, CA

Serves 3,828,700 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
95 days
Tests ConductedNumber of individual tests done for this contaminant
133 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.2.84 ppb
33.7 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
2009-03-182.87 ppb102.87 ppb
2009-01-261.26 ppb101.26 ppb
2008-12-181.04 ppb101.04 ppb
2008-11-201.2 ppb101.2 ppb
2008-10-230 ppb110 ppb
2008-10-200 ppb110 ppb
2008-09-180 ppb110 ppb
2008-09-150 ppb110 ppb
2008-08-283.07 ppb103.07 ppb
2008-07-283.03 ppb103.03 ppb
2008-06-190 ppb110 ppb
2008-05-203.16 ppb103.16 ppb
2008-03-201.57 ppb210 to 3.13 ppb
2008-02-210 ppb110 ppb
2008-02-120 ppb110 ppb
2008-01-2931.8 ppb1031.8 ppb
2008-01-240 ppb110 ppb
2007-12-263.01 ppb103.01 ppb
2007-12-200 ppb110 ppb
2007-12-170 ppb110 ppb
2007-11-220 ppb110 ppb
2007-10-181.7 ppb101.7 ppb
2007-09-200.76 ppb210 to 1.51 ppb
2007-08-241.35 ppb101.35 ppb
2007-07-191.39 ppb101.39 ppb
2007-07-173.54 ppb103.54 ppb
2007-07-160 ppb110 ppb
2007-06-292.37 ppb102.37 ppb
2007-06-211.02 ppb101.02 ppb
2007-06-180 ppb110 ppb
2007-05-241.28 ppb101.28 ppb
2007-05-210 ppb110 ppb
2007-04-122.3 ppb201.21 to 3.38 ppb
2007-04-110 ppb110 ppb
2007-03-281.3 ppb101.3 ppb
2007-02-231.69 ppb210 to 3.38 ppb
2007-02-221.31 ppb101.31 ppb
2007-02-201.31 ppb101.31 ppb
2007-02-0625.5 ppb1025.5 ppb
2007-01-310.68 ppb210 to 1.35 ppb
2007-01-1833.7 ppb1033.7 ppb
2006-12-1425.9 ppb1025.9 ppb
2006-12-131.66 ppb101.66 ppb
2006-11-1628.5 ppb1028.5 ppb
2006-11-020 ppb110 ppb
2006-11-010 ppb110 ppb
2006-10-250.99 ppb310 to 1.49 ppb
2006-10-1817.6 ppb1017.6 ppb
2006-09-261.45 ppb101.45 ppb
2006-09-144.63 ppb310 to 12.9 ppb
2006-08-2410.6 ppb1010.6 ppb
2006-08-230.72 ppb210 to 1.43 ppb
2006-07-260.92 ppb210 to 1.84 ppb
2006-07-198.33 ppb108.33 ppb
2006-06-201.31 ppb101.31 ppb
2006-05-110 ppb110 ppb
2006-05-100 ppb110 ppb
2006-04-251.21 ppb101.21 ppb
2006-04-180.81 ppb310 to 1.21 ppb
2006-03-280 ppb220 ppb
2006-02-270 ppb220 ppb
2006-02-140.53 ppb210 to 1.05 ppb
2005-12-290 ppb220 ppb
2005-11-290 ppb220 ppb
2005-11-020 ppb220 ppb
2005-10-120 ppb220 ppb
2005-08-300.54 ppb210 to 1.08 ppb
2005-08-030.72 ppb210 to 1.44 ppb
2005-07-260.75 ppb210 to 1.5 ppb
2005-06-280 ppb220 ppb
2005-05-240.65 ppb210 to 1.3 ppb
2005-05-180.64 ppb210 to 1.28 ppb
2005-04-260 ppb110 ppb
2005-03-220 ppb110 ppb
2005-02-220 ppb110 ppb
2005-02-100 ppb110 ppb
2005-01-260.62 ppb210 to 1.24 ppb
2004-12-280 ppb220 ppb
2004-11-290 ppb220 ppb
2004-11-030 ppb110 ppb
2004-10-270.84 ppb210 to 1.68 ppb
2004-09-291.04 ppb210 to 2.08 ppb
2004-08-300.91 ppb210 to 1.81 ppb
2004-08-255.21 ppb105.21 ppb
2004-08-121.23 ppb101.23 ppb
2004-08-110 ppb110 ppb
2004-07-280.94 ppb210 to 1.88 ppb
2004-06-280.84 ppb210 to 1.68 ppb
2004-06-255.57 ppb105.57 ppb
2004-05-250 ppb220 ppb
2004-05-180 ppb110 ppb
2004-04-261.91 ppb320 to 5.72 ppb
2004-03-300.55 ppb210 to 1.1 ppb
2004-03-183.17 ppb103.17 ppb
2004-01-285.1 ppb105.1 ppb