The Power of Information

National Drinking Water Database


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


Serves 3,828,700 people

Bromate

Bromate is a carcinogenic disinfection byproduct of ozonation formed when source waters contain high levels of natural bromide; it can also form following water treatment with chlorine dioxide or hypochlorite.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
41 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
84 days
Tests ConductedNumber of individual tests done for this contaminant
85 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
BromateBromate is a carcinogenic disinfection byproduct of ozonation formed when source waters contain high levels of natural bromide; it can also form following water treatment with chlorine dioxide or hypochlorite.0.24 ppb
7.38 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
10 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 Bromate

Health Based Limits for Bromate

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.0.05 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.5 ppb
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.10 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.140 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.200 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-01-290 ppb110 ppb
2009-01-270 ppb110 ppb
2009-01-220 ppb110 ppb
2009-01-200 ppb110 ppb
2009-01-150 ppb110 ppb
2009-01-130 ppb110 ppb
2009-01-080 ppb110 ppb
2009-01-060 ppb110 ppb
2008-12-300 ppb110 ppb
2008-12-230 ppb110 ppb
2008-12-180 ppb110 ppb
2008-12-160 ppb110 ppb
2008-12-09<0.01 ppb10< .01 to 0.005 ppb
2008-12-02<0.01 ppb10< .01 to 0.006 ppb
2008-11-250 ppb110 ppb
2008-11-200 ppb110 ppb
2008-11-180 ppb110 ppb
2008-11-130 ppb110 ppb
2008-11-11<0.01 ppb10< .01 to 0.007 ppb
2008-11-060 ppb110 ppb
2008-11-04<0.01 ppb10< .01 to 0.008 ppb
2008-10-300 ppb110 ppb
2008-10-280 ppb110 ppb
2008-10-240 ppb110 ppb
2008-10-237.16 ppb107.16 ppb
2008-10-227.38 ppb107.38 ppb
2008-10-210 ppb110 ppb
2008-10-200 ppb110 ppb
2008-10-140 ppb110 ppb
2008-10-090 ppb220 ppb
2008-10-080 ppb110 ppb
2008-10-070 ppb110 ppb
2008-10-025.06 ppb105.06 ppb
2008-10-010 ppb110 ppb
2008-09-300 ppb110 ppb
2008-09-23<0.01 ppb10< .01 to 0.005 ppb
2008-09-16<0.01 ppb10< .01 to 0.006 ppb
2008-09-090 ppb110 ppb
2008-09-040 ppb110 ppb
2008-08-010 ppb110 ppb
2008-06-24<0.01 ppb10< .01 to 0.007 ppb
2008-06-100 ppb110 ppb
2008-06-030 ppb110 ppb
2008-03-270 ppb110 ppb
2008-03-18<0.01 ppb10< .01 to 0.006 ppb
2008-03-11<0.01 ppb10< .01 to 0.005 ppb
2008-03-04<0.01 ppb10< .01 to 0.005 ppb
2008-02-260.01 ppb100.01 ppb
2008-02-19<0.01 ppb10< .01 to 0.009 ppb
2008-02-12<0.01 ppb10< .01 to 0.008 ppb
2008-02-05<0.01 ppb10< .01 to 0.007 ppb
2008-01-31<0.01 ppb10< .01 to 0.008 ppb
2008-01-220.01 ppb100.01 ppb
2008-01-15<0.01 ppb10< .01 to 0.007 ppb
2008-01-08<0.01 ppb10< .01 to 0.006 ppb
2008-01-01<0.01 ppb10< .01 to 0.006 ppb
2007-12-25<0.01 ppb10< .01 to 0.007 ppb
2007-12-18<0.01 ppb10< .01 to 0.006 ppb
2007-12-11<0.01 ppb10< .01 to 0.007 ppb
2007-12-04<0.01 ppb10< .01 to 0.007 ppb
2007-11-30<0.01 ppb10< .01 to 0.007 ppb
2007-11-270 ppb110 ppb
2007-11-23<0.01 ppb10< .01 to 0.006 ppb
2007-11-20<0.01 ppb10< .01 to 0.005 ppb
2007-11-15<0.01 ppb10< .01 to 0.006 ppb
2007-11-13<0.01 ppb10< .01 to 0.007 ppb
2007-11-08<0.01 ppb10< .01 to 0.007 ppb
2007-11-01<0.01 ppb10< .01 to 0.007 ppb
2007-10-31<0.01 ppb10< .01 to 0.007 ppb
2007-10-30<0.01 ppb10< .01 to 0.007 ppb
2007-10-29<0.01 ppb10< .01 to 0.008 ppb
2007-10-27<0.01 ppb10< .01 to 0.008 ppb
2007-10-26<0.01 ppb10< .01 to 0.008 ppb
2007-10-25<0.01 ppb10< .01 to 0.009 ppb
2007-10-24<0.01 ppb10< .01 to 0.009 ppb
2007-10-230.01 ppb100.01 ppb
2007-10-180 ppb110 ppb
2007-10-170 ppb110 ppb
2007-10-160 ppb110 ppb
2007-10-150 ppb110 ppb
2007-10-140 ppb110 ppb
2007-10-130 ppb110 ppb
2007-10-120 ppb110 ppb
2007-10-110 ppb110 ppb