The Power of Information

National Drinking Water Database

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

Serves 3,828,700 people


Perchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.
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
75 days
Tests ConductedNumber of individual tests done for this contaminant
100 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
PerchloratePerchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.0 ppb
0 ppb
5 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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 Perchlorate

Health Based Limits for Perchlorate

Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.5 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.6 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-310 ppb110 ppb
2009-03-240 ppb110 ppb
2009-03-170 ppb110 ppb
2009-03-100 ppb110 ppb
2009-03-030 ppb110 ppb
2009-01-130 ppb110 ppb
2008-12-090 ppb110 ppb
2008-11-130 ppb110 ppb
2008-11-110 ppb110 ppb
2008-10-140 ppb330 ppb
2008-09-090 ppb330 ppb
2008-08-120 ppb330 ppb
2008-07-150 ppb110 ppb
2008-06-100 ppb110 ppb
2008-05-130 ppb110 ppb
2008-04-150 ppb220 ppb
2008-02-120 ppb220 ppb
2008-01-150 ppb110 ppb
2007-12-110 ppb110 ppb
2007-11-130 ppb110 ppb
2007-11-070 ppb110 ppb
2007-10-090 ppb110 ppb
2007-09-110 ppb110 ppb
2007-08-280 ppb110 ppb
2007-08-140 ppb110 ppb
2007-07-100 ppb110 ppb
2007-06-120 ppb110 ppb
2007-05-150 ppb220 ppb
2007-04-100 ppb110 ppb
2007-02-130 ppb110 ppb
2007-02-070 ppb110 ppb
2006-12-120 ppb110 ppb
2006-11-140 ppb110 ppb
2006-11-020 ppb110 ppb
2006-10-100 ppb110 ppb
2006-09-120 ppb110 ppb
2006-06-130 ppb110 ppb
2006-05-110 ppb110 ppb
2006-05-090 ppb110 ppb
2006-04-110 ppb110 ppb
2005-12-130 ppb220 ppb
2005-11-150 ppb110 ppb
2005-11-020 ppb220 ppb
2005-10-110 ppb220 ppb
2005-08-090 ppb220 ppb
2005-08-030 ppb220 ppb
2005-07-120 ppb220 ppb
2005-06-140 ppb220 ppb
2005-05-180 ppb220 ppb
2005-05-100 ppb220 ppb
2005-04-120 ppb110 ppb
2005-03-220 ppb110 ppb
2005-03-150 ppb110 ppb
2005-02-150 ppb110 ppb
2005-02-100 ppb110 ppb
2005-01-110 ppb220 ppb
2004-12-140 ppb110 ppb
2004-11-090 ppb110 ppb
2004-11-030 ppb110 ppb
2004-10-120 ppb220 ppb
2004-09-140 ppb220 ppb
2004-08-120 ppb110 ppb
2004-08-110 ppb110 ppb
2004-08-100 ppb220 ppb
2004-07-130 ppb220 ppb
2004-06-150 ppb220 ppb
2004-06-100 ppb110 ppb
2004-05-180 ppb110 ppb
2004-05-110 ppb110 ppb
2004-04-130 ppb110 ppb
2004-03-090 ppb110 ppb
2004-02-240 ppb110 ppb
2004-02-230 ppb110 ppb
2004-02-110 ppb220 ppb
2004-01-130 ppb110 ppb