The Power of Information

National Drinking Water Database

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

Serves 3,828,700 people

Nitrate & nitrite

Nitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, 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
137 days
Tests ConductedNumber of individual tests done for this contaminant
143 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Nitrate & nitriteNitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.0.11 ppm
3.52 ppm
10 ppm
10 ppm
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 Nitrate & nitrite

Health Based Limits for Nitrate & nitrite

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 ppm
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.10 ppm
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.10 ppm

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-01-290 ppm110 ppm
2009-01-220 ppm110 ppm
2009-01-150 ppm110 ppm
2009-01-130 ppm110 ppm
2009-01-080 ppm110 ppm
2009-01-060 ppm110 ppm
2008-12-300 ppm110 ppm
2008-12-230 ppm110 ppm
2008-12-180 ppm110 ppm
2008-12-160 ppm110 ppm
2008-12-090 ppm110 ppm
2008-12-020 ppm110 ppm
2008-11-250 ppm110 ppm
2008-11-200 ppm110 ppm
2008-11-180 ppm110 ppm
2008-11-130 ppm110 ppm
2008-11-110 ppm110 ppm
2008-11-040 ppm110 ppm
2008-10-280 ppm110 ppm
2008-10-210 ppm110 ppm
2008-10-140 ppm110 ppm
2008-10-070 ppm110 ppm
2008-09-300 ppm110 ppm
2008-09-230 ppm110 ppm
2008-09-160 ppm110 ppm
2008-09-090 ppm110 ppm
2008-09-040 ppm110 ppm
2008-08-120 ppm110 ppm
2008-02-260 ppm110 ppm
2008-02-190 ppm110 ppm
2008-02-120 ppm220 ppm
2008-02-050 ppm110 ppm
2008-01-310 ppm110 ppm
2008-01-220 ppm110 ppm
2008-01-150 ppm110 ppm
2008-01-080 ppm110 ppm
2008-01-01<0.01 ppm10< .01 to 0.00063 ppm
2007-12-250 ppm110 ppm
2007-12-180 ppm110 ppm
2007-12-110 ppm110 ppm
2007-12-040 ppm110 ppm
2007-11-300 ppm110 ppm
2007-11-270 ppm110 ppm
2007-11-230 ppm110 ppm
2007-11-220 ppm110 ppm
2007-11-200 ppm110 ppm
2007-11-150 ppm110 ppm
2007-11-130 ppm110 ppm
2007-11-080 ppm110 ppm
2007-11-07<0.01 ppm10< .01 to 0.0005 ppm
2007-11-060 ppm110 ppm
2007-11-010 ppm110 ppm
2007-10-310 ppm110 ppm
2007-10-300 ppm110 ppm
2007-10-290 ppm110 ppm
2007-10-280 ppm110 ppm
2007-10-270 ppm110 ppm
2007-10-260 ppm110 ppm
2007-10-250 ppm110 ppm
2007-10-240 ppm110 ppm
2007-10-230 ppm110 ppm
2007-10-220 ppm110 ppm
2007-10-180 ppm110 ppm
2007-10-170 ppm110 ppm
2007-10-160 ppm110 ppm
2007-10-140 ppm110 ppm
2007-10-130 ppm110 ppm
2007-10-110 ppm110 ppm
2007-10-090 ppm110 ppm
2007-10-020 ppm110 ppm
2007-09-250 ppm110 ppm
2007-09-180 ppm110 ppm
2007-09-110 ppm110 ppm
2007-09-040 ppm110 ppm
2007-08-280 ppm220 ppm
2007-08-210 ppm110 ppm
2007-08-140 ppm110 ppm
2007-08-070 ppm110 ppm
2007-07-310 ppm110 ppm
2007-07-240 ppm110 ppm
2007-07-170 ppm110 ppm
2007-07-100 ppm110 ppm
2007-07-030 ppm110 ppm
2007-06-260 ppm110 ppm
2007-06-210 ppm110 ppm
2007-06-190 ppm110 ppm
2007-06-120 ppm110 ppm
2007-06-050 ppm110 ppm
2007-05-220 ppm110 ppm
2007-05-150 ppm220 ppm
2007-05-080 ppm110 ppm
2007-05-010 ppm110 ppm
2007-04-240 ppm110 ppm
2007-04-170 ppm110 ppm
2007-04-100 ppm110 ppm
2007-04-030 ppm110 ppm
2007-02-270 ppm110 ppm
2007-02-200 ppm110 ppm
2007-02-130 ppm110 ppm
2007-02-070 ppm110 ppm
2007-02-060 ppm110 ppm
2006-12-260 ppm110 ppm
2006-12-190 ppm110 ppm
2006-12-130 ppm110 ppm
2006-12-120 ppm110 ppm
2006-12-050 ppm110 ppm
2006-11-280 ppm110 ppm
2006-11-210 ppm110 ppm
2006-11-140 ppm110 ppm
2006-11-070 ppm110 ppm
2006-11-020 ppm110 ppm
2006-10-310 ppm110 ppm
2006-10-250 ppm110 ppm
2006-10-240 ppm110 ppm
2006-10-170 ppm110 ppm
2006-10-100 ppm110 ppm
2006-09-260 ppm110 ppm
2006-09-190 ppm110 ppm
2006-09-120 ppm110 ppm
2006-09-050 ppm110 ppm
2006-06-270 ppm110 ppm
2006-06-200 ppm110 ppm
2006-06-130 ppm110 ppm
2006-06-060 ppm110 ppm
2006-05-110 ppm110 ppm
2006-05-090 ppm110 ppm
2006-04-110 ppm110 ppm
2005-11-020.24 ppm210 to 0.48 ppm
2005-08-031.55 ppm200.83 to 2.27 ppm
2005-05-181.69 ppm201.26 to 2.12 ppm
2005-02-101.16 ppm101.16 ppm
2004-11-030.9 ppm100.9 ppm
2004-08-122.79 ppm102.79 ppm
2004-08-111.25 ppm101.25 ppm
2004-05-180.57 ppm100.57 ppm
2004-02-243.52 ppm103.52 ppm
2004-02-231.3 ppm101.3 ppm