The Power of Information

National Drinking Water Database

Pomona - City, Water Dept. Utilities - Los Angeles, CA

Serves 156,500 people


Atrazine is an endocrine-disrupting herbicide used on corn, sugarcane and sorghum; it is associated with adverse reproductive effects and toxicity to the immune system.
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
34 days
Tests ConductedNumber of individual tests done for this contaminant
45 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
AtrazineAtrazine is an endocrine-disrupting herbicide used on corn, sugarcane and sorghum; it is associated with adverse reproductive effects and toxicity to the immune system.0 ppb
0 ppb
0.15 ppb
3 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 Atrazine

Health Based Limits for Atrazine

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.0.15 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.3 ppb
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.3 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.700 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2008-09-030 ppb110 ppb
2008-08-130 ppb110 ppb
2008-08-070 ppb110 ppb
2008-08-050 ppb550 ppb
2008-06-170 ppb110 ppb
2008-05-280 ppb110 ppb
2008-05-140 ppb110 ppb
2008-05-070 ppb110 ppb
2008-04-070 ppb110 ppb
2008-03-050 ppb110 ppb
2008-03-040 ppb110 ppb
2007-05-010 ppb110 ppb
2006-10-180 ppb330 ppb
2006-10-120 ppb110 ppb
2006-08-080 ppb110 ppb
2006-07-200 ppb110 ppb
2006-06-200 ppb110 ppb
2006-06-130 ppb220 ppb
2006-06-080 ppb110 ppb
2006-06-060 ppb110 ppb
2006-05-160 ppb110 ppb
2006-05-110 ppb110 ppb
2006-05-100 ppb220 ppb
2006-05-090 ppb220 ppb
2006-05-040 ppb110 ppb
2006-05-020 ppb110 ppb
2006-04-110 ppb110 ppb
2005-07-250 ppb110 ppb
2005-06-160 ppb220 ppb
2005-06-080 ppb110 ppb
2005-05-260 ppb220 ppb
2005-05-100 ppb110 ppb
2005-05-040 ppb110 ppb
2005-04-120 ppb110 ppb