The Power of Information

National Drinking Water Database


San Gabriel Valley WC - Fontana Utilities - Los Angeles, CA


Serves 102,599 people

Perchlorate

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
43 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
184 days
Tests ConductedNumber of individual tests done for this contaminant
519 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

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.4.54 ppb
21 ppb
Yes
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

StandardDescriptionLevel
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
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-100 ppb110 ppb
2009-03-090 ppb330 ppb
2009-02-190 ppb110 ppb
2009-02-180 ppb24240 ppb
2009-02-110 ppb110 ppb
2009-01-299.3 ppb109.3 ppb
2009-01-219.4 ppb109.4 ppb
2009-01-152.35 ppb201.4 to 3.3 ppb
2008-12-035.75 ppb201.5 to 10 ppb
2008-11-265.85 ppb202 to 9.7 ppb
2008-11-195.9 ppb201.8 to 10 ppb
2008-11-125.45 ppb201.7 to 9.2 ppb
2008-11-055.8 ppb201.7 to 9.9 ppb
2008-10-296.4 ppb201.8 to 11 ppb
2008-10-226.65 ppb201.3 to 12 ppb
2008-10-084.43 ppb200.96 to 7.9 ppb
2008-10-070 ppb330 ppb
2008-10-014.25 ppb201.1 to 7.4 ppb
2008-09-244.47 ppb200.93 to 8 ppb
2008-09-174.57 ppb200.84 to 8.3 ppb
2008-09-104.1 ppb210 to 8.2 ppb
2008-09-034.1 ppb210 to 8.2 ppb
2008-08-273.05 ppb210 to 6.1 ppb
2008-08-206.17 ppb400.97 to 14 ppb
2008-08-133.9 ppb210 to 7.8 ppb
2008-08-063.6 ppb210 to 7.2 ppb
2008-07-303.95 ppb210 to 7.9 ppb
2008-07-233.85 ppb210 to 7.7 ppb
2008-07-165.3 ppb202.3 to 8.3 ppb
2008-07-154.6 ppb410 to 10 ppb
2008-07-095.25 ppb201.9 to 8.6 ppb
2008-07-081.07 ppb24160 to 7.9 ppb
2008-07-025 ppb201.9 to 8.1 ppb
2008-06-254.9 ppb201.7 to 8.1 ppb
2008-06-184.65 ppb201.1 to 8.2 ppb
2008-06-114.35 ppb200.99 to 7.7 ppb
2008-06-044.48 ppb200.95 to 8 ppb
2008-05-284.05 ppb210 to 8.1 ppb
2008-05-213.7 ppb210 to 7.4 ppb
2008-05-144.65 ppb201.5 to 7.8 ppb
2008-05-075.3 ppb201.8 to 8.8 ppb
2008-04-304.65 ppb210 to 9.3 ppb
2008-04-234.26 ppb200.91 to 7.6 ppb
2008-04-163.75 ppb210 to 7.5 ppb
2008-04-094.88 ppb200.96 to 8.8 ppb
2008-04-083.65 ppb210 to 7.3 ppb
2008-04-034.25 ppb210 to 8.5 ppb
2008-04-025 ppb210 to 10 ppb
2008-03-263.65 ppb210 to 7.3 ppb
2008-03-194.55 ppb201.8 to 7.3 ppb
2008-03-128.72 ppb300.57 to 16 ppb
2008-03-054.6 ppb210 to 9.2 ppb
2008-02-274.65 ppb210 to 9.3 ppb
2008-02-203.3 ppb210 to 6.6 ppb
2008-02-133.65 ppb210 to 7.3 ppb
2008-02-062.4 ppb320 to 7.2 ppb
2008-01-304.35 ppb210 to 8.7 ppb
2008-01-232.47 ppb320 to 7.4 ppb
2008-01-163.6 ppb210 to 7.2 ppb
2008-01-091.21 ppb850 to 7.2 ppb
2008-01-080.64 ppb22160 to 7 ppb
2008-01-034.38 ppb520 to 12 ppb
2007-12-273.35 ppb210 to 6.7 ppb
2007-12-193.3 ppb210 to 6.6 ppb
2007-12-123.65 ppb210 to 7.3 ppb
2007-12-055.4 ppb203.9 to 6.9 ppb
2007-11-214.45 ppb202.1 to 6.8 ppb
2007-11-144.3 ppb202.1 to 6.5 ppb
2007-11-072.5 ppb210 to 5 ppb
2007-10-314.7 ppb201.8 to 7.6 ppb
2007-10-249.6 ppb109.6 ppb
2007-10-173.55 ppb210 to 7.1 ppb
2007-10-104.35 ppb201.8 to 6.9 ppb
2007-10-033.05 ppb210 to 6.1 ppb
2007-09-265.5 ppb201.5 to 9.5 ppb
2007-09-194.05 ppb201.3 to 6.8 ppb
2007-09-123.75 ppb201.2 to 6.3 ppb
2007-09-054.2 ppb210 to 8.4 ppb
2007-08-294 ppb310 to 10 ppb
2007-08-223.45 ppb210 to 6.9 ppb
2007-08-160 ppb220 ppb
2007-08-154.9 ppb520 to 11 ppb
2007-08-084.45 ppb210 to 8.9 ppb
2007-08-013.81 ppb200.32 to 7.3 ppb
2007-07-253.45 ppb210 to 6.9 ppb
2007-07-183.7 ppb210 to 7.4 ppb
2007-07-113.15 ppb210 to 6.3 ppb
2007-07-053.75 ppb210 to 7.5 ppb
2007-06-273.65 ppb210 to 7.3 ppb
2007-06-203.6 ppb210 to 7.2 ppb
2007-06-150 ppb440 ppb
2007-06-133.85 ppb210 to 7.7 ppb
2007-06-063.65 ppb210 to 7.3 ppb
2007-05-233.05 ppb210 to 6.1 ppb
2007-05-162.95 ppb210 to 5.9 ppb
2007-05-094.2 ppb210 to 8.4 ppb
2007-05-023.75 ppb210 to 7.5 ppb
2007-04-254.98 ppb410 to 7.8 ppb
2007-04-183.8 ppb210 to 7.6 ppb
2007-04-113.55 ppb210 to 7.1 ppb
2007-04-043.35 ppb210 to 6.7 ppb
2007-03-287.37 ppb310 to 13 ppb
2007-03-213.9 ppb210 to 7.8 ppb
2007-03-144 ppb210 to 8 ppb
2007-03-074.25 ppb210 to 8.5 ppb
2007-02-283.95 ppb210 to 7.9 ppb
2007-02-143.5 ppb210 to 7 ppb
2007-02-090 ppb110 ppb
2007-02-074.55 ppb210 to 9.1 ppb
2007-01-313.2 ppb210 to 6.4 ppb
2007-01-244.8 ppb210 to 9.6 ppb
2007-01-174.8 ppb210 to 9.6 ppb
2007-01-155.03 ppb305 to 5.1 ppb
2007-01-084.5 ppb210 to 9 ppb
2007-01-035 ppb210 to 10 ppb
2006-12-276.3 ppb1205.3 to 7.2 ppb
2006-12-266 ppb210 to 12 ppb
2006-12-220 ppb110 ppb
2006-12-210 ppb110 ppb
2006-12-205.5 ppb210 to 11 ppb
2006-12-124.4 ppb210 to 8.8 ppb
2006-12-064.65 ppb210 to 9.3 ppb
2006-12-050 ppb12120 ppb
2006-11-294.9 ppb210 to 9.8 ppb
2006-11-204.6 ppb210 to 9.2 ppb
2006-11-154.5 ppb210 to 9 ppb
2006-11-084.75 ppb210 to 9.5 ppb
2006-11-014.8 ppb210 to 9.6 ppb
2006-10-255.5 ppb210 to 11 ppb
2006-10-185 ppb210 to 10 ppb
2006-10-115.5 ppb210 to 11 ppb
2006-10-044.3 ppb210 to 8.6 ppb
2006-09-274.65 ppb210 to 9.3 ppb
2006-09-193.7 ppb210 to 7.4 ppb
2006-09-114.4 ppb210 to 8.8 ppb
2006-09-064.4 ppb210 to 8.8 ppb
2006-08-294.4 ppb210 to 8.8 ppb
2006-08-224.2 ppb210 to 8.4 ppb
2006-08-164.3 ppb210 to 8.6 ppb
2006-08-089.75 ppb1108.9 to 10 ppb
2006-08-074.6 ppb210 to 9.2 ppb
2006-08-029.48 ppb610 to 12 ppb
2006-08-0112.86 ppb7011 to 16 ppb
2006-07-3116 ppb3016 ppb
2006-07-263.95 ppb210 to 7.9 ppb
2006-07-194.5 ppb210 to 9 ppb
2006-07-124.15 ppb210 to 8.3 ppb
2006-07-054.2 ppb210 to 8.4 ppb
2006-06-284.5 ppb210 to 9 ppb
2006-06-214.05 ppb210 to 8.1 ppb
2006-06-154.1 ppb210 to 8.2 ppb
2006-06-074.15 ppb210 to 8.3 ppb
2006-05-314.25 ppb210 to 8.5 ppb
2006-05-244.45 ppb210 to 8.9 ppb
2006-05-175 ppb210 to 10 ppb
2006-05-115.5 ppb210 to 11 ppb
2006-05-034.5 ppb210 to 9 ppb
2006-04-263.75 ppb210 to 7.5 ppb
2006-04-183.8 ppb210 to 7.6 ppb
2006-04-124.45 ppb210 to 8.9 ppb
2006-04-064.3 ppb210 to 8.6 ppb
2006-03-290.42 ppb19180 to 7.9 ppb
2006-03-223.55 ppb210 to 7.1 ppb
2006-03-156 ppb210 to 12 ppb
2006-03-086 ppb210 to 12 ppb
2006-03-0211 ppb1011 ppb
2006-03-010 ppb110 ppb
2006-02-226 ppb210 to 12 ppb
2006-02-156.5 ppb210 to 13 ppb
2006-02-096.5 ppb210 to 13 ppb
2006-01-257 ppb210 to 14 ppb
2006-01-186.5 ppb210 to 13 ppb
2005-12-215.6 ppb310 to 14 ppb
2005-12-150 ppb110 ppb
2005-12-133.1 ppb103.1 ppb
2005-12-050 ppb440 ppb
2005-11-0115 ppb1015 ppb
2005-09-2212 ppb2010 to 14 ppb
2005-08-174.85 ppb210 to 9.7 ppb
2005-07-259.55 ppb809 to 11 ppb
2005-07-0121 ppb8019 to 24 ppb
2005-04-1817.5 ppb4017 to 19 ppb
2005-03-180 ppb220 ppb
2005-03-170 ppb220 ppb