The Power of Information

National Drinking Water Database


Monterey Park-City, Water Dept. Utilities - Los Angeles, CA


Serves 57,000 people

Arsenic (total)

Arsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
236 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)
4 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
309 days
Tests ConductedNumber of individual tests done for this contaminant
1,199 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Arsenic (total)Arsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides.2.01 ppb
15 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
Yes
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 Arsenic (total)

Health Based Limits for Arsenic (total)

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
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.<0.01 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.02 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.0.02 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.2 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.10 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-240.44 ppb540 to 2.2 ppb
2009-03-170.66 ppb540 to 3.3 ppb
2009-03-100.74 ppb540 to 3.7 ppb
2009-03-044.44 ppb710 to 12 ppb
2009-03-030 ppb660 ppb
2009-02-230.76 ppb540 to 3.8 ppb
2009-02-190.58 ppb540 to 2.9 ppb
2009-02-111.74 ppb530 to 5.9 ppb
2009-02-045.1 ppb720 to 17 ppb
2009-02-030 ppb660 ppb
2009-01-271.68 ppb530 to 5.8 ppb
2009-01-201.9 ppb530 to 6.1 ppb
2009-01-130.6 ppb540 to 3 ppb
2009-01-071.57 ppb760 to 11 ppb
2009-01-063.74 ppb720 to 13 ppb
2008-12-300.54 ppb540 to 2.7 ppb
2008-12-230.56 ppb540 to 2.8 ppb
2008-12-160.54 ppb540 to 2.7 ppb
2008-12-090.42 ppb540 to 2.1 ppb
2008-12-080 ppb110 ppb
2008-12-044.73 ppb610 to 14 ppb
2008-12-020 ppb660 ppb
2008-11-240.62 ppb540 to 3.1 ppb
2008-11-180.8 ppb540 to 4 ppb
2008-11-100.52 ppb540 to 2.6 ppb
2008-11-041.58 ppb13100 to 13 ppb
2008-10-292 ppb102 ppb
2008-10-280.54 ppb540 to 2.7 ppb
2008-10-230.5 ppb540 to 2.5 ppb
2008-10-140.54 ppb760 to 3.8 ppb
2008-10-081.86 ppb760 to 13 ppb
2008-10-075.68 ppb402.2 to 12 ppb
2008-10-010.76 ppb540 to 3.8 ppb
2008-09-230.5 ppb540 to 2.5 ppb
2008-09-160.52 ppb540 to 2.6 ppb
2008-09-090.88 ppb540 to 4.4 ppb
2008-09-0411 ppb1011 ppb
2008-09-032.25 ppb1370 to 14 ppb
2008-08-270.44 ppb870 to 3.5 ppb
2008-08-180.48 ppb540 to 2.4 ppb
2008-08-1515 ppb1015 ppb
2008-08-140 ppb660 ppb
2008-08-137 ppb402.1 to 21 ppb
2008-08-061.87 ppb1040 to 4.2 ppb
2008-08-050 ppb11110 ppb
2008-08-010 ppb110 ppb
2008-07-300 ppb660 ppb
2008-07-291.4 ppb420 to 3.2 ppb
2008-07-230 ppb660 ppb
2008-07-221.8 ppb410 to 2.9 ppb
2008-07-160 ppb330 ppb
2008-07-151.4 ppb210 to 2.8 ppb
2008-07-093.36 ppb14100 to 12 ppb
2008-07-082 ppb520 to 4.4 ppb
2008-07-020 ppb550 ppb
2008-06-240 ppb550 ppb
2008-06-170 ppb330 ppb
2008-06-100.56 ppb540 to 2.8 ppb
2008-06-030.43 ppb760 to 3 ppb
2008-05-271.05 ppb210 to 2.1 ppb
2008-05-210.54 ppb540 to 2.7 ppb
2008-05-206.58 ppb520 to 14 ppb
2008-05-150 ppb110 ppb
2008-05-140.7 ppb430 to 2.8 ppb
2008-05-061.39 ppb1060 to 5.2 ppb
2008-04-280.7 ppb430 to 2.8 ppb
2008-04-220.75 ppb430 to 3 ppb
2008-04-160 ppb660 ppb
2008-04-152.7 ppb102.7 ppb
2008-04-082.7 ppb102.7 ppb
2008-04-022.6 ppb102.6 ppb
2008-03-250.58 ppb430 to 2.3 ppb
2008-03-182.2 ppb102.2 ppb
2008-03-120 ppb330 ppb
2008-03-042.72 ppb1160 to 13 ppb
2008-02-263.1 ppb530 to 13 ppb
2008-02-210.73 ppb430 to 2.9 ppb
2008-02-120.63 ppb430 to 2.5 ppb
2008-02-050.36 ppb760 to 2.5 ppb
2008-01-300.63 ppb430 to 2.5 ppb
2008-01-220.5 ppb430 to 2 ppb
2008-01-160 ppb330 ppb
2008-01-070.29 ppb760 to 2 ppb
2008-01-030.53 ppb430 to 2.1 ppb
2007-12-270 ppb330 ppb
2007-12-190.5 ppb430 to 2 ppb
2007-12-062 ppb102 ppb
2007-11-270 ppb440 ppb
2007-11-215 ppb530 to 13 ppb
2007-11-203.5 ppb203 to 4 ppb
2007-11-140.75 ppb430 to 3 ppb
2007-11-060.52 ppb650 to 3.1 ppb
2007-10-312.3 ppb102.3 ppb
2007-10-223.2 ppb103.2 ppb
2007-10-163.4 ppb103.4 ppb
2007-10-090.95 ppb430 to 3.8 ppb
2007-10-032.96 ppb750 to 14 ppb
2007-10-022.73 ppb410 to 4.7 ppb
2007-09-250 ppb330 ppb
2007-09-205.78 ppb630 to 14 ppb
2007-09-180.73 ppb430 to 2.9 ppb
2007-09-110 ppb330 ppb
2007-09-060 ppb110 ppb
2007-09-050.5 ppb650 to 3 ppb
2007-08-280.6 ppb430 to 2.4 ppb
2007-08-210.68 ppb430 to 2.7 ppb
2007-08-140.58 ppb430 to 2.3 ppb
2007-08-070.58 ppb430 to 2.3 ppb
2007-08-012.93 ppb850 to 14 ppb
2007-07-250.73 ppb430 to 2.9 ppb
2007-07-170.85 ppb430 to 3.4 ppb
2007-07-100.78 ppb430 to 3.1 ppb
2007-07-031.66 ppb1190 to 12 ppb
2007-07-022.4 ppb410 to 3.9 ppb
2007-06-262.6 ppb102.6 ppb
2007-06-256.88 ppb520 to 15 ppb
2007-06-200.65 ppb430 to 2.6 ppb
2007-06-120.95 ppb430 to 3.8 ppb
2007-06-050.48 ppb650 to 2.9 ppb
2007-05-290.6 ppb430 to 2.4 ppb
2007-05-220.73 ppb430 to 2.9 ppb
2007-05-151.6 ppb530 to 5.3 ppb
2007-05-140 ppb110 ppb
2007-05-080.7 ppb430 to 2.8 ppb
2007-05-010.47 ppb650 to 2.8 ppb
2007-04-240.65 ppb430 to 2.6 ppb
2007-04-170.48 ppb540 to 2.4 ppb
2007-04-100.88 ppb430 to 3.5 ppb
2007-04-031.14 ppb750 to 4 ppb
2007-03-2914 ppb1014 ppb
2007-03-271.27 ppb320 to 3.8 ppb
2007-03-260 ppb110 ppb
2007-03-200.9 ppb430 to 3.6 ppb
2007-03-130.88 ppb430 to 3.5 ppb
2007-03-060.58 ppb650 to 3.5 ppb
2007-03-010.85 ppb430 to 3.4 ppb
2007-02-200.83 ppb430 to 3.3 ppb
2007-02-130.93 ppb430 to 3.7 ppb
2007-02-070 ppb220 ppb
2007-02-060.55 ppb650 to 3.3 ppb
2007-01-300.65 ppb430 to 2.6 ppb
2007-01-230.83 ppb430 to 3.3 ppb
2007-01-170 ppb330 ppb
2007-01-160.24 ppb13120 to 3.1 ppb
2007-01-150.33 ppb650 to 2 ppb
2007-01-091.28 ppb960 to 4.4 ppb
2007-01-030.75 ppb430 to 3 ppb
2006-12-260.65 ppb430 to 2.6 ppb
2006-12-190.68 ppb430 to 2.7 ppb
2006-12-120.88 ppb430 to 3.5 ppb
2006-12-050.43 ppb650 to 2.6 ppb
2006-11-302 ppb320 to 6 ppb
2006-11-290.88 ppb430 to 3.5 ppb
2006-11-220 ppb110 ppb
2006-11-210.93 ppb430 to 3.7 ppb
2006-11-140.57 ppb650 to 3.4 ppb
2006-11-100 ppb330 ppb
2006-11-071.8 ppb520 to 4 ppb
2006-10-311.62 ppb530 to 5.3 ppb
2006-10-241.15 ppb640 to 4.1 ppb
2006-10-170.8 ppb430 to 3.2 ppb
2006-10-100.73 ppb430 to 2.9 ppb
2006-10-030.5 ppb650 to 3 ppb
2006-09-260.52 ppb650 to 3.1 ppb
2006-09-190.57 ppb650 to 3.4 ppb
2006-09-123.5 ppb103.5 ppb
2006-09-053.3 ppb103.3 ppb
2006-08-300.6 ppb540 to 3 ppb
2006-08-293.3 ppb103.3 ppb
2006-08-223.5 ppb103.5 ppb
2006-08-153.3 ppb103.3 ppb
2006-08-083.5 ppb103.5 ppb
2006-08-012.9 ppb102.9 ppb
2006-07-250 ppb110 ppb
2006-07-185.1 ppb105.1 ppb
2006-07-112.7 ppb102.7 ppb
2006-07-032.58 ppb410 to 4.1 ppb
2006-06-293.01 ppb730 to 9.4 ppb
2006-06-263.2 ppb103.2 ppb
2006-06-202.6 ppb102.6 ppb
2006-06-164.28 ppb510 to 8.5 ppb
2006-06-132.8 ppb102.8 ppb
2006-06-062.7 ppb102.7 ppb
2006-05-304.45 ppb403 to 5.9 ppb
2006-05-228.03 ppb402.6 to 10 ppb
2006-05-168 ppb403.5 to 9.9 ppb
2006-05-116.27 ppb303.9 to 9.8 ppb
2006-05-092.7 ppb102.7 ppb
2006-05-024.23 ppb610 to 9.6 ppb
2006-04-254 ppb402.5 to 4.8 ppb
2006-04-183.43 ppb720 to 5.8 ppb
2006-04-114.1 ppb303.8 to 4.4 ppb
2006-04-044.76 ppb510 to 10 ppb
2006-03-304.23 ppb830 to 14 ppb
2006-03-294.07 ppb303.5 to 4.4 ppb
2006-03-223.43 ppb303.3 to 3.6 ppb
2006-03-144.48 ppb402.9 to 5.3 ppb
2006-03-074.72 ppb610 to 10 ppb
2006-02-274.23 ppb402.8 to 4.8 ppb
2006-02-213.85 ppb402.6 to 4.4 ppb
2006-02-144.08 ppb402.7 to 4.7 ppb
2006-02-073.83 ppb610 to 9 ppb
2006-02-022.5 ppb102.5 ppb
2006-01-314.58 ppb510 to 9.6 ppb
2006-01-248.13 ppb402.9 to 10 ppb
2006-01-174.23 ppb403.1 to 4.7 ppb
2006-01-102.98 ppb410 to 4.5 ppb
2006-01-043.5 ppb103.5 ppb
2005-12-284.3 ppb104.3 ppb
2005-12-203 ppb103 ppb
2005-12-133.2 ppb103.2 ppb
2005-12-090 ppb110 ppb
2005-12-062.9 ppb102.9 ppb
2005-11-292.8 ppb102.8 ppb
2005-11-222.8 ppb102.8 ppb
2005-11-152.5 ppb102.5 ppb
2005-11-082.78 ppb410 to 4.2 ppb
2005-11-013.75 ppb610 to 8.9 ppb
2005-10-274.17 ppb303.4 to 5.2 ppb
2005-10-252.1 ppb102.1 ppb
2005-10-193.03 ppb410 to 4.3 ppb
2005-10-103.5 ppb402.1 to 4.3 ppb
2005-10-043.06 ppb840 to 11 ppb
2005-09-272.6 ppb410 to 3.6 ppb
2005-09-212.93 ppb410 to 4.3 ppb
2005-09-133.5 ppb402 to 4.2 ppb
2005-09-073.25 ppb620 to 6.6 ppb
2005-08-302.88 ppb410 to 4 ppb
2005-08-232.83 ppb410 to 3.9 ppb
2005-08-162.88 ppb410 to 3.9 ppb
2005-08-1510 ppb208 to 12 ppb
2005-08-093.35 ppb410 to 5 ppb
2005-08-025.55 ppb610 to 11 ppb
2005-07-263.73 ppb402.5 to 4.4 ppb
2005-07-193.57 ppb303.4 to 3.8 ppb
2005-07-124.15 ppb410 to 7.4 ppb
2005-07-056.46 ppb930 to 21 ppb
2005-06-272.6 ppb410 to 3.6 ppb
2005-06-203.55 ppb402.2 to 4.1 ppb
2005-06-154.02 ppb610 to 9.4 ppb
2005-06-070 ppb110 ppb
2005-05-310 ppb110 ppb
2005-05-240 ppb110 ppb
2005-05-173.1 ppb103.1 ppb
2005-05-120 ppb110 ppb
2005-05-112.23 ppb310 to 4.4 ppb
2005-05-030 ppb110 ppb
2005-04-260 ppb110 ppb
2005-04-253.6 ppb840 to 14 ppb
2005-04-190 ppb110 ppb
2005-04-120 ppb110 ppb
2005-04-050 ppb330 ppb
2005-03-290 ppb110 ppb
2005-03-220 ppb110 ppb
2005-03-150 ppb110 ppb
2005-03-070 ppb110 ppb
2005-03-010 ppb110 ppb
2005-02-220 ppb110 ppb
2005-02-1711 ppb1011 ppb
2005-02-150 ppb110 ppb
2005-02-080 ppb110 ppb
2005-02-010 ppb330 ppb
2005-01-250 ppb110 ppb
2005-01-180 ppb110 ppb
2005-01-120 ppb110 ppb
2005-01-040 ppb110 ppb
2004-12-280 ppb110 ppb
2004-12-222.18 ppb630 to 5 ppb
2004-12-216.8 ppb410 to 19 ppb
2004-12-203.66 ppb520 to 8.7 ppb
2004-12-130 ppb110 ppb
2004-12-070 ppb110 ppb
2004-12-060 ppb110 ppb
2004-11-220 ppb110 ppb
2004-11-150 ppb110 ppb
2004-11-100 ppb220 ppb
2004-11-080 ppb110 ppb
2004-11-020 ppb330 ppb
2004-10-250 ppb110 ppb
2004-10-180 ppb110 ppb
2004-10-110 ppb110 ppb
2004-10-040 ppb110 ppb
2004-09-270 ppb110 ppb
2004-09-200 ppb110 ppb
2004-09-150 ppb110 ppb
2004-09-080 ppb110 ppb
2004-08-300 ppb110 ppb
2004-08-230 ppb110 ppb
2004-08-020 ppb220 ppb
2004-07-261.87 ppb320 to 5.6 ppb
2004-07-252.68 ppb630 to 5.4 ppb
2004-07-242.78 ppb420 to 5.9 ppb
2004-05-121 ppb320 to 3 ppb
2004-04-264 ppb403.2 to 5.9 ppb
2004-04-194.95 ppb403.8 to 8 ppb
2004-04-124.18 ppb610 to 7.8 ppb
2004-04-054.75 ppb403.5 to 8 ppb
2004-03-293.88 ppb403.3 to 5.3 ppb
2004-03-225.23 ppb404.1 to 7.7 ppb
2004-03-170 ppb110 ppb
2004-03-153.88 ppb403.7 to 4 ppb
2004-03-084.3 ppb403.9 to 4.6 ppb
2004-03-014.92 ppb610 to 11 ppb
2004-02-244.8 ppb404.1 to 5.9 ppb
2004-02-175.4 ppb404.1 to 7.8 ppb
2004-02-094.6 ppb610 to 8.7 ppb
2004-02-064.5 ppb304.2 to 4.7 ppb
2004-02-054.64 ppb904.1 to 5 ppb
2004-02-045.47 ppb1004.8 to 6.1 ppb