The Power of Information

National Drinking Water Database


City of Manteca Utilities - Stockton, CA


Serves 44,500 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
116 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)
83 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
116 days
Tests ConductedNumber of individual tests done for this contaminant
279 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.12.98 ppb
23 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
2009-03-309.67 ppb304.6 to 19 ppb
2009-03-247.57 ppb304.8 to 13 ppb
2009-03-2311 ppb1011 ppb
2009-03-203.9 ppb103.9 ppb
2009-03-185.4 ppb105.4 ppb
2009-03-164.3 ppb104.3 ppb
2009-03-126.8 ppb106.8 ppb
2009-03-1112.5 ppb206 to 19 ppb
2009-03-1016.5 ppb2014 to 19 ppb
2009-03-0913.1 ppb305.3 to 19 ppb
2009-03-0817.5 ppb2015 to 20 ppb
2009-03-0717.5 ppb2015 to 20 ppb
2009-03-0614.47 ppb309.4 to 20 ppb
2009-03-0517 ppb2015 to 19 ppb
2009-03-049.8 ppb205.6 to 14 ppb
2009-03-0313.07 ppb305.2 to 20 ppb
2009-03-026.3 ppb106.3 ppb
2009-02-276.2 ppb106.2 ppb
2009-02-256.2 ppb106.2 ppb
2009-02-2416 ppb2014 to 18 ppb
2009-02-2313.4 ppb206.8 to 20 ppb
2009-02-209.7 ppb109.7 ppb
2009-02-197 ppb107 ppb
2009-02-187.1 ppb107.1 ppb
2009-02-1712.54 ppb507.2 to 21 ppb
2009-02-167.4 ppb107.4 ppb
2009-02-157.2 ppb107.2 ppb
2009-02-147.2 ppb107.2 ppb
2009-02-137 ppb107 ppb
2009-02-127.1 ppb107.1 ppb
2009-02-117.1 ppb107.1 ppb
2009-02-1012.5 ppb407 to 16 ppb
2009-02-097.2 ppb107.2 ppb
2009-02-087.7 ppb107.7 ppb
2009-02-078.8 ppb108.8 ppb
2009-02-0611 ppb1011 ppb
2009-02-0512 ppb1012 ppb
2009-02-0412 ppb1012 ppb
2009-02-0313.6 ppb5011 to 19 ppb
2009-02-0211 ppb1011 ppb
2009-02-0111 ppb1011 ppb
2009-01-3011 ppb1011 ppb
2009-01-2912 ppb1012 ppb
2009-01-2813 ppb1013 ppb
2009-01-2714 ppb1014 ppb
2009-01-2620 ppb3016 to 23 ppb
2009-01-0618 ppb2018 ppb
2008-12-3021 ppb1021 ppb
2008-12-2322 ppb1022 ppb
2008-12-1619.8 ppb5015 to 22 ppb
2008-12-0922 ppb1022 ppb
2008-12-0221 ppb1021 ppb
2008-12-0119 ppb1019 ppb
2008-11-2522 ppb1022 ppb
2008-11-1923 ppb1023 ppb
2008-11-1715.17 ppb12011 to 21 ppb
2008-11-1221 ppb1021 ppb
2008-11-0419 ppb1019 ppb
2008-10-2412.25 ppb205.5 to 19 ppb
2008-10-2213.15 ppb206.3 to 20 ppb
2008-10-2014.35 ppb208.7 to 20 ppb
2008-10-1416 ppb2011 to 21 ppb
2008-10-1014.5 ppb208 to 21 ppb
2008-10-0816 ppb2011 to 21 ppb
2008-09-2916 ppb2014 to 18 ppb
2008-09-2319 ppb1019 ppb
2008-09-1619 ppb1019 ppb
2008-09-0920 ppb1020 ppb
2008-09-075.8 ppb105.8 ppb
2008-09-0513.33 ppb608 to 17 ppb
2008-09-036.5 ppb505.6 to 8 ppb
2008-09-029.6 ppb310 to 19 ppb
2008-08-2915.72 ppb509.6 to 22 ppb
2008-08-258.7 ppb806.6 to 15 ppb
2008-08-217.12 ppb506.2 to 9 ppb
2008-08-196 ppb106 ppb
2008-08-135.3 ppb105.3 ppb
2008-08-0617.2 ppb5011 to 21 ppb
2008-08-0517 ppb8014 to 21 ppb
2008-06-1019 ppb1019 ppb
2008-06-0913 ppb2013 ppb
2008-06-0613 ppb2013 ppb
2008-06-0515.67 ppb3012 to 22 ppb
2008-05-0814.67 ppb9011 to 19 ppb
2008-04-0913 ppb1013 ppb
2008-04-0712 ppb1012 ppb
2008-03-1015 ppb1015 ppb
2008-02-1112.89 ppb709.2 to 20 ppb
2007-10-0918.5 ppb2018 to 19 ppb
2007-09-2713.45 ppb808.6 to 18 ppb
2007-05-0814.8 ppb5012 to 18 ppb
2007-04-1114.55 ppb609.3 to 18 ppb
2007-02-068.7 ppb407.8 to 9.9 ppb
2007-01-1711.38 ppb408.6 to 15 ppb
2007-01-0314.8 ppb5010 to 18 ppb
2006-12-0510.5 ppb2010 to 11 ppb
2006-11-0111.5 ppb2011 to 12 ppb
2006-10-1112.9 ppb808.7 to 20 ppb
2006-09-079.57 ppb306.7 to 12 ppb
2006-08-3118 ppb1018 ppb
2006-08-2118 ppb1018 ppb
2006-08-1518 ppb1018 ppb
2006-08-0718 ppb1018 ppb
2006-08-0112.5 ppb2012 to 13 ppb
2006-07-1113.23 ppb809.8 to 18 ppb
2006-06-0713 ppb1013 ppb
2006-05-2410 ppb1010 ppb
2006-05-1011.08 ppb609.2 to 16 ppb
2006-02-069.7 ppb109.7 ppb
2005-06-1517 ppb1017 ppb
2005-03-0312 ppb2011 to 13 ppb
2004-08-0318.5 ppb2018 to 19 ppb
2004-07-0712 ppb1012 ppb
2004-05-0314.5 ppb2012 to 17 ppb
2004-03-0111 ppb1011 ppb
2004-01-1411 ppb1011 ppb