The Power of Information

National Drinking Water Database


California Water Service - Stockton Utilities - San Jose, CA


Serves 155,670 people

Manganese

Manganese is a naturally occurring element released from mineral deposits as well as industrial use.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
56 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)
56 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
118 days
Tests ConductedNumber of individual tests done for this contaminant
386 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ManganeseManganese is a naturally occurring element released from mineral deposits as well as industrial use.51.34 ppb
163.25 ppb
Yes
50 ppb
Yes
50 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 Manganese

Health Based Limits for Manganese

StandardDescriptionLevel
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.50 ppb
National Secondary Drinking Water RegulationsA National Secondary Drinking Water Regulation is a non-enforceable guideline regarding contaminants that may cause cosmetic effects (such as taste, odor, or color). Some states choose to adopt them as enforceable standards. Source: U.S. Environmental Protection Agency. 50 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.300 ppb
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.300 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 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.1600 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-2520 ppb1020 ppb
2009-03-1821.4 ppb520 to 46 ppb
2009-03-1221.8 ppb520 to 47 ppb
2009-03-0423.2 ppb520 to 61 ppb
2009-03-0287.5 ppb410 to 180 ppb
2009-02-2545.8 ppb5023 to 72 ppb
2009-02-1824.6 ppb520 to 69 ppb
2009-02-1117.2 ppb540 to 86 ppb
2009-02-040 ppb440 ppb
2009-02-0318.67 ppb310 to 34 ppb
2009-01-228.4 ppb540 to 42 ppb
2009-01-1417 ppb420 to 43 ppb
2008-12-3011.5 ppb430 to 46 ppb
2008-12-1034.6 ppb510 to 74 ppb
2008-12-08155 ppb20120 to 190 ppb
2008-11-1917.67 ppb320 to 53 ppb
2008-11-1871 ppb1071 ppb
2008-11-1738 ppb2036 to 40 ppb
2008-09-177 ppb107 ppb
2008-09-1579.66 ppb8013.4 to 183.7 ppb
2008-08-0458.23 ppb810 to 291.2 ppb
2008-07-280 ppb110 ppb
2008-07-0896.65 ppb2046.2 to 147.1 ppb
2008-07-0718 ppb306.5 to 28.4 ppb
2008-06-300 ppb110 ppb
2008-06-0524.7 ppb410 to 44.8 ppb
2008-06-0371.95 ppb3019.82 to 148.8 ppb
2008-06-0268.4 ppb3021.5 to 107.4 ppb
2008-05-190 ppb110 ppb
2008-05-1463.88 ppb5014.9 to 176.5 ppb
2008-05-063.91 ppb201.07 to 6.75 ppb
2008-04-08138.93 ppb3053.9 to 192.1 ppb
2008-04-076.4 ppb201 to 11.8 ppb
2008-03-0596.8 ppb301.6 to 184.8 ppb
2008-03-0468.98 ppb502.9 to 191.4 ppb
2008-02-1254.2 ppb2042.1 to 66.3 ppb
2008-02-0539.4 ppb510 to 136.7 ppb
2008-01-1448.9 ppb4012.7 to 124.6 ppb
2007-12-1783.75 ppb4021.9 to 171.4 ppb
2007-12-12103.1 ppb4022.2 to 181.3 ppb
2007-11-0630.59 ppb200.03 to 61.15 ppb
2007-11-0552.98 ppb5017.2 to 126.7 ppb
2007-10-166.12 ppb106.12 ppb
2007-10-0949.64 ppb5014.2 to 120.6 ppb
2007-09-1935 ppb1035 ppb
2007-09-1252.83 ppb409 to 132.7 ppb
2007-09-1164.96 ppb3014.79 to 99.4 ppb
2007-09-1060.93 ppb409.2 to 168.1 ppb
2007-08-3028 ppb1028 ppb
2007-08-0842 ppb2040.6 to 43.4 ppb
2007-08-0644.3 ppb410 to 118.9 ppb
2007-07-1165.48 ppb405 to 187.9 ppb
2007-06-27109.7 ppb3080.4 to 156.6 ppb
2007-06-04141.33 ppb4027.2 to 289.5 ppb
2007-05-14109.42 ppb6015.8 to 300.1 ppb
2007-04-09158.33 ppb4029 to 308.5 ppb
2007-03-05136.7 ppb809.2 to 287.6 ppb
2007-02-0859.2 ppb2047.2 to 71.2 ppb
2007-02-05153.03 ppb4012 to 275.5 ppb
2007-01-08128.9 ppb408.3 to 229.2 ppb
2006-12-0683.43 ppb404.2 to 142.1 ppb
2006-11-1429.77 ppb1029.77 ppb
2006-11-0849.58 ppb610 to 125.1 ppb
2006-11-0160 ppb5016.1 to 124.6 ppb
2006-10-2560.4 ppb5012.6 to 122.7 ppb
2006-10-1858.78 ppb5012 to 117.4 ppb
2006-10-17109 ppb10109 ppb
2006-10-1155.54 ppb503.4 to 120.8 ppb
2006-10-0458.06 ppb5010.4 to 121.2 ppb
2006-09-2756.8 ppb5013.3 to 113.8 ppb
2006-09-2044.56 ppb5014.2 to 76 ppb
2006-09-1359.18 ppb5021.2 to 101 ppb
2006-09-0653.04 ppb5014.4 to 91.1 ppb
2006-08-3051.74 ppb5016.9 to 86 ppb
2006-08-2355.06 ppb510 to 102.3 ppb
2006-08-1657.68 ppb5014.4 to 115 ppb
2006-08-0961.2 ppb5013.1 to 127 ppb
2006-08-0259.14 ppb5013.8 to 127 ppb
2006-07-2679.84 ppb5015.2 to 227 ppb
2006-07-25133.25 ppb2014.6 to 251.9 ppb
2006-07-24163.25 ppb2019.9 to 306.6 ppb
2006-07-21148.75 ppb208.7 to 288.8 ppb
2006-07-20109.6 ppb510 to 351.7 ppb
2006-07-0643.8 ppb407.8 to 93.6 ppb
2006-06-2837.18 ppb410 to 93.7 ppb
2006-06-2140.35 ppb406.9 to 103.9 ppb
2006-06-2062.55 ppb205.5 to 119.6 ppb
2006-06-1967.25 ppb2021.2 to 113.3 ppb
2006-06-16108.2 ppb2015.8 to 200.6 ppb
2006-06-159.37 ppb640 to 33.1 ppb
2006-06-130 ppb220 ppb
2006-06-120 ppb220 ppb
2006-06-0915.35 ppb210 to 30.7 ppb
2006-06-0710.9 ppb210 to 21.8 ppb
2006-06-0613.65 ppb205 to 22.3 ppb
2006-06-055 ppb210 to 10 ppb
2006-06-0211.15 ppb210 to 22.3 ppb
2006-05-315.95 ppb210 to 11.9 ppb
2006-05-302.8 ppb210 to 5.6 ppb
2006-05-265.4 ppb210 to 10.8 ppb
2006-05-257.75 ppb210 to 15.5 ppb
2006-05-2414.65 ppb210 to 29.3 ppb
2006-05-2314.45 ppb210 to 28.9 ppb
2006-05-2241.15 ppb210 to 82.3 ppb
2006-05-1053.13 ppb3031.3 to 87.2 ppb
2006-05-030 ppb110 ppb
2006-05-020 ppb110 ppb
2006-02-020 ppb110 ppb
2005-11-0139.34 ppb200.2 to 78.47 ppb
2005-07-1225.73 ppb304.43 to 64.79 ppb
2005-06-1414.43 ppb2010.34 to 18.52 ppb
2005-05-10142.01 ppb10142.01 ppb
2005-03-150.2 ppb100.2 ppb
2004-12-0740.58 ppb300.15 to 68.91 ppb
2004-10-198.11 ppb108.11 ppb
2004-09-3080 ppb1080 ppb
2004-09-2154.72 ppb2012.16 to 97.29 ppb
2004-05-2590 ppb1090 ppb