The Power of Information

National Drinking Water Database

San Jose Water Company Utilities - San Jose, CA

Serves 979,000 people


Aluminum is a metal released from metal refineries and mining operations.
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
101 days
Tests ConductedNumber of individual tests done for this contaminant
178 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
AluminumAluminum is a metal released from metal refineries and mining operations.17.72 ppb
180 ppb
200 ppb
200 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 Aluminum

Health Based Limits for Aluminum

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. 200 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.600 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-240 ppb110 ppb
2009-03-180 ppb110 ppb
2009-03-110 ppb110 ppb
2009-02-240 ppb110 ppb
2009-02-09150 ppb10150 ppb
2009-01-200 ppb110 ppb
2008-12-110 ppb110 ppb
2008-11-200 ppb110 ppb
2008-11-060 ppb110 ppb
2008-11-050 ppb220 ppb
2008-11-030 ppb110 ppb
2008-10-140 ppb110 ppb
2008-10-080 ppb110 ppb
2008-10-071.21 ppb101.21 ppb
2008-09-290 ppb110 ppb
2008-09-2326.35 ppb1026.35 ppb
2008-09-091.53 ppb300.35 to 2.81 ppb
2008-08-120 ppb110 ppb
2008-08-070 ppb220 ppb
2008-08-060 ppb220 ppb
2008-07-2428.81 ppb1028.81 ppb
2008-07-084.24 ppb201.08 to 7.4 ppb
2008-06-19158.48 ppb10158.48 ppb
2008-06-033.82 ppb201.53 to 6.1 ppb
2008-05-050 ppb110 ppb
2008-04-2467.78 ppb1067.78 ppb
2008-04-170 ppb110 ppb
2008-04-150 ppb110 ppb
2008-04-0814.48 ppb200.34 to 28.63 ppb
2008-03-270 ppb110 ppb
2008-03-130 ppb220 ppb
2008-03-055.59 ppb105.59 ppb
2008-03-041.23 ppb101.23 ppb
2008-02-110 ppb110 ppb
2008-02-0546.36 ppb1046.36 ppb
2008-01-280 ppb110 ppb
2008-01-232.01 ppb210 to 4.03 ppb
2008-01-140 ppb110 ppb
2008-01-1085 ppb210 to 170 ppb
2007-12-044.99 ppb400.97 to 11.95 ppb
2007-11-0680.96 ppb300.55 to 229.7 ppb
2007-10-16129.19 ppb303.42 to 375.7 ppb
2007-09-120 ppb110 ppb
2007-09-111.85 ppb200.96 to 2.74 ppb
2007-08-210 ppb110 ppb
2007-08-160 ppb110 ppb
2007-08-140 ppb110 ppb
2007-07-100.3 ppb200.23 to 0.36 ppb
2007-06-0510.14 ppb700.61 to 64.59 ppb
2007-05-082.7 ppb200.15 to 5.25 ppb
2007-04-190 ppb110 ppb
2007-04-031.61 ppb200.18 to 3.04 ppb
2007-03-280 ppb110 ppb
2007-03-060 ppb220 ppb
2007-03-050 ppb110 ppb
2007-01-300 ppb110 ppb
2007-01-0962.19 ppb1062.19 ppb
2006-12-065.19 ppb105.19 ppb
2006-11-140.98 ppb200.63 to 1.34 ppb
2006-10-207.14 ppb107.14 ppb
2006-10-170.59 ppb100.59 ppb
2006-09-12161.13 ppb302.02 to 441.24 ppb
2006-08-150 ppb110 ppb
2006-08-140 ppb110 ppb
2006-08-100 ppb220 ppb
2006-07-123.4 ppb103.4 ppb
2006-07-110.6 ppb100.6 ppb
2006-06-202.16 ppb200.52 to 3.8 ppb
2006-05-090 ppb220 ppb
2006-04-260 ppb110 ppb
2006-03-150 ppb110 ppb
2006-02-140 ppb110 ppb
2006-01-09180 ppb10180 ppb
2005-12-210 ppb110 ppb
2005-12-0611.51 ppb300.93 to 17.13 ppb
2005-11-010.83 ppb200.79 to 0.87 ppb
2005-10-0410.64 ppb301.42 to 25.56 ppb
2005-09-200 ppb220 ppb
2005-09-150 ppb220 ppb
2005-08-100 ppb440 ppb
2005-07-210 ppb110 ppb
2005-06-1422.56 ppb2012.44 to 32.67 ppb
2005-04-1918.75 ppb203.75 to 33.75 ppb
2005-03-1511.06 ppb204.36 to 17.75 ppb
2005-02-083.11 ppb103.11 ppb
2005-01-280 ppb110 ppb
2005-01-2731.33 ppb320 to 94 ppb
2004-12-0722.33 ppb304.47 to 48.9 ppb
2004-11-1611.18 ppb802.53 to 48.51 ppb
2004-10-1926.87 ppb209.02 to 44.72 ppb
2004-09-219.75 ppb501.25 to 29.14 ppb
2004-08-170 ppb440 ppb
2004-07-213.61 ppb103.61 ppb
2004-07-201.49 ppb201.45 to 1.53 ppb
2004-06-226.99 ppb501.3 to 23.68 ppb
2004-05-2598 ppb1098 ppb
2004-05-20150 ppb10150 ppb
2004-04-200 ppb330 ppb
2004-03-170 ppb220 ppb
2004-03-160 ppb220 ppb
2004-01-2797.5 ppb210 to 195 ppb