The Power of Information

National Drinking Water Database

California Water Service - Stockton Utilities - San Jose, CA

Serves 155,670 people


Industrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.
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
120 days
Tests ConductedNumber of individual tests done for this contaminant
260 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
1,1-DichloroethyleneIndustrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.0 ppb
0 ppb
7 ppb
7 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 1,1-Dichloroethylene

Health Based Limits for 1,1-Dichloroethylene

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.7 ppb
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.7 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.10 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.330 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
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.2000 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.2000 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-250 ppb110 ppb
2009-03-230 ppb110 ppb
2009-03-180 ppb220 ppb
2009-03-160 ppb110 ppb
2009-03-110 ppb110 ppb
2009-03-090 ppb110 ppb
2009-03-050 ppb110 ppb
2009-03-040 ppb220 ppb
2009-03-020 ppb110 ppb
2009-02-250 ppb110 ppb
2009-02-230 ppb110 ppb
2009-02-190 ppb110 ppb
2009-02-180 ppb550 ppb
2009-02-170 ppb110 ppb
2009-02-160 ppb110 ppb
2009-02-150 ppb110 ppb
2009-02-140 ppb110 ppb
2009-02-110 ppb110 ppb
2009-02-090 ppb110 ppb
2009-02-050 ppb220 ppb
2009-02-040 ppb110 ppb
2009-02-020 ppb110 ppb
2009-01-280 ppb110 ppb
2009-01-270 ppb330 ppb
2009-01-260 ppb110 ppb
2009-01-220 ppb110 ppb
2009-01-210 ppb330 ppb
2009-01-200 ppb220 ppb
2009-01-140 ppb110 ppb
2009-01-120 ppb110 ppb
2009-01-070 ppb110 ppb
2009-01-050 ppb110 ppb
2009-01-010 ppb220 ppb
2008-12-310 ppb110 ppb
2008-12-220 ppb110 ppb
2008-12-180 ppb220 ppb
2008-12-170 ppb110 ppb
2008-12-150 ppb110 ppb
2008-12-100 ppb110 ppb
2008-12-080 ppb110 ppb
2008-12-040 ppb110 ppb
2008-12-030 ppb110 ppb
2008-12-020 ppb110 ppb
2008-12-010 ppb220 ppb
2008-11-280 ppb110 ppb
2008-11-270 ppb110 ppb
2008-11-260 ppb110 ppb
2008-11-240 ppb110 ppb
2008-11-210 ppb110 ppb
2008-11-200 ppb110 ppb
2008-11-190 ppb220 ppb
2008-11-180 ppb440 ppb
2008-11-170 ppb110 ppb
2008-11-140 ppb220 ppb
2008-11-030 ppb110 ppb
2008-11-020 ppb110 ppb
2008-11-010 ppb110 ppb
2008-10-220 ppb660 ppb
2008-08-260 ppb110 ppb
2008-08-190 ppb330 ppb
2008-07-230 ppb660 ppb
2008-05-290 ppb220 ppb
2008-04-090 ppb330 ppb
2008-04-080 ppb330 ppb
2008-02-130 ppb330 ppb
2008-01-140 ppb770 ppb
2007-11-140 ppb440 ppb
2007-10-170 ppb330 ppb
2007-08-300 ppb330 ppb
2007-08-270 ppb110 ppb
2007-07-240 ppb220 ppb
2007-05-160 ppb330 ppb
2007-04-110 ppb550 ppb
2007-02-210 ppb330 ppb
2007-01-170 ppb330 ppb
2006-12-200 ppb110 ppb
2006-11-200 ppb330 ppb
2006-10-300 ppb660 ppb
2006-10-260 ppb110 ppb
2006-10-250 ppb220 ppb
2006-10-180 ppb440 ppb
2006-10-170 ppb110 ppb
2006-08-280 ppb110 ppb
2006-08-230 ppb220 ppb
2006-08-220 ppb330 ppb
2006-07-200 ppb880 ppb
2006-05-180 ppb110 ppb
2006-04-190 ppb660 ppb
2006-04-170 ppb220 ppb
2006-04-050 ppb330 ppb
2006-03-130 ppb220 ppb
2006-02-130 ppb440 ppb
2006-01-300 ppb440 ppb
2006-01-190 ppb440 ppb
2005-11-170 ppb330 ppb
2005-11-160 ppb110 ppb
2005-11-070 ppb330 ppb
2005-09-140 ppb110 ppb
2005-07-250 ppb110 ppb
2005-07-180 ppb550 ppb
2005-05-110 ppb110 ppb
2005-04-190 ppb440 ppb
2005-04-140 ppb110 ppb
2005-02-170 ppb110 ppb
2005-01-250 ppb330 ppb
2005-01-200 ppb220 ppb
2004-12-210 ppb110 ppb
2004-11-170 ppb440 ppb
2004-10-200 ppb220 ppb
2004-09-210 ppb110 ppb
2004-08-250 ppb330 ppb
2004-08-170 ppb330 ppb
2004-07-210 ppb440 ppb
2004-06-230 ppb110 ppb
2004-06-220 ppb220 ppb
2004-06-100 ppb110 ppb
2004-05-250 ppb440 ppb
2004-04-210 ppb660 ppb
2004-02-180 ppb440 ppb
2004-01-200 ppb220 ppb