The Power of Information

National Drinking Water Database

San Jose Water Company Utilities - San Jose, CA

Serves 979,000 people


Carbofuran is a highly toxic insecticide and soil fumigant that had been used on corn, rice and alfalfa; it poses severe risks to children (via diet), agricultural workers and the environment.
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
37 days
Tests ConductedNumber of individual tests done for this contaminant
107 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
CarbofuranCarbofuran is a highly toxic insecticide and soil fumigant that had been used on corn, rice and alfalfa; it poses severe risks to children (via diet), agricultural workers and the environment.0 ppb
0 ppb
1.7 ppb
40 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 Carbofuran

Health Based Limits for Carbofuran

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.1.7 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.40 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.40 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-02-250 ppb110 ppb
2008-12-150 ppb220 ppb
2008-12-040 ppb110 ppb
2008-12-030 ppb220 ppb
2008-09-220 ppb330 ppb
2008-07-020 ppb220 ppb
2008-06-250 ppb220 ppb
2008-06-240 ppb220 ppb
2008-06-230 ppb440 ppb
2008-06-180 ppb110 ppb
2008-06-170 ppb660 ppb
2008-06-120 ppb550 ppb
2008-06-100 ppb330 ppb
2008-06-020 ppb110 ppb
2008-05-290 ppb880 ppb
2008-05-270 ppb220 ppb
2008-05-200 ppb440 ppb
2008-05-190 ppb440 ppb
2008-05-140 ppb110 ppb
2008-05-130 ppb880 ppb
2008-05-070 ppb220 ppb
2008-05-060 ppb220 ppb
2008-05-050 ppb110 ppb
2008-04-300 ppb550 ppb
2008-04-280 ppb660 ppb
2008-04-230 ppb660 ppb
2008-04-220 ppb880 ppb
2008-03-270 ppb110 ppb
2007-04-190 ppb110 ppb
2007-03-280 ppb110 ppb
2007-03-050 ppb110 ppb
2007-01-300 ppb110 ppb
2006-01-190 ppb110 ppb
2005-10-030 ppb440 ppb
2005-07-260 ppb110 ppb
2005-07-210 ppb330 ppb
2005-07-200 ppb110 ppb