The Power of Information

National Drinking Water Database

Great Oaks Wc, Inc. Utilities - San Jose, CA

Serves 69,787 people

Thiobencarb (Bolero)

Thiobencarb is an herbicide used in rice production.
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
16 days
Tests ConductedNumber of individual tests done for this contaminant
40 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Thiobencarb (Bolero)Thiobencarb is an herbicide used in rice production.0 ppb
0 ppb
70 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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 Thiobencarb (Bolero)

Health Based Limits for Thiobencarb (Bolero)

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.70 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.70 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2008-10-160 ppb110 ppb
2008-09-110 ppb110 ppb
2008-08-270 ppb220 ppb
2008-06-040 ppb110 ppb
2007-09-170 ppb110 ppb
2007-06-210 ppb13130 ppb
2007-02-050 ppb110 ppb
2006-03-150 ppb220 ppb
2005-12-290 ppb110 ppb
2005-10-310 ppb110 ppb
2005-09-300 ppb110 ppb
2005-04-250 ppb110 ppb
2004-08-050 ppb110 ppb
2004-07-150 ppb110 ppb
2004-06-080 ppb440 ppb
2004-06-070 ppb880 ppb