The Power of Information

National Drinking Water Database

Alameda County Water District Utilities - Oakland, CA

Serves 271,000 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
19 days
Tests ConductedNumber of individual tests done for this contaminant
129 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
2008-12-090 ppb110 ppb
2008-07-230 ppb19190 ppb
2008-07-160 ppb660 ppb
2007-12-190 ppb110 ppb
2007-08-150 ppb110 ppb
2007-07-110 ppb10100 ppb
2007-07-100 ppb11110 ppb
2007-06-210 ppb110 ppb
2006-11-280 ppb110 ppb
2006-06-210 ppb660 ppb
2006-06-200 ppb19190 ppb
2005-05-250 ppb21210 ppb
2004-11-160 ppb110 ppb
2004-07-070 ppb110 ppb
2004-06-230 ppb20200 ppb
2004-05-260 ppb110 ppb
2004-04-280 ppb220 ppb
2004-04-140 ppb220 ppb
2004-01-140 ppb550 ppb