The Power of Information

National Drinking Water Database

City of Fresno Water Division Utilities - Fresno, CA

Serves 390,350 people


Dimethoate is an organophosphate insecticide used on crops and in livestock.
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
71 days
Tests ConductedNumber of individual tests done for this contaminant
456 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
DimethoateDimethoate is an organophosphate insecticide used on crops and in livestock.0 ppb
0 ppb
2 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 Dimethoate

Health Based Limits for Dimethoate

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.2 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-020 ppb110 ppb
2008-11-210 ppb110 ppb
2008-11-180 ppb110 ppb
2008-11-070 ppb110 ppb
2008-11-040 ppb330 ppb
2008-07-170 ppb110 ppb
2008-03-190 ppb330 ppb
2008-03-180 ppb990 ppb
2008-03-170 ppb10100 ppb
2008-03-140 ppb440 ppb
2008-03-130 ppb550 ppb
2008-03-120 ppb10100 ppb
2008-03-110 ppb990 ppb
2008-03-100 ppb110 ppb
2008-03-040 ppb110 ppb
2008-02-290 ppb220 ppb
2008-02-280 ppb10100 ppb
2008-02-270 ppb990 ppb
2008-02-260 ppb990 ppb
2008-02-250 ppb10100 ppb
2008-02-220 ppb880 ppb
2008-02-210 ppb10100 ppb
2008-02-200 ppb880 ppb
2008-02-190 ppb10100 ppb
2008-02-150 ppb440 ppb
2008-02-140 ppb10100 ppb
2008-02-130 ppb880 ppb
2008-02-120 ppb10100 ppb
2008-02-110 ppb10100 ppb
2008-02-080 ppb10100 ppb
2008-02-070 ppb10100 ppb
2008-02-060 ppb10100 ppb
2007-10-310 ppb110 ppb
2007-08-300 ppb110 ppb
2007-08-280 ppb110 ppb
2006-07-250 ppb110 ppb
2006-07-120 ppb330 ppb
2006-06-270 ppb220 ppb
2006-05-260 ppb110 ppb
2006-05-020 ppb110 ppb
2006-01-040 ppb110 ppb
2006-01-030 ppb330 ppb
2005-12-300 ppb880 ppb
2005-09-130 ppb110 ppb
2005-07-270 ppb110 ppb
2005-03-160 ppb110 ppb
2004-12-140 ppb220 ppb
2004-11-170 ppb220 ppb
2004-11-160 ppb13130 ppb
2004-11-150 ppb14140 ppb
2004-11-120 ppb660 ppb
2004-11-100 ppb16160 ppb
2004-11-090 ppb15150 ppb
2004-11-040 ppb220 ppb
2004-11-030 ppb14140 ppb
2004-11-020 ppb14140 ppb
2004-10-290 ppb110 ppb
2004-10-280 ppb550 ppb
2004-10-270 ppb15150 ppb
2004-10-260 ppb880 ppb
2004-10-220 ppb14140 ppb
2004-10-210 ppb14140 ppb
2004-10-190 ppb660 ppb
2004-10-150 ppb550 ppb
2004-10-140 ppb11110 ppb
2004-10-130 ppb21210 ppb
2004-10-120 ppb19190 ppb
2004-10-080 ppb110 ppb
2004-07-200 ppb220 ppb
2004-05-070 ppb110 ppb
2004-04-200 ppb110 ppb