The Power of Information

National Drinking Water Database


San Gabriel Valley WC - Fontana Utilities - Los Angeles, CA


Serves 102,599 people

Prometryn

Prometryn is an herbicide applied to various food and feed crops, primarily cotton and celery; it has been detected in groundwater in agricultural areas in California.
 
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
40 days
Tests ConductedNumber of individual tests done for this contaminant
77 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
PrometrynPrometryn is an herbicide applied to various food and feed crops, primarily cotton and celery; it has been detected in groundwater in agricultural areas in California.0 ppb
0 ppb
No
300 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 Prometryn

Health Based Limits for Prometryn

StandardDescriptionLevel
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.300 ppb

Testing Results

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