The Power of Information

National Drinking Water Database


City of Tacoma Water Division Utilities - Tacoma, WA


Serves 305,000 people

Parathion (ethyl)

Ethyl parathion is a highly toxic, restricted use organophosphate insecticide and miticide applied to alfalfa, barley, corn, cotton, canola, sorghum, soybean, sunflower, and wheat.
 
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
23 days
Tests ConductedNumber of individual tests done for this contaminant
28 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Parathion (ethyl)Ethyl parathion is a highly toxic, restricted use organophosphate insecticide and miticide applied to alfalfa, barley, corn, cotton, canola, sorghum, soybean, sunflower, and wheat.0 ppb
0 ppb
No
0.02 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 Parathion (ethyl)

Health Based Limits for Parathion (ethyl)

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.0.02 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2006-10-260 ppb110 ppb
2006-10-050 ppb110 ppb
2006-09-210 ppb110 ppb
2006-09-130 ppb110 ppb
2006-07-260 ppb110 ppb
2006-07-110 ppb110 ppb
2006-05-010 ppb110 ppb
2005-10-310 ppb220 ppb
2005-10-260 ppb110 ppb
2005-10-190 ppb110 ppb
2005-08-110 ppb110 ppb
2005-07-280 ppb110 ppb
2005-06-280 ppb220 ppb
2005-06-210 ppb220 ppb
2005-06-200 ppb220 ppb
2005-06-150 ppb110 ppb
2005-06-130 ppb110 ppb
2005-06-090 ppb110 ppb
2005-06-070 ppb220 ppb
2005-05-250 ppb110 ppb
2004-12-220 ppb110 ppb
2004-11-300 ppb110 ppb
2004-10-190 ppb110 ppb