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EWG's Tap Water Database — 2019 UPDATE

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2,4,5-TP (Silvex)

Water District 1 of Johnson County

2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND40ND
2014ND30ND
2015ND30ND
2016ND30ND
2017ND30ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 3 ppb

The EWG Health Guideline of 3 ppb for 2,4,5-TP was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 50 ppb

ppb = parts per billion

All test results

Date Lab ID Result
2012-05-22MAY2012-SOC-TP2ND
2012-05-22MAY2012-VOC-TP3ND
2012-05-22MAY2012-SOC-TP3ND
2012-05-30MAY2012-SOC-TP1ND
2013-05-01MAY2013-OC-TP1ND
2013-05-01MAY2013-OC-TP2ND
2013-05-01MAY2013-OC-TP3ND
2013-07-08JUL2013-OC-TP1ND
2014-05-07MAY2014-OC-TP3ND
2014-05-07MAY2014-OC-TP2ND
2014-05-07MAY2014-OC-TP1ND
2015-05-19MAY2015-SOC-TP1ND
2015-05-19MAY2015-SOC-TP2ND
2015-05-19MAY2015-SOC-TP3ND
2016-05-17MAY2016--TP3ND
2016-05-17MAY2016--TP2ND
2016-06-20JUN2016--TP1ND
2017-05-16MAY2017--TP2ND
2017-05-16MAY2017--TP3ND
2017-07-12JUL2017--TP1ND