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EWG's Tap Water Database — 2019 UPDATE

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2,4-D

St. Louis City

2,4-D (2,4-dichlorophenoxyacetic acid) is a herbicide that can be applied directly to GMO corn and soy plants engineered to withstand this toxic chemical. Americans' exposures to 2,4-D from food and drinking water will likely increase in years to come as farmers plant more of these GMO crops. Read More.

2,4-D is an endocrine disruptor that interferes with thyroid hormones. The International Agency for Research on Cancer classifies 2,4-D as possibly carcinogenic to humans. In occupational studies, farmers exposed to 2,4-D tended to have higher incidences of damaged and malformed sperm. Laboratory animals exposed to 2,4-D during gestation are born underdeveloped and are more likely to have birth defects.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND10ND
2014ND20ND
2015ND40ND
2016ND100ND
2017ND80ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 20 ppb

The EWG Health Guideline of 20 ppb for 2,4-D 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) 70 ppb

The legal limit for 2,4-D, established in 1991, was based on toxicity studies in laboratory animals conducted in the 1980s. This limit may not fully protect against harm to the nervous system, harm to the thyroid, and hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2012-05-09AB71796ND
2012-05-09AB71797ND
2013-05-06AB97904ND
2014-06-02AC23738ND
2014-06-02AC23739ND
2015-06-01AC47107ND
2015-06-01AC47106ND
2015-09-22CRCW092215M515ND
2015-09-22HBCB092215M515ND
2016-03-03HBCB030316M515ND
2016-03-04CRCW030416M515ND
2016-06-06AC75865ND
2016-06-06AC75864ND
2016-06-08CRCW060816M515ND
2016-06-08HBCB060816M515ND
2016-09-30HBCB093016M515ND
2016-09-30CRCW093016M515ND
2016-12-28CRCW122816M515ND
2016-12-28HBCB122816M515ND
2017-05-19AC98045ND
2017-05-19AC98044ND
2017-06-21AC99038ND
2017-06-21AC99039ND
2017-09-29HBCB092917M515ND
2017-09-29CRCW092917M515ND
2017-11-15CRCW111517M515ND
2017-11-15HBCB111517M515ND