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EWG's Tap Water Database — 2019 UPDATE

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2,4-D

City of Phoenix

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.

 

95

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
2013ND100ND
2014ND240ND
2015ND50ND
2016ND30ND
20170.00826 ppb461ND - 0.380 ppb

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
2012-01-03201201030160SND
2012-01-10201201110316SND
2012-01-12201201120289SND
2012-01-25201201250414SND
2012-04-10201204110481SND
2012-07-17201207180351SND
2012-11-07201211070497SND
2013-01-09201301100205SND
2013-02-15201302150477SND
2013-02-15201302150470SND
2013-04-16201304160136SND
2013-04-16201304160126SND
2013-07-10201307100774SND
2013-07-17201307170559SND
2013-07-23201307230517SND
2013-10-21201310210142SND
2013-10-24201310240749SND
2014-01-064010287-01SND
2014-01-08201401080633SND
2014-01-14201401140446SND
2014-01-15201401170163SND
2014-01-15201401150538SND
2014-01-16201401160569SND
2014-01-16201401170154SND
2014-01-21201401210438SND
2014-01-21201401210420SND
2014-02-18201402180230SND
2014-02-19201402190360SND
2014-02-26201402260763SND
2014-04-07201404080429SND
2014-07-01201407010386SND
2014-07-01201407010325SND
2014-07-02201407020641SND
2014-07-03201407091008SND
2014-07-08201407090998SND
2014-07-09201407090991SND
2014-07-15201407150421SND
2014-07-16201407160712SND
2014-07-22201407220313SND
2014-07-23201407230697SND
2014-07-23201407230690SND
2015-01-13201501130248SND
2015-02-0320150203030364SND
2015-07-07201507080205SND
2015-07-08201507090341SND
2015-10-06201510060433SND
2016-01-05201601060238SND
2016-07-05201607050433SND
2016-10-05201610060252SND
2017-01-04201701050476SND
2017-01-04201701050451SND
2017-01-04201701050397SND
2017-01-04201701050377SND
2017-01-04201701040662SND
2017-01-05201701050486SND
2017-01-10201701100459SND
2017-01-10201701100451SND
2017-01-11201701120611SND
2017-01-11201701120604SND
2017-01-17201701180222SND
2017-01-17201701180215SND
2017-01-18201701180350SND
2017-01-18201701180238SND
2017-01-25201701250402SND
2017-01-25201701250389SND
2017-02-01201702010375SND
2017-02-08201702080306SND
2017-02-22201702220344SND
2017-03-28201703280849SND
2017-04-20201704200311SND
2017-04-27201704270401SND
2017-04-27201704270390SND
2017-07-05201707050526SND
2017-07-11201707110869SND
2017-07-11201707110863SND
2017-07-12201707130584SND
2017-07-12201707130578SND
2017-07-13201707130644SND
2017-07-13201707130608SND
2017-07-13201707130601SND
2017-07-13201707130597SND
2017-07-13201707130591SND
2017-07-18201707190869SND
2017-07-19201707190852SND
2017-07-26201707280155SND
2017-07-27201707280178SND
2017-07-27201707280165SND
2017-08-01201708020916SND
2017-08-01201708020901SND
2017-08-02201708030626SND
2017-08-02201708030620SND
2017-08-03201708030641SND
2017-10-10201710100359SND
2017-10-12201710120505S0.380 ppb
2017-11-07201711090409SND