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EWG's Tap Water Database — 2019 UPDATE

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2,4-D

City of Houston

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.

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND100ND
2014ND320ND
2015ND10ND
2016ND100ND
2017ND380ND

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
2012-01-31AB79819ND
2013-02-25AC11605ND
2013-02-25AC11606ND
2013-02-25AC11603ND
2013-02-25AC11604ND
2013-02-25AC11602ND
2013-02-26AC11815ND
2013-03-11AC12928ND
2013-03-11AC12937ND
2013-03-11AC12929ND
2013-03-11AC12926ND
2014-03-14AC47173ND
2014-04-16AC50891ND
2014-04-16AC50893ND
2014-04-16AC50899ND
2014-04-16AC50892ND
2014-04-17AC51139ND
2014-04-17AC51142ND
2014-04-17AC51144ND
2014-04-17AC51140ND
2014-04-17AC51141ND
2014-04-17AC51150ND
2014-04-17AC51138ND
2014-04-17AC51143ND
2014-06-03AC55820ND
2014-07-16AC59859ND
2014-08-14AC63734ND
2014-08-14AC63738ND
2014-08-14AC63737ND
2014-08-14AC63740ND
2014-10-08AC69225ND
2014-10-08AC69228ND
2014-10-08AC69224ND
2014-10-09AC69380ND
2014-10-09AC69377ND
2014-10-09AC69376ND
2014-10-09AC69375ND
2014-10-09AC69378ND
2014-10-09AC69379ND
2014-12-09AC74240ND
2014-12-09AC74239ND
2014-12-09AC74238ND
2014-12-18AC75473ND
2015-03-04AC83017ND
2016-02-18AD24477ND
2016-03-03AD26975ND
2016-03-16AD29178ND
2016-03-16AD29181ND
2016-03-17AD29414ND
2016-03-23AD30221ND
2016-09-20AD50441ND
2016-09-20AD50440ND
2016-09-21AD50866ND
2016-10-06AD52699ND
2017-01-26AD67274ND
2017-01-26AD67268ND
2017-01-26AD67273ND
2017-01-26AD67267ND
2017-02-28AD72569ND
2017-03-02AD73241ND
2017-03-28AD77238ND
2017-03-28AD77237ND
2017-03-28AD77248ND
2017-03-28AD77249ND
2017-03-28AD77239ND
2017-03-29AD77533ND
2017-03-29AD77531ND
2017-03-29AD77530ND
2017-03-29AD77532ND
2017-04-26AD81269ND
2017-04-27AD81577ND
2017-04-27AD81578ND
2017-07-06AD88535ND
2017-07-06AD88537ND
2017-07-26AD90913ND
2017-09-11AD95592ND
2017-09-11AD95597ND
2017-09-11AD95595ND
2017-09-11AD95593ND
2017-09-11AD95596ND
2017-09-11AD95599ND
2017-09-26AD98109ND
2017-09-26AD98108ND
2017-11-07AE03918ND
2017-11-07AE03920ND
2017-11-07AE03917ND
2017-11-07AE03916ND
2017-11-07AE03919ND
2017-11-07AE03921ND
2017-11-14AE04808ND
2017-12-04AE06625ND
2017-12-04AE06626ND