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EWG's Tap Water Database — 2021 UPDATE

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2,4-D

Town of Gilbert

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.

 

67

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND20ND
2015ND200ND
2016ND80ND
2017ND20ND
2018ND220ND
20190.0615 ppb132ND - 0.650 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
2014-01-27201401270088SND
2014-10-07201410070504SND
2015-01-13201501130297SND
2015-01-14201501140577SND
2015-01-27201501270263SND
2015-01-28201501280380SND
2015-01-28201501280358SND
2015-02-03201502030356SND
2015-02-05201502050484SND
2015-02-10201502100324SND
2015-02-17201502170339SND
2015-02-18201502180275SND
2015-02-24201502240346SND
2015-02-24201502240342SND
2015-05-13201505130231SND
2015-07-08201507080265SND
2015-07-21201507220465SND
2015-07-28201507260234SND
2015-08-17201508170183SND
2015-09-10201509100492SND
2015-09-10201509100491SND
2015-09-10201509100490SND
2016-01-05201601070012SND
2016-01-06201601070016SND
2016-01-26201601260359SND
2016-05-31201605310476SND
2016-07-06201607060612SND
2016-07-06201607060594SND
2016-07-20201607200605SND
2016-10-18201610180285SND
2017-01-04201701040825SND
2017-07-27201707280101SND
2018-01-16201801160487SND
2018-01-24201801240722SND
2018-01-24201801240714SND
2018-01-29201801290262SND
2018-01-29201801290253SND
2018-01-29201801290248SND
2018-02-26201802260223SND
2018-02-27201802270506SND
2018-03-20201803200265SND
2018-05-17201805170729SND
2018-06-13201806131022SND
2018-07-30201807300086SND
2018-07-31201807310397SND
2018-07-31201807310394SND
2018-08-01201808010288SND
2018-08-01201808010286SND
2018-08-22201808220261SND
2018-08-28201808280711SND
2018-08-29201808290654SND
2018-08-29201808290652SND
2018-11-28201811280390SND
2018-12-03201812040072SND
2019-01-09201901090388SND
2019-01-15201901150228S0.650 ppb
2019-02-06201902060210SND
2019-03-25201903250206SND
2019-04-16201904160429SND
2019-04-29201904290297SND
2019-04-29201904290294SND
2019-07-10201907100660SND
2019-07-17201907170335SND
2019-07-30201907300444SND
2019-08-20201908200311S0.150 ppb
2019-10-22201910220181SND
2019-12-16201912160222SND