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EWG's Tap Water Database — 2021 UPDATE

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2,4-D

Morgan City Water System

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.

 

26

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
2015ND60ND
2016ND40ND
2017ND40ND
2018ND60ND
2019ND40ND

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
2014-02-03AD88684ND
2014-02-03AD88684ND
2015-03-3135181766002ND
2015-03-3135181766002ND
2015-06-0835192498002ND
2015-06-0835192498002ND
2015-09-2435208879007ND
2015-09-2435208879007ND
2016-02-0135227537001ND
2016-02-0135227537001ND
2016-09-1935266189007ND
2016-09-1935266189007ND
2017-01-3135292293002ND
2017-01-3135292293002ND
2017-10-1635342351002ND
2017-10-1635342351002ND
2018-01-2535370415007ND
2018-01-2535370415007ND
2018-05-0335390205001ND
2018-05-0335390205001ND
2018-07-2335406291001ND
2018-07-2335406291001ND
2019-01-2935445061001ND
2019-01-2935445061001ND
2019-07-2435484849001ND
2019-07-2435484849001ND