Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

2,4-D

Lafourche Water District 1

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.

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
20150.183 ppb82ND - 0.730 ppb
20160.610 ppb84ND - 2.10 ppb
2017ND80ND
2018ND80ND
20190.0640 ppb84ND - 0.160 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
2014-02-03AD88683ND
2014-02-03AD88683ND
2014-02-24AD89294ND
2014-02-24AD89294ND
2014-10-06AD98270ND
2014-10-06AD98270ND
2015-03-3135181766005ND
2015-03-3135181766005ND
2015-06-08351924980040.730 ppb
2015-06-08351924980040.730 ppb
2015-09-2435208879009ND
2015-09-2435208879009ND
2015-10-1435212325002ND
2015-10-1435212325002ND
2016-03-01352321490010.340 ppb
2016-03-01352321490010.340 ppb
2016-03-15352343930052.10 ppb
2016-03-15352343930052.10 ppb
2016-11-1435277515002ND
2016-11-1435277515002ND
2016-11-2935279934001ND
2016-11-2935279934001ND
2017-01-3135292293005ND
2017-01-3135292293005ND
2017-02-1435295627001ND
2017-02-1435295627001ND
2017-10-1635342351004ND
2017-10-1635342351004ND
2017-11-0135345512001ND
2017-11-0135345512001ND
2018-01-2535370415009ND
2018-01-2535370415009ND
2018-02-2635377894001ND
2018-02-2635377894001ND
2018-07-2335406305001ND
2018-07-2335406305001ND
2018-08-2335413196001ND
2018-08-2335413196001ND
2019-01-2935445082001ND
2019-01-2935445082001ND
2019-02-18354493740010.0960 ppb
2019-02-18354493740010.0960 ppb
2019-07-2435484855001ND
2019-07-2435484855001ND
2019-08-28354940520010.160 ppb
2019-08-28354940520010.160 ppb