Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

2,4-D

Block Island Water Company

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND120ND
2016N/A00N/A
2017ND30ND
2018ND130ND
2019N/A00N/A

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
2014-09-10E409C65-2_SOCND
2014-11-12E411C57-1_SOCND
2015-03-11E503988-1_SOCND
2015-05-13E505E80-3_SOCND
2015-05-13E505E80-5_SOCND
2015-05-13E505E80-4_SOCND
2015-05-13E505E80-1_SOCND
2015-05-13E505E80-6_SOCND
2015-05-13E505E80-7_SOCND
2015-11-18E511L40-3_SOCND
2015-11-18E511L40-5_SOCND
2015-11-18E511L40-4_SOCND
2015-11-18E511L40-2_SOCND
2015-11-18E511L40-1_SOCND
2017-06-27D7F2727-01_SOCND
2017-08-16D7H2328-02_SOCND
2017-11-08D7K1021-01_SOCND
2018-02-07D8B0696-02_SOCND
2018-04-11D8D1179-01_SOCND
2018-04-11D8D1183-01_SOCND
2018-04-11D8D1177-01_SOCND
2018-04-11D8D1180-01_SOCND
2018-04-11D8D1178-01_SOCND
2018-04-11D8D1181-01_SOCND
2018-11-141811-1745-1_SOCND
2018-11-141811-1744-1_SOCND
2018-11-141811-1746-1_SOCND
2018-11-141811-1742-1_SOCND
2018-11-141811-1741-1_SOCND
2018-12-121812-1495-5_SOCND