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EWG's Tap Water Database — 2021 UPDATE

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2,4-D

City of Kuna

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015ND60ND
2016ND30ND
2017ND50ND
2018ND30ND
2019ND10ND

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
2014-05-13S1416901ND
2015-03-13S1509638ND
2015-03-13S1509639ND
2015-03-13S1509640ND
2015-04-06S1512654ND
2015-04-06S1512655ND
2015-04-06S1512656ND
2016-02-26S1607873ND
2016-08-08S1635084ND
2016-10-05S1645684ND
2017-02-17S1706516ND
2017-02-17S1706515ND
2017-06-13S1724939ND
2017-09-26S1744576ND
2017-12-19S1758821ND
2018-03-26S1812803ND
2018-06-20S1828518ND
2018-09-25S1847685ND
2019-09-16S1946341ND