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EWG's Tap Water Database — 2021 UPDATE

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2,4-D

Norwich Public Utilities

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND20ND
2016ND20ND
2017ND80ND
2018ND20ND
2019ND20ND

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
2014-05-016300207SOC2ND
2014-05-016300208SOC2ND
2014-05-016300216SOCRND
2014-05-016300217SOCRND
2014-05-016300206SOC2ND
2014-09-106300380SOC2ND
2014-09-106300381SOC2ND
2014-09-106300382SOC2ND
2015-11-196301452SOCRND
2015-11-196301453SOCRND
2016-11-176302602SOCRND
2016-11-176302603SOCRND
2017-05-04PH-0453-6303174SND
2017-05-04PH-0453-6303176SND
2017-05-04PH-0453-6303175SND
2017-07-06PH-0453-6303367SND
2017-07-06PH-0453-6303368SND
2017-07-06PH-0453-6303369SND
2017-08-18PH-0453-6303370SND
2017-08-18PH-0453-6303371SND
2018-10-30PH-0453-6304745SND
2018-10-30PH-0453-6304746SND
2019-12-12PH-0453-6305859SND
2019-12-12PH-0453-6305860SND