Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

2,4-D

Southern Nevada 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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND90ND
2016ND70ND
2017ND50ND
2018ND60ND
2019ND50ND

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
2014-02-1814020225-002ND
2014-02-1814020235-002ND
2014-08-1814080245-003ND
2014-08-1914080292-002ND
2015-02-1715020219-002ND
2015-02-1815020285-003ND
2015-05-0415040556-001ND
2015-08-2415080364-003ND
2015-08-2615080480-002ND
2015-09-2815090448-002AND
2015-09-2815090448-003AND
2015-12-2115120302-002ND
2015-12-2115120302-003ND
2016-02-0816020070-003ND
2016-02-0916020130-002ND
2016-05-2316050225-002ND
2016-05-2316050225-003ND
2016-08-09S1604052001ND
2016-08-09S1603584002ND
2016-08-09S1603584001ND
2017-05-22S1701203003ND
2017-05-22S1701203002ND
2017-08-28S1703629001ND
2017-08-28S1703629003ND
2017-08-28S1703629002ND
2018-02-06S1708762003ND
2018-02-06S1708762002ND
2018-02-06S1708762001ND
2018-08-07S1803807001ND
2018-08-07S1803807002ND
2018-08-07S1803807003ND
2019-02-12S1805444002ND
2019-02-12S1805444003ND
2019-02-12S1805444001ND
2019-08-13S1922741003ND
2019-08-13S1922741002ND