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EWG's Tap Water Database

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2,4-D

Missouri American St. Louis County & St. Charles County

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.

 

155

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.00588 ppb341ND - 0.200 ppb
20110.0375 ppb407ND - 0.300 ppb
20120.0524 ppb213ND - 0.500 ppb
20130.0450 ppb203ND - 0.300 ppb
20140.0350 ppb203ND - 0.300 ppb
20150.0250 ppb202ND - 0.300 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 20 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 70 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)70.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-02-02CO03738ND
2010-02-02CO03741ND
2010-04-21CP17950ND
2010-04-21CP17953ND
2010-04-21CP18010ND
2010-04-21CP180130.200 ppb
2010-04-22CP17885ND
2010-04-22CP17889ND
2010-04-22CP18100ND
2010-04-22CP18103ND
2010-04-22CP18114ND
2010-04-22CP18117ND
2010-07-20CP50765ND
2010-07-20CP50767ND
2010-07-21CP50511ND
2010-07-21CP50515ND
2010-07-21CP50655ND
2010-07-21CP50658ND
2010-08-09CP66568ND
2010-08-09CP66571ND
2010-08-09CP67805ND
2010-08-09CP67809ND
2010-08-16CP58480ND
2010-08-16CP58483ND
2010-10-04CP80282ND
2010-10-04CP80285ND
2010-10-05CP80216ND
2010-10-05CP80220ND
2010-10-05CP80343ND
2010-10-05CP80346ND
2010-10-05CP80448ND
2010-10-05CP80452ND
2010-10-05CR06274ND
2010-10-05CR06278ND
2011-01-12CR17728ND
2011-01-12CR17732ND
2011-01-12CR17796ND
2011-01-12CR17799ND
2011-01-12CR17857ND
2011-01-12CR178600.200 ppb
2011-01-12CR17948ND
2011-01-12CR179510.200 ppb
2011-01-12CR17962ND
2011-01-12CR179650.200 ppb
2011-04-05CS27069ND
2011-04-05CS27071ND
2011-04-05CS27130ND
2011-04-05CS271320.1000 ppb
2011-04-05CS27185ND
2011-04-05CS271870.200 ppb
2011-04-05CS27266ND
2011-04-05CS272690.300 ppb
2011-04-05CS27281ND
2011-04-05CS272830.300 ppb
2011-07-06CS61796ND
2011-07-06CS61800ND
2011-07-06CS61876ND
2011-07-06CS61879ND
2011-07-06CS61932ND
2011-07-06CS61935ND
2011-07-06CS62032ND
2011-07-06CS62035ND
2011-07-06CS62046ND
2011-07-06CS62050ND
2011-10-03CS99514ND
2011-10-03CS99517ND
2011-10-03CS99577ND
2011-10-03CS99580ND
2011-10-03CS99634ND
2011-10-03CS99637ND
2011-10-03CS99717ND
2011-10-03CS99720ND
2011-10-03CS99731ND
2011-10-03CS99734ND
2012-01-0515587401ND
2012-01-0515595501ND
2012-01-0515825501ND
2012-01-0515827901ND
2012-01-0515829001ND
2012-04-1016420801ND
2012-04-1017406801ND
2012-04-1017408601ND
2012-04-16161139010.500 ppb
2012-04-16161158010.400 ppb
2012-07-0517406901ND
2012-07-0517408701ND
2012-07-0519181001ND
2012-07-1117131901ND
2012-07-1716992701ND
2012-10-0919181101ND
2012-10-0919892901ND
2012-10-09198938010.200 ppb
2012-10-0919895001ND
2012-10-0919895601ND
2012-11-0520416001ND
2013-01-0920587901ND
2013-01-0920588301ND
2013-01-0920589001ND
2013-01-0920589501ND
2013-01-0920589701ND
2013-04-0221490601ND
2013-04-02214924010.300 ppb
2013-04-0321491501ND
2013-04-03214933010.300 ppb
2013-04-03214936010.300 ppb
2013-07-1022565501ND
2013-07-1022566201ND
2013-07-1022567001ND
2013-07-1022567801ND
2013-07-1022568101ND
2013-10-0823639201ND
2013-10-0823639701ND
2013-10-0823640501ND
2013-10-0823641401ND
2013-10-0823641701ND
2014-01-1524591301ND
2014-01-1524591701ND
2014-01-15245924010.300 ppb
2014-01-15245929010.200 ppb
2014-01-15245931010.200 ppb
2014-04-1525143101ND
2014-04-1525144001ND
2014-04-1525144301ND
2014-04-1625141301ND
2014-04-1625142201ND
2014-07-2226142901ND
2014-07-2226143601ND
2014-07-2226144401ND
2014-07-2226145201ND
2014-07-2226145501ND
2014-10-0827161801ND
2014-10-0927162101ND
2014-10-0927159601ND
2014-10-0927160101ND
2014-10-0927160901ND
2015-01-0627909801ND
2015-01-0627909601ND
2015-01-0727908401ND
2015-01-0727908001ND
2015-01-0727909101ND
2015-04-2228625501ND
2015-04-22286264010.200 ppb
2015-04-2228624601ND
2015-04-2228627301ND
2015-04-22286276010.300 ppb
2015-07-1329463501ND
2015-07-1329464401ND
2015-07-1329464701ND
2015-07-1629461801ND
2015-07-1629462601ND
2015-10-2630316401ND
2015-10-2630317401ND
2015-10-2630317701ND
2015-10-2730314901ND
2015-10-2730315501ND