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EWG's Tap Water Database — 2019 UPDATE

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2,4-D

Jefferson County PWSD 3

NOTE: Jefferson County PWSD 3 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for 2,4-d. Sample information shown below was taken by 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.

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0524 ppb213ND - 0.500 ppb
20130.0450 ppb203ND - 0.300 ppb
20140.0350 ppb203ND - 0.300 ppb
20150.0250 ppb202ND - 0.300 ppb
2016ND100ND
2017ND50ND

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

NOTE: Jefferson County PWSD 3 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for 2,4-d. Sample information shown below was taken by Missouri American St. Louis County & St. Charles County.

Date Lab ID Result
2012-01-0515587401ND
2012-01-0515595501ND
2012-01-0515825501ND
2012-01-0515827901ND
2012-01-0515829001ND
2012-04-1017408601ND
2012-04-1017406801ND
2012-04-1016420801ND
2012-04-16161139010.500 ppb
2012-04-16161158010.400 ppb
2012-07-0519181001ND
2012-07-0517408701ND
2012-07-0517406901ND
2012-07-1117131901ND
2012-07-1716992701ND
2012-10-0919895601ND
2012-10-0919895001ND
2012-10-09198938010.200 ppb
2012-10-0919892901ND
2012-10-0919181101ND
2012-11-0520416001ND
2013-01-0920589701ND
2013-01-0920589501ND
2013-01-0920589001ND
2013-01-0920588301ND
2013-01-0920587901ND
2013-04-0221490601ND
2013-04-02214924010.300 ppb
2013-04-0321491501ND
2013-04-03214933010.300 ppb
2013-04-03214936010.300 ppb
2013-07-1022568101ND
2013-07-1022567801ND
2013-07-1022567001ND
2013-07-1022566201ND
2013-07-1022565501ND
2013-10-0823641701ND
2013-10-0823641401ND
2013-10-0823640501ND
2013-10-0823639701ND
2013-10-0823639201ND
2014-01-1524591301ND
2014-01-1524591701ND
2014-01-15245924010.300 ppb
2014-01-15245929010.200 ppb
2014-01-15245931010.200 ppb
2014-04-1525144301ND
2014-04-1525144001ND
2014-04-1525143101ND
2014-04-1625141301ND
2014-04-1625142201ND
2014-07-2226145501ND
2014-07-2226145201ND
2014-07-2226144401ND
2014-07-2226143601ND
2014-07-2226142901ND
2014-10-0827161801ND
2014-10-0927160901ND
2014-10-0927160101ND
2014-10-0927159601ND
2014-10-0927162101ND
2015-01-0627909801ND
2015-01-0627909601ND
2015-01-0727909101ND
2015-01-0727908001ND
2015-01-0727908401ND
2015-04-2228625501ND
2015-04-22286264010.200 ppb
2015-04-2228624601ND
2015-04-2228627301ND
2015-04-22286276010.300 ppb
2015-07-1329464701ND
2015-07-1329464401ND
2015-07-1329463501ND
2015-07-1629461801ND
2015-07-1629462601ND
2015-10-2630316401ND
2015-10-2630317401ND
2015-10-2630317701ND
2015-10-2730315501ND
2015-10-2730314901ND
2016-01-0530936501ND
2016-01-0530937101ND
2016-01-0530937301ND
2016-01-1130935701ND
2016-01-1130935201ND
2016-04-0531777201ND
2016-04-0531776201ND
2016-04-2031779501ND
2016-04-2031779201ND
2016-04-2031778201ND
2017-04-1135123101ND
2017-04-1135121901ND
2017-04-1135122801ND
2017-04-1935120901ND
2017-04-1935119901ND