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EWG's Tap Water Database

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Atrazine

Missouri American St. Louis County & St. Charles County

Atrazine is a herbicide commonly detected in drinking water that comes from cornfield and other agricultural runoff. It is a hormone disrupter that harms the male and female reproductive systems of people and wildlife. Read More.

Federal laws allow up to 3 parts per billion of atrazine in treated tap water. Water suppliers average atrazine measurements collected over a year, which means that the reported values underestimate intense spikes of elevated exposures during the periods in late spring and early summer when atrazine is applied in large amounts on farm fields.

Human epidemiological studies suggest that federal standards for atrazine are insufficient to protect public health. In 1999 the California Office of Environmental Health Hazard Assessment set a public health goal of 0.15 parts per billion for atrazine in drinking water, based on a study finding increased rates of breast cancer in rats exposed to the chemical. California's legal maximum for atrazine in tap water is 1 ppb.

Click here to read more about atrazine.

 

117

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.1000 ppb176ND - 0.400 ppb
20110.200 ppb2013ND - 1.10 ppb
20120.160 ppb2012ND - 0.600 ppb
20130.110 ppb208ND - 0.700 ppb
20140.0850 ppb2010ND - 0.200 ppb
20150.125 ppb209ND - 0.500 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.1 ppb

The health guideline of 0.1 ppb for atrazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water.. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 3 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)3 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
2010-04-21CP17950ND
2010-04-21CP18010ND
2010-04-22CP17885ND
2010-04-22CP18100ND
2010-04-22CP18114ND
2010-07-20CP507650.400 ppb
2010-07-21CP50511ND
2010-07-21CP506550.400 ppb
2010-08-09CP66568ND
2010-08-09CP678050.300 ppb
2010-08-16CP58480ND
2010-10-04CP80282ND
2010-10-05CP80216ND
2010-10-05CP803430.200 ppb
2010-10-05CP804480.200 ppb
2010-10-05CR062740.200 ppb
2011-01-12CR17728ND
2011-01-12CR17796ND
2011-01-12CR178570.1000 ppb
2011-01-12CR179480.1000 ppb
2011-01-12CR179620.200 ppb
2011-04-05CS27069ND
2011-04-05CS27130ND
2011-04-05CS271850.1000 ppb
2011-04-05CS272660.1000 ppb
2011-04-05CS272810.1000 ppb
2011-07-06CS617960.1000 ppb
2011-07-06CS618760.1000 ppb
2011-07-06CS619320.900 ppb
2011-07-06CS620320.900 ppb
2011-07-06CS620461.10 ppb
2011-10-03CS99514ND
2011-10-03CS99577ND
2011-10-03CS996340.1000 ppb
2011-10-03CS99717ND
2011-10-03CS997310.1000 ppb
2012-01-05155874010.1000 ppb
2012-01-0515595501ND
2012-01-0515825501ND
2012-01-05158279010.200 ppb
2012-01-05158290010.1000 ppb
2012-04-10164208010.200 ppb
2012-04-10174068010.200 ppb
2012-04-10174086010.200 ppb
2012-04-16161139010.600 ppb
2012-04-16161158010.500 ppb
2012-07-05174069010.300 ppb
2012-07-05174087010.300 ppb
2012-07-05191810010.400 ppb
2012-07-1117131901ND
2012-07-17169927010.1000 ppb
2012-10-0919181101ND
2012-10-0919892901ND
2012-10-0919893801ND
2012-10-0919895001ND
2012-10-0919895601ND
2013-01-0920587901ND
2013-01-0920588301ND
2013-01-0920589001ND
2013-01-0920589501ND
2013-01-0920589701ND
2013-04-0221490601ND
2013-04-02214924010.1000 ppb
2013-04-0321491501ND
2013-04-03214933010.1000 ppb
2013-04-03214936010.1000 ppb
2013-07-1022565501ND
2013-07-1022566201ND
2013-07-10225670010.700 ppb
2013-07-10225678010.500 ppb
2013-07-10225681010.500 ppb
2013-10-0823639201ND
2013-10-0823639701ND
2013-10-08236405010.1000 ppb
2013-10-0823641401ND
2013-10-08236417010.1000 ppb
2014-01-1524591301ND
2014-01-1524591701ND
2014-01-15245924010.1000 ppb
2014-01-15245929010.200 ppb
2014-01-15245931010.1000 ppb
2014-04-15251431010.200 ppb
2014-04-15251440010.200 ppb
2014-04-15251443010.200 ppb
2014-04-1625141301ND
2014-04-1625142201ND
2014-07-2226142901ND
2014-07-2226143601ND
2014-07-22261444010.200 ppb
2014-07-22261452010.200 ppb
2014-07-22261455010.200 ppb
2014-10-0827161801ND
2014-10-0927162101ND
2014-10-0927159601ND
2014-10-0927160101ND
2014-10-09271609010.1000 ppb
2015-01-06279098010.200 ppb
2015-01-06279096010.1000 ppb
2015-01-0727908401ND
2015-01-0727908001ND
2015-01-07279091010.1000 ppb
2015-04-2228624601ND
2015-04-22286273010.300 ppb
2015-04-22286276010.200 ppb
2015-04-2228625501ND
2015-04-22286264010.200 ppb
2015-07-13294635010.400 ppb
2015-07-13294644010.500 ppb
2015-07-13294647010.500 ppb
2015-07-1629461801ND
2015-07-1629462601ND
2015-10-2630316401ND
2015-10-2630317701ND
2015-10-2730314901ND
2015-10-2730315501ND
2015-10-2930782501ND