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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Cedar Rapids Water Department

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.

 

156

Samples

0

Samples exceeding legal limit (MCL)

29

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0143 ppb284ND - 0.1000 ppb
20130.108 ppb268ND - 0.700 ppb
20140.165 ppb2619ND - 0.600 ppb
20150.0417 ppb246ND - 0.200 ppb
20160.0577 ppb267ND - 0.500 ppb
20170.0308 ppb265ND - 0.200 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG 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.

EPA Maximum Contaminant
Level (MCL) 3 ppb

The legal limit for atrazine, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s. This limit does not fully protect against harm to the reproductive system, harm to the developing fetus, and hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-101882659ND
2012-01-101882660ND
2012-02-081887033ND
2012-02-281889286ND
2012-03-061889406ND
2012-03-061889409ND
2012-04-111897196ND
2012-04-111897198ND
2012-05-0819019600.1000 ppb
2012-05-081901961ND
2012-05-091902635ND
2012-05-091902637ND
2012-06-051908162ND
2012-06-051908163ND
2012-07-1019152750.1000 ppb
2012-07-1019152760.1000 ppb
2012-08-071922558ND
2012-08-0719225730.1000 ppb
2012-09-041928956ND
2012-09-041928957ND
2012-10-091937751ND
2012-10-091937752ND
2012-10-311943769ND
2012-10-311943771ND
2012-11-051942050ND
2012-11-061942049ND
2012-12-041948333ND
2012-12-041948335ND
2013-01-081953896ND
2013-01-081953897ND
2013-02-051961481ND
2013-02-051961482ND
2013-03-061964753ND
2013-03-061964756ND
2013-04-021971853ND
2013-04-021971854ND
2013-05-011974574ND
2013-05-011974576ND
2013-06-1119842850.700 ppb
2013-06-1119842870.300 ppb
2013-07-0919886320.600 ppb
2013-07-0919886330.500 ppb
2013-08-0720010900.200 ppb
2013-08-0720010910.200 ppb
2013-09-0420027510.200 ppb
2013-09-042002752ND
2013-09-102005694ND
2013-09-102005696ND
2013-10-0120095410.1000 ppb
2013-10-012009542ND
2013-11-052015734ND
2013-11-052015736ND
2013-12-032023205ND
2013-12-032023206ND
2014-01-082028391ND
2014-01-082028393ND
2014-02-0420323140.1000 ppb
2014-02-042032315ND
2014-03-0420389140.200 ppb
2014-03-0420389150.200 ppb
2014-04-0120437020.1000 ppb
2014-04-0120437030.200 ppb
2014-05-062051482ND
2014-05-062051484ND
2014-06-1020579240.300 ppb
2014-06-1020579250.400 ppb
2014-07-1520648010.600 ppb
2014-07-1520648020.500 ppb
2014-08-0620715660.300 ppb
2014-08-0620715670.400 ppb
2014-09-0320761090.200 ppb
2014-09-0320761100.200 ppb
2014-10-0820853980.1000 ppb
2014-10-0820854010.1000 ppb
2014-10-0820842870.1000 ppb
2014-10-0820842890.1000 ppb
2014-11-0420893980.1000 ppb
2014-11-042089399ND
2014-12-022094999ND
2014-12-0220950000.1000 ppb
2015-01-06OE208981ND
2015-01-06OE208979ND
2015-02-03OE212653ND
2015-02-03OE212654ND
2015-03-10OE219210ND
2015-03-10OE219211ND
2015-04-07OE228731ND
2015-04-07OE228729ND
2015-05-05OE240279ND
2015-05-05OE240278ND
2015-06-02OE250978ND
2015-06-02OE2509800.200 ppb
2015-07-07OE2651970.200 ppb
2015-07-07OE2651950.200 ppb
2015-08-04OE2772000.200 ppb
2015-08-05OE277199ND
2015-09-01OE2886500.1000 ppb
2015-09-01OE2886510.1000 ppb
2015-10-06OE302401ND
2015-10-06OE302405ND
2015-10-06OE302403ND
2015-10-06OE302404ND
2015-11-03OE314505ND
2015-11-03OE314506ND
2016-01-05OE333112ND
2016-01-05OE333114ND
2016-02-02OE341813ND
2016-02-02OE341812ND
2016-03-01OE351023ND
2016-03-01OE351024ND
2016-04-05OE363125ND
2016-04-05OE363126ND
2016-05-03OE374503ND
2016-05-03OE374504ND
2016-06-07OE3872860.1000 ppb
2016-06-07OE3872840.1000 ppb
2016-07-05OE3972610.500 ppb
2016-07-05OE3972600.300 ppb
2016-08-02OE4105820.200 ppb
2016-08-02OE4105810.200 ppb
2016-09-06OE425334ND
2016-09-06OE4253350.1000 ppb
2016-10-10OE438462ND
2016-10-10OE438459ND
2016-10-17OE441633ND
2016-10-17OE441634ND
2016-11-01OE448206ND
2016-11-01OE448207ND
2016-12-06OE459323ND
2016-12-06OE459322ND
2017-01-03OE467516ND
2017-01-03OE467517ND
2017-02-07OE479086ND
2017-02-07OE479088ND
2017-03-07OE488542ND
2017-03-07OE488543ND
2017-04-04OE498242ND
2017-04-04OE498243ND
2017-05-02OE508278ND
2017-05-02OE508280ND
2017-06-06OE521220ND
2017-06-06OE5212220.1000 ppb
2017-07-05OE5328440.200 ppb
2017-07-05OE5328450.200 ppb
2017-08-01OE5451400.200 ppb
2017-08-01OE5451390.1000 ppb
2017-09-12OE564049ND
2017-09-12OE564051ND
2017-10-03OE573413ND
2017-10-03OE573418ND
2017-11-07OE588322ND
2017-11-07OE588323ND
2017-11-20OE592397ND
2017-11-20OE592396ND
2017-12-12OE600497ND
2017-12-12OE600498ND