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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

City of Baltimore

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.

 

60

Samples

1

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.137 ppb114ND - 0.510 ppb
2013ND130ND
20140.650 ppb61ND - 3.90 ppb
20150.0250 ppb162ND - 0.210 ppb
2016ND60ND
2017ND80ND

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
2012-04-300300002_01_BC043ND
2012-04-300300002_02_BC043ND
2012-06-270300002_01_BC062ND
2012-06-270300002_02_BC0620.400 ppb
2012-07-090300002_01_07091ND
2012-07-090300002_02_070910.400 ppb
2012-07-100300002_01_00008ND
2012-07-100300002_02_000080.510 ppb
2012-09-140300002_02_091410.200 ppb
2012-09-140300002_01_09141ND
2012-09-260300002_01_99884ND
2013-02-280300002_01_00419ND
2013-02-280300002_02_00419ND
2013-06-050300002_01_BC060ND
2013-06-050300002_02_BC060ND
2013-06-280300002_02_03535ND
2013-06-280300002_02_BC062ND
2013-06-280300002_01_03535ND
2013-06-280300002_01_BC062ND
2013-09-230300002_02_04973ND
2013-09-230300002_02_COB09ND
2013-09-230300002_01_04973ND
2013-09-230300002_01_TREATND
2013-09-230300002_01_CB092ND
2014-01-290300002_02_00348ND
2014-01-290300002_01_00348ND
2014-02-040300002_01_TREATND
2014-06-300300002_02_PLTS13.90 ppb
2014-07-300300002_01_TREATND
2014-09-240300002_01_TREATND
2015-03-182060750003ND
2015-03-1820607500020.210 ppb
2015-03-182060750003BND
2015-06-032075366003ND
2015-06-032075366001ND
2015-06-032075366002ND
2015-06-032075366002BND
2015-06-032075366003BND
2015-06-22E15004053003ND
2015-06-22E15004053001ND
2015-09-102095329002ND
2015-09-1020953290030.190 ppb
2015-09-102095329001ND
2015-12-10PLTS_1ND
2015-12-10ASH_TND
2015-12-10PLT_2ND
2016-05-23E16004413004ND
2016-05-23E16004413006ND
2016-05-23E16004413002ND
2016-09-21TREATED_A_1ND
2016-09-21PLT_1ND
2016-09-21PLT_2ND
2017-04-20TREATED_A_AND
2017-04-20TREATED_T4_1ND
2017-04-20TREATED_T1_AND
2017-06-08TREATED_A_CND
2017-06-08PLANT_2ND
2017-06-12PLANT_1ND
2017-06-20E17005034001ND
2017-06-20E17005035001ND