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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Carson City Public Works

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.

 

123

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND490ND
2013ND90ND
2014ND60ND
2015ND470ND
2016ND20ND
2017ND100ND

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
2012-06-18201206210179-SND
2012-06-18201206210173-SND
2012-06-18201206210177-SND
2012-06-18201206210181-SND
2012-06-18201206210175-SND
2012-06-182012-6210171-SND
2012-06-19201206210314-SND
2012-06-1920120622025-SND
2012-06-19201206220012-SND
2012-06-19201206220010-SND
2012-06-21201206220323-SND
2012-06-21201206220321-SND
2012-06-25201206270438-SND
2012-06-252012-6270436-SND
2012-06-25201206270510-SND
2012-06-25201206270244-SND
2012-06-25201206270216-SND
2012-06-25201206270434-SND
2012-06-25201206270444-SND
2012-07-11201207130064-SND
2012-07-12201207140141-SND
2012-07-12201207140139-SND
2012-08-07201208100589-SND
2012-08-07201208100440-SND
2012-08-08201208100442-SND
2012-08-08201208100396-SND
2012-08-15201208170343-SND
2012-08-15201208170498-SND
2012-08-27201208300178-SND
2012-08-27201208300158-SND
2012-09-11201209130775-SND
2012-09-11201209130771-SND
2012-09-11201209130773-SND
2012-09-11201209130709-SND
2012-09-12201209130715-SND
2012-09-12201209140297-SND
2012-09-12201209150006-SND
2012-09-12201209150004-SND
2012-09-12201209150030-SND
2012-09-12201209150221-SND
2012-09-18201209200727-SND
2012-09-18201209200453-SND
2012-09-19201209200729-SND
2012-10-01201210020385-SND
2012-10-01201210020301-SND
2012-10-02201210040117-SND
2012-10-02201210030297-SND
2012-10-22201210230058-SND
2012-11-13201211150453-SND
2013-05-13201305140672-SND
2013-06-18201306190582-SND
2013-06-26201306270194-SND
2013-07-18201307200001-SND
2013-07-23201307240749ND
2013-09-09201309100461-SND
2013-09-24201309250203-SND
2013-09-25201309260254-SND
2013-09-30201310010188-SND
2014-02-24201402260926-SND
2014-05-27201405280593-SND
2014-05-27201405280345ND
2014-07-30201407310297ND
2014-08-06201408070473ND
2014-09-03201409040803ND
2015-05-19201505210392ND
2015-05-19201505210480ND
2015-05-19201505210341ND
2015-05-19201505210388ND
2015-05-20201505210403ND
2015-05-20201505210412ND
2015-05-20201505210405ND
2015-05-21201505220242ND
2015-05-21201505220202ND
2015-05-21201505220247ND
2015-06-01201506030407ND
2015-06-01201506030355ND
2015-06-01201506030247ND
2015-06-01201506030333ND
2015-06-09201506120280ND
2015-06-09201506120278ND
2015-06-11201506120209ND
2015-06-11201506120140ND
2015-06-29201506300124-SOCND
2015-06-29201506300177-SOCND
2015-06-30201507010430ND
2015-06-30201507160442ND
2015-08-04201508050421ND
2015-08-11201508130514ND
2015-08-11201508130887ND
2015-08-12201508130840ND
2015-08-12201508130715ND
2015-08-12201508130550ND
2015-08-13201508140374ND
2015-08-13201508140330ND
2015-08-13201508140232ND
2015-08-19201508200673ND
2015-08-19201508200613ND
2015-08-19201508200389ND
2015-08-27201508280218ND
2015-09-01201509030305ND
2015-09-01201509030285ND
2015-09-01201509030215ND
2015-09-23201509250297ND
2015-09-23201509250228ND
2015-09-23201509250220ND
2015-09-23201509250224ND
2015-09-24201509250171ND
2015-09-24201509250185ND
2015-09-24201509250183ND
2015-10-06201510070375ND
2015-10-13201510140575ND
2016-06-22201606230265-SOCND
2016-10-11201610121069ND
2017-05-15201705160571ND
2017-05-16201705170782ND
2017-07-19201707200484ND
2017-07-20201707210486ND
2017-08-01201708021373ND
2017-08-29201708300722ND
2017-08-29201708300813ND
2017-08-29201708300644ND
2017-10-04201710050218ND
2017-10-04201710050544ND