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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

City of Mesa

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.

 

101

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND620ND
2013ND50ND
2014ND20ND
2015ND300ND
2016ND20ND
2017N/A00N/A

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
2012-01-11201201110239SND
2012-01-11201201110240SND
2012-01-11201201110241SND
2012-01-11201201120251SND
2012-01-12201201120255SND
2012-01-12201201120256SND
2012-01-12201201120257SND
2012-01-12201201120258SND
2012-01-12201201120259SND
2012-01-18201201180247SND
2012-01-18201201180248SND
2012-01-18201201180249SND
2012-01-18201201180250SND
2012-01-19201201190191SND
2012-01-19201201190192SND
2012-01-23201201230037SND
2012-01-23201201230038SND
2012-01-23201201230039SND
2012-01-23201201230040SND
2012-01-24201201240277SND
2012-01-24201201240278SND
2012-01-24201201240279SND
2012-01-24201201240280SND
2012-02-16201202160414SND
2012-03-06201203070318SND
2012-03-07201203070322SND
2012-04-09201204090008SND
2012-04-16201204160112SND
2012-04-17201204170458SND
2012-04-17201204170459SND
2012-05-07201205070059SND
2012-05-08201205080126SND
2012-08-06201208060115SND
2012-08-06201208060116SND
2012-08-06201208060117SND
2012-08-07201208070366SND
2012-08-07201208070367SND
2012-08-08201208080564SND
2012-08-08201208080565SND
2012-08-13201208130183SND
2012-08-13201208130184SND
2012-08-13201208130185SND
2012-08-14201208140227SND
2012-08-14201208140228SND
2012-08-14201208140229SND
2012-08-15201208150501SND
2012-08-15201208150502SND
2012-08-15201208150503SND
2012-08-22201208220599SND
2012-08-22201208220600SND
2012-08-22201208220601SND
2012-08-27201208270027SND
2012-08-27201208270029SND
2012-08-28201208280357SND
2012-08-28201208280358SND
2012-08-30201208300258SND
2012-09-24201209240094SND
2012-10-01201210010105SND
2012-11-19201211190081SND
2012-11-19201211190082SND
2012-11-19201211190083SND
2012-11-20201211200157SND
2013-03-05201303050107SND
2013-03-05201303050108SND
2013-05-09201305100036SND
2013-07-16201307170487SND
2013-10-15201310150513SND
2014-02-12201402120615SND
2014-04-14201404140044SND
2015-02-04201502050419SND
2015-02-04201502050428SND
2015-02-09201502090089SND
2015-02-09201502090114SND
2015-02-09201502090116SND
2015-02-11201502120371SND
2015-04-01201504010555SND
2015-04-07201504070448SND
2015-04-07201504080338SND
2015-04-07201504080340SND
2015-04-14201504150237SND
2015-04-14201504150242SND
2015-04-21201504220401SND
2015-04-21201504220403SND
2015-04-29201504290425SND
2015-04-29201504290428SND
2015-07-07201507070352SND
2015-07-07201507070354SND
2015-07-14201507150044SND
2015-07-21201507210313SND
2015-07-21201507210315SND
2015-10-062015100060338SND
2015-10-06201510060339SND
2015-10-06201510060340SND
2015-10-12201510130288SND
2015-10-12201510130289SND
2015-10-14201510150131SND
2015-10-19201510200133SND
2015-10-21201510220130SND
2015-10-21201510220131SND
2016-06-08201606090223SND
2016-10-17201610180304SND