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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

City of Scottsdale

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.

 

55

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND290ND
2015ND50ND
2016ND20ND
2017ND190ND

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
2014-02-124021496-01ND
2014-02-26AB46248ND
2014-02-26AB46247ND
2014-02-26AB46246ND
2014-02-26AB46245ND
2014-02-264022124-04ND
2014-02-264022124-03ND
2014-03-134031189-01SND
2014-03-174031528-01ND
2014-03-184031529-01SND
2014-03-194031630-01ND
2014-03-20AB46813ND
2014-03-20AB46812ND
2014-04-024040226-02ND
2014-04-024040226-01ND
2014-06-034060399-01ND
2014-08-054080531-01ND
2014-08-054080529-01ND
2014-08-054080527-01ND
2014-08-074080785-03ND
2014-08-074080785-02ND
2014-08-074080785-01ND
2014-08-144081396-01ND
2014-08-214081971-01ND
2014-08-264082445-01ND
2014-08-274082450-01ND
2014-11-10201411100040SND
2014-12-044120615-01ND
2014-12-114121190-01ND
2015-01-135011106-02ND
2015-01-265012122-01ND
2015-02-045020551-01ND
2015-06-15201506150242SND
2015-07-28201507290355SND
2016-02-186022242-01ND
2016-02-226022243-01ND
2017-01-23201701230480SND
2017-01-31201701310419SND
2017-03-13201703130443SND
2017-04-11201704121085SND
2017-04-18201704180733SND
2017-05-03201705030393SND
2017-05-03201705030386SND
2017-05-11201705110565SND
2017-05-25AB75560SOCND
2017-08-10AB77938ND
2017-10-04AB79506SOCND
2017-10-10AB79627SOCND
2017-10-10AB79620ND
2017-11-01201711030277SND
2017-11-01201711030275SND
2017-11-09201711090343SND
2017-11-27201711280176SND
2017-11-29201711290299SND
2017-11-30201711300204SND