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EWG's Tap Water Database — 2021 UPDATE

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Atrazine

Waipahu-Ewa-Waianae

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.

MORE ABOUT THIS CONTAMINANT

 

102

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND470ND
2015ND80ND
20160.00800 ppb51ND - 0.0400 ppb
2017ND380ND
2018ND10ND
2019ND30ND

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
2014-01-13201401150663ND
2014-01-15201401170377ND
2014-01-15201401170388ND
2014-01-18201401220225ND
2014-01-18201401220226ND
2014-01-18201401220227ND
2014-01-18201401220228ND
2014-01-21201401230462ND
2014-01-21201401230463ND
2014-01-21201401230464ND
2014-01-21201401230465ND
2014-01-24201401280404ND
2014-01-24201401280405ND
2014-01-24201401280453ND
2014-01-25201401280407ND
2014-01-26201401280406ND
2014-01-26201401280432ND
2014-01-29201401310166ND
2014-01-30201402010005ND
2014-02-18201402200355ND
2014-03-05201403070205ND
2014-04-04201404080622ND
2014-04-04201404080786ND
2014-07-08201407100610ND
2014-07-21201407230630ND
2014-07-23201407250222ND
2014-07-23201407250456ND
2014-08-21C14-08-0143ND
2014-08-21C14-08-0144AND
2014-09-09C14-09-0029AND
2014-09-09C14-09-0030ND
2014-10-06201410090199ND
2014-10-07201410090944ND
2014-10-08201410100303ND
2014-10-08201410100304ND
2014-10-20201410220436ND
2014-10-20201410220439ND
2014-10-22201410240309ND
2014-10-22201410240310ND
2014-10-24201410280161ND
2014-10-27201410290476ND
2014-10-27201410290477ND
2014-10-27201410290479ND
2014-10-27201410290481ND
2014-10-28201410300229ND
2014-10-28201410300231ND
2014-10-29201410310269ND
2015-04-21201504230309ND
2015-05-26201505280356ND
2015-07-13201507150498ND
2015-08-31201509020193ND
2015-08-31201509020194ND
2015-09-29201510010224ND
2015-11-30201512020821ND
2015-12-28201512180364ND
2016-11-14ND
2016-11-160.0400 ppb
2016-11-16ND
2016-11-16ND
2016-12-14ND
2017-01-09ND
2017-01-10ND
2017-01-10ND
2017-01-10ND
2017-01-11ND
2017-01-24ND
2017-01-24ND
2017-01-25ND
2017-01-26ND
2017-02-02ND
2017-02-08ND
2017-02-13ND
2017-02-13ND
2017-02-16ND
2017-02-22ND
2017-02-22ND
2017-02-23ND
2017-02-27ND
2017-03-14ND
2017-03-15ND
2017-10-09ND
2017-10-11ND
2017-10-13ND
2017-10-13ND
2017-10-16ND
2017-10-16ND
2017-10-16ND
2017-10-16ND
2017-10-17ND
2017-10-18ND
2017-10-18ND
2017-10-23ND
2017-10-24ND
2017-10-24ND
2017-10-24ND
2017-10-25ND
2017-10-25ND
2017-10-30ND
2018-08-21201808130257ND
2019-01-30201901310262ND
2019-04-08201904100407ND
2019-07-30201908010178ND