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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Jordan Valley Water Conservancy District

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.

 

41

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND50ND
2014ND50ND
2015ND50ND
2016ND50ND
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 Result
2012-07-18ND
2012-12-12ND
2013-06-26ND
2013-06-26ND
2013-08-27ND
2013-10-29ND
2013-10-29ND
2014-01-02ND
2014-06-03ND
2014-06-04ND
2014-06-04ND
2014-07-15ND
2015-01-13ND
2015-02-11ND
2015-02-26ND
2015-07-07ND
2015-07-21ND
2016-01-06ND
2016-02-16ND
2016-04-05ND
2016-04-25ND
2016-07-18ND
2017-01-03ND
2017-01-03ND
2017-01-03ND
2017-01-03ND
2017-01-04ND
2017-01-04ND
2017-01-04ND
2017-01-04ND
2017-01-23ND
2017-01-23ND
2017-03-23ND
2017-04-11ND
2017-04-12ND
2017-05-03ND
2017-06-07ND
2017-06-08ND
2017-07-10ND
2017-07-12ND
2017-08-14ND