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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Salt Lake City Water System

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.

 

102

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
2013ND110ND
2014ND150ND
2015ND190ND
2016ND250ND
2017ND200ND

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
2012-06-01ND
2012-07-17ND
2012-07-17ND
2012-07-20ND
2012-07-20ND
2012-07-31ND
2012-07-31ND
2012-07-31ND
2012-08-29ND
2012-08-29ND
2012-08-29ND
2012-09-21ND
2013-01-25ND
2013-01-25ND
2013-04-15ND
2013-04-15ND
2013-04-23ND
2013-05-10ND
2013-05-15ND
2013-05-15ND
2013-06-28ND
2013-06-28ND
2013-07-30ND
2014-01-10ND
2014-01-31ND
2014-01-31ND
2014-05-23ND
2014-05-30ND
2014-05-30ND
2014-06-03ND
2014-06-06ND
2014-06-11ND
2014-06-25ND
2014-06-25ND
2014-07-09ND
2014-07-09ND
2014-07-09ND
2014-07-11ND
2015-01-23ND
2015-01-30ND
2015-01-30ND
2015-02-27ND
2015-05-01ND
2015-05-08ND
2015-05-15ND
2015-06-19ND
2015-06-19ND
2015-06-19ND
2015-06-19ND
2015-06-30ND
2015-06-30ND
2015-06-30ND
2015-06-30ND
2015-06-30ND
2015-07-10ND
2015-07-10ND
2015-07-10ND
2016-01-08ND
2016-01-08ND
2016-01-15ND
2016-02-12ND
2016-02-26ND
2016-03-25ND
2016-05-19ND
2016-05-19ND
2016-06-03ND
2016-06-03ND
2016-06-10ND
2016-06-10ND
2016-06-10ND
2016-06-24ND
2016-06-24ND
2016-06-24ND
2016-06-28ND
2016-06-28ND
2016-07-01ND
2016-07-08ND
2016-07-08ND
2016-07-13ND
2016-07-29ND
2016-07-29ND
2016-07-29ND
2017-01-13ND
2017-01-16ND
2017-03-06ND
2017-03-24ND
2017-06-09ND
2017-06-12ND
2017-06-16ND
2017-06-19ND
2017-06-19ND
2017-06-21ND
2017-06-23ND
2017-06-30ND
2017-06-30ND
2017-07-14ND
2017-07-14ND
2017-07-21ND
2017-07-25ND
2017-08-08ND
2017-08-22ND
2017-08-23ND