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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

City of Surprise - Mountain Vista

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.

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND160ND
2013ND160ND
2014ND160ND
2015ND120ND
2016ND170ND
2017ND150ND

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
2012-01-262012012-04SND
2012-01-262012012-03SND
2012-01-262012012-02SND
2012-01-262012012-01SND
2012-04-252042001-01SND
2012-04-252042000-01SND
2012-04-252041999-01SND
2012-04-252041994-01SND
2012-08-152081291-01SND
2012-08-152081287-01SND
2012-08-162081359-01SND
2012-09-042090143-01SND
2012-11-142111028-01SND
2012-11-142111027-01SND
2012-11-142111026-01SND
2012-11-142111024-01SND
2013-01-233011767-04ND
2013-01-233011767-03ND
2013-01-233011767-02ND
2013-01-233011767-01ND
2013-04-243041986-01SND
2013-04-243041985-01SND
2013-04-243041987-01SND
2013-04-243041989-01SND
2013-07-163071369-01SND
2013-07-163071367-01SND
2013-07-163071366-01SND
2013-07-163071362-01SND
2013-10-173101633-01ND
2013-10-173101632-01ND
2013-10-173101631-01ND
2013-10-173101630-01ND
2014-01-224011817-04SND
2014-01-224011817-01SND
2014-01-224011817-02SND
2014-01-224011817-03SND
2014-04-224041931-01ND
2014-04-224041930-01ND
2014-04-224041927-01ND
2014-04-234041928-01ND
2014-07-304072667-01SND
2014-07-304072665-01SND
2014-07-304072658-01SND
2014-07-304072656-01SND
2014-10-284102394-01SND
2014-10-284102393-01SND
2014-10-284102387-01ND
2014-10-294102491-01SND
2015-01-215011694-04ND
2015-04-205041746-01SND
2015-04-205041743-01SND
2015-04-205041742-01ND
2015-04-205041741-01ND
2015-07-285072564-01SND
2015-07-295072676-01SND
2015-07-295072682-01SND
2015-07-305072799-02SND
2015-10-125101379-01SND
2015-10-125101373-01ND
2015-10-125101369-01ND
2016-01-256012035-04TND
2016-01-256012035-03TND
2016-01-256012035-03SND
2016-01-256012035-02TND
2016-01-256012035-01TND
2016-04-266042222-01SND
2016-04-266042223-01SND
2016-04-266042227-01SND
2016-04-266042226-01SND
2016-07-266072329-01SND
2016-07-266072325-01SND
2016-07-266072323-01SND
2016-07-266072321-01SND
2016-10-246102137-01SND
2016-10-246102135-01SOCND
2016-10-246102133-01SND
2016-10-246102131-01SND
2017-01-307012591-03SND
2017-01-307012591-01SND
2017-01-307012591-02SND
2017-01-307012591-04SND
2017-04-207041996-01SOCND
2017-04-207041995-01SOCND
2017-04-207041987-01SOCND
2017-07-197071806-01SOCND
2017-07-197071805-01SOCND
2017-07-197071804-01SOCND
2017-07-197071802-01SOCND
2017-10-117101207-01SOCND
2017-10-117101207-04SOCND
2017-10-117101207-03SOCND
2017-10-117101207-02SOCND