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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Warren Water District

NOTE: Warren Water District purchases water from Des Moines Water Works which is required to test for atrazine. Sample information shown below was taken by Des Moines Water Works.

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0333 ppb31ND - 0.1000 ppb
2013ND60ND
20140.1000 ppb52ND - 0.300 ppb
20150.0200 ppb51ND - 0.1000 ppb
2016ND70ND
2017ND20ND

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

NOTE: Warren Water District purchases water from Des Moines Water Works which is required to test for atrazine. Sample information shown below was taken by Des Moines Water Works.

Date Lab ID Result
2012-06-181911652ND
2012-07-241917689ND
2012-07-2419176900.1000 ppb
2013-05-301983931ND
2013-05-301983933ND
2013-07-181990831ND
2013-07-181990789ND
2013-08-192002239ND
2013-08-192002240ND
2014-06-1620589590.300 ppb
2014-07-092063410ND
2014-07-3020675730.200 ppb
2014-10-082085404ND
2014-10-272087768ND
2015-01-14OE210021ND
2015-05-18OE243845ND
2015-06-29OE260496ND
2015-07-13OE2663150.1000 ppb
2015-08-10OE277679ND
2016-06-27OE393751ND
2016-06-27OE393752ND
2016-08-08OE411603ND
2016-08-08OE411602ND
2016-09-30OE435256ND
2016-09-30OE435255ND
2016-11-04OE448692ND
2017-04-11OE500202ND
2017-12-15OE601645ND