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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Indiana American Water - Richmond

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.

 

58

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.171 ppb146ND - 0.700 ppb
20130.188 ppb84ND - 0.700 ppb
20140.175 ppb84ND - 0.800 ppb
20150.0571 ppb144ND - 0.300 ppb
20160.117 ppb63ND - 0.300 ppb
20170.425 ppb84ND - 3.00 ppb

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
2012-02-13155554RS525-12010.1000 ppb
2012-02-13155553RS525-1201ND
2012-04-16167623RS28-1202ND
2012-04-16167627RS28-1202ND
2012-04-16167625RS28--12020.1000 ppb
2012-05-16171735RS525-1202ND
2012-05-16171745RS525-12020.700 ppb
2012-07-16167628RS28-1203ND
2012-07-16167624RS28-1203ND
2012-07-16167626RS28-12030.600 ppb
2012-08-13171736RS-1203ND
2012-08-15171746RS-12030.500 ppb
2012-11-13199009RS525-12040.400 ppb
2012-11-13199006RS525-1204ND
2013-02-13207558RS525-1301ND
2013-02-13207559RS525-13010.200 ppb
2013-05-14218976RS525-13020.1000 ppb
2013-05-14218975RS525-1302ND
2013-08-12231826RS525-1303ND
2013-08-12231828RS525-13030.700 ppb
2013-11-13240514RS525-13040.500 ppb
2013-11-13240513RS525-1304ND
2014-02-10247668RS525-1401ND
2014-02-10247669RS525-14010.200 ppb
2014-05-12256299RS525-14020.1000 ppb
2014-05-12256298RS525-1402ND
2014-08-12265615RS525-14030.800 ppb
2014-08-12265614RS525-1403ND
2014-11-12274883RS525-14040.300 ppb
2014-11-12274881RS525-1404ND
2015-02-09281655RS525-15010.200 ppb
2015-02-09281653RS525-1501ND
2015-04-0728647101RS28-150ND
2015-04-0728646701RS28-150ND
2015-04-0728646201RS28-150ND
2015-05-1228894401RS525-15ND
2015-05-1228894601RS525-150.1000 ppb
2015-07-1539499201RS28-150ND
2015-07-1529499501RS28-150ND
2015-07-21294999RV-1503ND
2015-08-1029927801RS525-150.300 ppb
2015-08-1029927601RS-1503ND
2015-11-09305397RS525-15040.200 ppb
2015-11-09305395RS525-1504ND
2016-05-09318680RS525-1602ND
2016-05-09318682RS525-16020.200 ppb
2016-08-0932886801RS525-160.300 ppb
2016-08-0932886601RS525-16ND
2016-11-1433728301RS-16040.200 ppb
2016-11-1433728101RS-1604ND
2017-02-14345570RS525-17010.1000 ppb
2017-02-14345568RS525-1701ND
2017-05-08354292RS525-17023.00 ppb
2017-05-08354290RS525-1702ND
2017-08-15365881RS525-17030.200 ppb
2017-08-15365879RS525-1703ND
2017-11-13375901RS525-17040.1000 ppb
2017-11-14375899RS525-1704ND