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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

City of Grand Prairie

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0983 ppb63ND - 0.240 ppb
20130.177 ppb32ND - 0.280 ppb
20140.144 ppb54ND - 0.300 ppb
20150.104 ppb105ND - 0.400 ppb
20160.0367 ppb61ND - 0.220 ppb
20170.0800 ppb54ND - 0.1000 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
2012-03-0712032550040.170 ppb
2012-03-0712032550050.180 ppb
2012-03-0712032550030.240 ppb
2012-08-131208543009ND
2012-08-131208543008ND
2012-08-131208543007ND
2013-02-1913025710040.280 ppb
2013-02-1913025710030.250 ppb
2013-04-291304A10006ND
2014-04-23Q14129910030.300 ppb
2014-06-04Q14193310030.150 ppb
2014-06-26Q14240230420.120 ppb
2014-06-26Q14240230070.150 ppb
2014-09-10Q1442991006ND
2015-03-11Q15090640030.400 ppb
2015-06-09Q15210420020.210 ppb
2015-06-09Q15210420010.0900 ppb
2015-07-14Q15269360130.160 ppb
2015-07-14Q1526936012ND
2015-07-14Q1526936011ND
2015-07-14Q1526936010ND
2015-07-14Q15269360090.180 ppb
2015-10-07Q1539391002ND
2015-10-07Q1539391001ND
2016-01-14Q1601729002ND
2016-01-14Q1601729001ND
2016-03-01Q1608611001ND
2016-04-06Q1613635009ND
2016-07-14Q16287120030.220 ppb
2016-12-05Q1652555003ND
2017-01-05Q1700632003ND
2017-01-05Q17006320170.1000 ppb
2017-06-27Q17265350260.1000 ppb
2017-06-27Q17265350250.1000 ppb
2017-06-27Q17265350010.1000 ppb