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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Pennsylvania American Royersford

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0500 ppb41ND - 0.200 ppb
2013ND10ND
2014ND110ND
2015ND10ND
2016ND10ND
2017ND110ND

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
2012-02-0816313101ND
2012-04-1017210401ND
2012-07-10172105010.200 ppb
2012-10-0219879001ND
2013-08-0823077301ND
2014-04-0225339901ND
2014-04-0225340101ND
2014-04-0325339801ND
2014-04-0325340201ND
2014-06-2525340401ND
2014-08-0526516201ND
2014-08-0526516601ND
2014-08-0626516401ND
2014-08-0626516701ND
2014-08-1226517201ND
2014-08-1226516501ND
2015-08-0613131569ND
2016-08-0414730041ND
2017-04-1115931433ND
2017-04-1115931461ND
2017-04-1115931489ND
2017-04-1115931517ND
2017-04-1115931547ND
2017-08-1516560795ND
2017-08-1516560910ND
2017-08-1516560823ND
2017-08-1516560851ND
2017-08-1616560879ND
2017-08-3116721934ND