Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Atrazine

North Penn Water Authority

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.

 

67

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND240ND
2015ND60ND
2016ND50ND
2017ND280ND

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
2012-04-0212040263ND
2012-04-0212040263ND
2013-04-0113040239-01ND
2013-04-0113040239-02ND
2014-04-2214040589-01ND
2014-04-2214030715-01ND
2014-04-2214030714-01ND
2014-04-2214040590-01ND
2014-04-2214030712-01ND
2014-04-2814040582-01ND
2014-04-2914040579-01ND
2014-04-2914030719-01ND
2014-04-2914030718-01ND
2014-04-2914030716-01ND
2014-05-1914041348-01ND
2014-06-0914060594-01ND
2014-07-071425943ND
2014-07-071425949ND
2014-07-071425953ND
2014-07-071425946ND
2014-07-071425942ND
2014-07-211427976ND
2014-07-211427975ND
2014-08-041431083ND
2014-08-2514082295-01ND
2014-08-2514082298-01ND
2014-08-2514082297-01ND
2014-08-2514082296-01ND
2015-04-0612633587ND
2015-04-0612633586ND
2015-04-0612750105ND
2015-04-0612750104ND
2015-07-0213013255ND
2015-12-0913633935ND
2016-04-0414102807ND
2016-04-0414102806ND
2016-09-1914908637ND
2016-12-2715372296ND
2016-12-2715372305ND
2017-01-1115517895ND
2017-04-0515936991ND
2017-04-0515937027ND
2017-04-0515937062ND
2017-04-0515937134ND
2017-04-0515937169ND
2017-04-0515936956ND
2017-04-0515937098ND
2017-04-1915937949ND
2017-04-1915937913ND
2017-04-1915938021ND
2017-04-1915937841ND
2017-04-1915937985ND
2017-04-1915937877ND
2017-07-1216414050ND
2017-07-1216413873ND
2017-07-1216414014ND
2017-07-1216413979ND
2017-07-1216413943ND
2017-07-1216413908ND
2017-07-1216414086ND
2017-07-1716414121ND
2017-07-1716414157ND
2017-07-1716414193ND
2017-07-1716414229ND
2017-07-1716414265ND
2017-07-1716414301ND
2017-10-0916880748ND