Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Atrazine

Lee County WSC

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND20ND
2014N/A00N/A
2015ND90ND
2016ND60ND
2017ND80ND

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
2012-01-11AB77488ND
2012-01-11AB77486ND
2012-01-11AB77483ND
2012-01-11AB77482ND
2012-01-11AB77485ND
2013-10-14Q1308854030ND
2013-10-14Q1308854018ND
2015-03-04AC83057ND
2015-03-04AC83056ND
2015-03-04AC83055ND
2015-03-04AC83058ND
2015-06-17AC96431ND
2015-06-17AC96429ND
2015-06-17AC96427ND
2015-09-01AD05253ND
2015-10-15AD10881ND
2016-01-27AD20522ND
2016-01-27AD20519ND
2016-04-12AD32913ND
2016-04-12AD32912ND
2016-07-26AD45813ND
2016-10-31AD55672ND
2017-01-30AD67684ND
2017-01-30AD67683ND
2017-05-04AD82881ND
2017-05-30AD86010ND
2017-07-24AD90418ND
2017-07-24AD90417ND
2017-10-26AE02515ND
2017-10-26AE02516ND