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EWG's Tap Water Database

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Atrazine

South Hero Fire District 4

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010N/A00N/A
2011N/A00N/A
20120.0825 ppb43ND - 0.130 ppb
20130.0875 ppb43ND - 0.130 ppb
20140.0533 ppb31ND - 0.160 ppb
2015ND50ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.1 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 3 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)3 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2012-03-1312S1740.130 ppb
2012-06-1812S1900.1000 ppb
2012-09-1213S000930.1000 ppb
2012-12-1013S00139ND
2013-02-1213S00167ND
2013-05-1413S002120.1000 ppb
2013-08-1414S000450.130 ppb
2013-11-1214S001110.120 ppb
2014-02-1114S00132ND
2014-08-1215S000470.160 ppb
2014-11-0915S00141ND
2015-02-0915S00165ND
2015-03-251503-05470-001ND
2015-05-1215S00202ND
2015-08-1816S00036ND
2015-11-1116S00087ND