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EWG's Tap Water Database

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Atrazine

Warminster Municipal 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.

 

34

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
2011ND340ND
2012N/A00N/A
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A

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
2011-02-079888578016ND
2011-02-079888578009ND
2011-02-079888578010ND
2011-02-079888578011ND
2011-02-079888578012ND
2011-02-079888578013ND
2011-02-079888578014ND
2011-02-079888578017ND
2011-02-079888578006ND
2011-02-079888578015ND
2011-02-079888578008ND
2011-02-079888578007ND
2011-02-079888578003ND
2011-02-079888578001ND
2011-02-079888578005ND
2011-02-079888578002ND
2011-02-079888578004ND
2011-04-049898253003ND
2011-04-049898253015ND
2011-04-049898253006ND
2011-04-049898253002ND
2011-04-049898253016ND
2011-04-049898253017ND
2011-04-049898253014ND
2011-04-049898253008ND
2011-04-049898253007ND
2011-04-049898253009ND
2011-04-049898253010ND
2011-04-049898253005ND
2011-04-049898253011ND
2011-04-049898253012ND
2011-04-049898253004ND
2011-04-049898253013ND
2011-04-049898253001ND