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EWG's Tap Water Database — 2021 UPDATE

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Atrazine

Midwest City

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.

MORE ABOUT THIS CONTAMINANT

 

66

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018ND420ND
2019ND240ND

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
2018-03-26AC27032-09ND
2018-03-26AC27032-08ND
2018-03-26AC27032-07ND
2018-03-26AC27032-06ND
2018-03-26AC27032-05ND
2018-03-26AC27032-04ND
2018-03-26AC27032-03ND
2018-03-26AC27032-02ND
2018-03-26AC27032-01ND
2018-06-18AF19074-05ND
2018-06-18AF19074-01ND
2018-06-18AF19074-02ND
2018-06-18AF19074-03ND
2018-06-18AF19074-04ND
2018-06-18AF19074-06ND
2018-06-18AF19074-07ND
2018-06-18AF19074-08ND
2018-06-18AF19074-09ND
2018-06-18AF19074-10ND
2018-06-18AF19074-11ND
2018-08-21AH22077-08ND
2018-08-21AH22077-01ND
2018-08-21AH22077-02ND
2018-08-21AH22077-03ND
2018-08-21AH22077-04ND
2018-08-21AH22077-05ND
2018-08-21AH22077-06ND
2018-08-21AH22077-07ND
2018-08-21AH22077-09ND
2018-08-21AH22077-10ND
2018-09-04AI05090-01RE1ND
2018-10-29AJ30053-05ND
2018-10-29AJ30053-04ND
2018-10-29AJ30053-03ND
2018-10-29AJ30052-01ND
2018-10-29AJ30052-02ND
2018-10-29AJ30052-03ND
2018-10-29AJ30052-04ND
2018-10-29AJ30052-05ND
2018-10-29AJ30052-06ND
2018-10-29AJ30053-01ND
2018-10-29AJ30053-02ND
2019-01-15BA15045-01ND
2019-02-25BB26050-07ND
2019-02-25BB26050-01ND
2019-02-25BB26050-02ND
2019-02-25BB26050-03ND
2019-02-25BB26050-04ND
2019-02-25BB26050-05ND
2019-02-25BB26050-06ND
2019-02-25BB26050-08ND
2019-02-25BB26050-09ND
2019-02-25BB26050-10ND
2019-02-25BB26050-11ND
2019-02-25BB26059-01ND
2019-10-28BJ29019-10ND
2019-10-28BJ29019-09ND
2019-10-28BJ29019-08ND
2019-10-28BJ29019-07ND
2019-10-28BJ29019-06ND
2019-10-28BJ29019-05ND
2019-10-28BJ29019-04ND
2019-10-28BJ29019-03ND
2019-10-28BJ29019-02ND
2019-10-28BJ29019-01ND
2019-12-09BL10033-01ND