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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

Prescott Valley WD Upper

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND140ND
2014N/A00N/A
2015N/A00N/A
2016ND200ND
2017N/A00N/A

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
2012-03-15201203160214SND
2012-07-25201207260390SND
2013-02-14201302150336SAND
2013-02-14201302150336SBND
2013-02-14201302150336SCND
2013-02-14201302150336SDND
2013-02-14201302150336SEND
2013-02-14201302190142SAND
2013-02-14201302190142SBND
2013-07-25201307250265SCND
2013-07-25201307250265SBND
2013-07-25201307250265SAND
2013-07-25201307250263SDND
2013-07-25201307250263SCND
2013-07-25201307250263SBND
2013-07-25201307250263SAND
2016-02-09201602100059SBND
2016-02-09201602100059SCND
2016-02-09201602100059SAND
2016-02-10201602110043SCND
2016-02-10201602110043SBND
2016-02-10201602110043SAND
2016-02-10201602110037SDND
2016-02-10201602110037SCND
2016-02-10201602110037SBND
2016-02-10201602110037SAND
2016-08-03201608040057SEND
2016-08-03201608040057SAND
2016-08-03201608040057SBND
2016-08-03201608040057SCND
2016-08-03201608040057SDND
2016-08-04201608050126SAND
2016-08-04201608050126SEND
2016-08-04201608050126SDND
2016-08-04201608050126SCND
2016-08-04201608050126SBND