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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

California Water Service Company - Dominguez

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND180ND
2014N/A00N/A
2015ND150ND
2016ND30ND
2017ND20ND

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
2013-05-085810-019-0954ND
2013-05-085810-050-1106ND
2013-05-085810-016-1250ND
2013-05-085810-024-1045ND
2013-05-145810-018-1515ND
2013-06-125810-023-1345ND
2013-06-205810-022-1245ND
2013-08-075810-019-1012ND
2013-08-075810-050-1235ND
2013-08-075810-016-1245ND
2013-08-075810-024-1105ND
2013-08-145810-018-1104ND
2013-09-115810-023-1110ND
2013-09-115810-022-1415ND
2013-09-195810-004-1428ND
2013-09-305810-036-1800ND
2013-11-135810-004-1354ND
2013-11-205810-036-0955ND
2015-03-255810-018-1330ND
2015-05-069590-036-1435ND
2015-05-069590-024-1050ND
2015-05-069590-023-1325ND
2015-05-069590-019-1015ND
2015-05-069590-004-1515ND
2015-05-139590-050-1250ND
2015-05-209590-022-1330ND
2015-05-209590-016-1312ND
2015-08-059590-050-1147ND
2015-08-129590-004-1140ND
2015-08-129590-036-1322ND
2015-08-129590-023-1115ND
2015-08-129590-019-1005ND
2015-08-199590-024-1040ND
2016-03-239590-018-1340ND
2016-08-249590-018-1015ND
2016-12-289590-019-0930ND
2017-03-089590-019-1430ND
2017-10-169590-805-1030ND