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EWG's Tap Water Database — 2021 UPDATE

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Atrazine

Irvine Ranch Water District

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

 

145

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND140ND
2015ND250ND
2016ND230ND
2017ND360ND
2018ND220ND
2019ND250ND

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
2014-01-144417-066-0930ND
2014-01-144417-067-1010ND
2014-02-114417-007-1215ND
2014-02-114417-056-1305ND
2014-03-114417-020-0930ND
2014-04-304417-056-1125ND
2014-04-304417-058-1215ND
2014-05-074417-007-0810ND
2014-05-154417-020-0910ND
2014-08-129588-060-1430ND
2014-08-284417-010-1045ND
2014-08-284417-058-0940ND
2014-10-074417-078-1300ND
2014-11-034417-010-0800ND
2015-01-124417-017-0940ND
2015-01-124417-078-1120ND
2015-01-274417-003-1015ND
2015-02-094417-004-0940ND
2015-02-234417-019-0905ND
2015-03-184417-005-0950ND
2015-03-184417-014-0930ND
2015-04-074417-017-1000ND
2015-04-084417-006-0900ND
2015-04-084417-078-1000ND
2015-04-294417-005-0840ND
2015-05-144417-019-1010ND
2015-05-204417-077-0750ND
2015-05-214417-014-0900ND
2015-05-284417-003-0810ND
2015-05-284417-004-0830ND
2015-06-014417-055-1035ND
2015-07-134417-077-1100ND
2015-07-144417-017-1020ND
2015-07-144417-078-0900ND
2015-07-154417-006-0910ND
2015-08-064417-055-0900ND
2015-08-189588-060-1056ND
2015-08-189588-075-0948ND
2015-10-054417-077-0930ND
2016-01-124417-077-1030ND
2016-01-284417-011-0845ND
2016-01-284417-016-0820ND
2016-01-284417-072-0925ND
2016-02-084417-009-0750ND
2016-02-254417-066-0950ND
2016-05-054417-058-1000ND
2016-05-314417-023-0905ND
2016-05-314417-024-0835ND
2016-05-314417-072-1115ND
2016-06-084417-011-0815ND
2016-06-084417-016-0755ND
2016-06-234417-008-0835ND
2016-06-239588-069-1133ND
2016-07-264417-008-0820ND
2016-07-264417-023-0920ND
2016-07-264417-024-0930ND
2016-08-094417-066-1050ND
2016-09-124417-007-0740ND
2016-09-124417-067-0945ND
2016-11-024417-067-1125ND
2016-11-149588-069-1154ND
2016-11-154417-007-0820ND
2017-01-194417-058-0940ND
2017-01-194417-067-0830ND
2017-02-144417-020-1340ND
2017-02-144417-066-0925ND
2017-02-289588-085-1334ND
2017-03-014417-020-0755ND
2017-03-144417-056-1210ND
2017-03-219588-063-1418ND
2017-03-219588-064-1437ND
2017-03-299588-069-1032ND
2017-04-269588-085-1040ND
2017-05-024417-010-0910ND
2017-05-024417-019-1035ND
2017-05-024417-023-0800ND
2017-05-094417-066-0930ND
2017-05-164417-006-1410ND
2017-05-174417-020-1140ND
2017-05-254417-056-1025ND
2017-06-014417-058-1110ND
2017-06-014417-078-1030ND
2017-07-054417-010-0745ND
2017-07-054417-019-0845ND
2017-07-054417-023-0820ND
2017-07-054417-078-0910ND
2017-07-134417-017-0750ND
2017-07-134417-058-0855ND
2017-08-014417-018-0830ND
2017-08-224417-006-0910ND
2017-09-124417-072-1100ND
2017-10-164417-017-0910ND
2017-10-164417-058-1110ND
2017-10-164417-072-1025ND
2017-11-084417-018-0745ND
2017-11-144417-015-0925ND
2017-11-144417-015-0935ND
2017-12-044417-009-0820ND
2018-02-064417-006-0800ND
2018-02-064417-017-0720ND
2018-02-084417-005-0800ND
2018-02-149588-085-1413ND
2018-02-154417-014-0835ND
2018-02-204417-003-1220ND
2018-02-204417-009-0810ND
2018-02-204417-015-0845ND
2018-02-204417-055-1030ND
2018-02-204417-058-1115ND
2018-04-094417-006-0930ND
2018-04-179588-085-1141ND
2018-04-194417-005-0900ND
2018-04-194417-014-0920ND
2018-04-194417-015-0940ND
2018-04-304417-055-1305ND
2018-04-304417-058-1330ND
2018-06-064417-009-0830ND
2018-06-194417-003-0830ND
2018-08-024417-058-1110ND
2018-10-094417-058-1315ND
2018-10-114417-006-1100ND
2019-01-214417-024-1120ND
2019-01-224417-011-0830ND
2019-01-224417-016-1010ND
2019-01-224417-067-1050ND
2019-02-214417-007-1155ND
2019-02-214417-008-1220ND
2019-02-214417-058-1015ND
2019-02-214417-077-0940ND
2019-02-289588-085-0743ND
2019-04-114417-058-1035ND
2019-04-114417-067-1220ND
2019-04-154417-011-1100ND
2019-04-154417-016-1005ND
2019-04-154417-024-1230ND
2019-04-164417-008-0805ND
2019-04-174417-077-1110ND
2019-05-014417-007-1005ND
2019-07-094417-066-1055ND
2019-07-179588-085-1413ND
2019-08-014417-058-1040ND
2019-08-014417-067-0845ND
2019-09-184417-004-1030ND
2019-10-034417-058-1135ND
2019-10-034417-066-0950ND
2019-10-074417-004-0935ND