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EWG's Tap Water Database — 2021 UPDATE

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Atrazine

Santa Clarita Water Division

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

 

56

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
2015ND260ND
2016ND20ND
2017N/A00N/A
2018ND280ND
2019N/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
2015-01-299590-002-1345ND
2015-01-299590-009-1220ND
2015-01-299590-019-0945ND
2015-01-299590-008-1010ND
2015-01-299590-016-1050ND
2015-01-299590-012-1135ND
2015-01-299590-039-1415ND
2015-01-299590-015-1145ND
2015-01-299590-013-1115ND
2015-01-299590-006-1320ND
2015-01-299590-040-1025ND
2015-04-299590-015-0935ND
2015-04-299590-012-1000ND
2015-04-299590-016-1200ND
2015-04-299590-009-1130ND
2015-04-299590-013-1025ND
2015-04-299590-008-1100ND
2015-04-299590-019-0930ND
2015-04-299590-039-1100ND
2015-04-299590-006-1215ND
2015-04-299590-040-0835ND
2015-04-299590-002-1135ND
2015-06-049590-007-0930ND
2015-08-279590-025-0945ND
2015-09-039590-007-1030ND
2015-12-029590-025-1125ND
2016-04-089590-014-0900ND
2016-07-119590-014-0840ND
2018-01-109590-013-0920ND
2018-01-109590-040-1115ND
2018-01-109590-002-0910ND
2018-01-109590-039-0950ND
2018-01-109590-006-0830ND
2018-01-109590-025-1330ND
2018-01-109590-007-1020ND
2018-01-109590-019-1100ND
2018-01-109590-008-1210ND
2018-01-109590-009-1150ND
2018-01-109590-014-1020ND
2018-01-109590-012-1310ND
2018-01-109590-015-0830ND
2018-02-149590-016-1035ND
2018-04-119590-015-1435ND
2018-04-119590-019-1050ND
2018-04-119590-007-0730ND
2018-04-119590-009-1135ND
2018-04-119590-008-1200ND
2018-04-119590-025-1045ND
2018-04-119590-006-0800ND
2018-04-119590-012-1005ND
2018-04-119590-014-1000ND
2018-04-119590-039-0915ND
2018-04-119590-002-0720ND
2018-04-119590-016-1220ND
2018-04-119590-013-0910ND
2018-04-119590-040-0815ND