Know Your Environment. Protect Your Health.

Atrazine

Woden Water Supply Corporation

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND20ND
2020ND20ND
2021ND60ND
2022ND20ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-03-20Q1811091004ND
2018-03-20Q1811091005ND
2018-03-20Q1811091006ND
2018-03-20Q1811091019ND
2018-03-20Q1811091020ND
2018-03-20Q1811091001ND
2019-01-16Q1902343014ND
2019-10-08Q1972051003ND
2020-04-07Q2014004013ND
2020-04-07Q2014004014ND
2021-03-16Q2106923001ND
2021-05-18Q2112986001ND
2021-10-11Q2128064001ND
2021-10-11Q2128064002ND
2021-10-11Q2128064003ND
2021-10-11Q2128064004ND
2022-03-03Q2207392001ND
2022-06-15Q2216701015ND
2023-03-01Q2308261008ND
2023-06-27Q2324601001ND
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