Know Your Environment. Protect Your Health.

Atrazine

New Orleans Carrollton Waterworks

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)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.165 ppb84ND - 0.360 ppb
20190.172 ppb104ND - 0.440 ppb
2020ND50ND
20210.0932 ppb660.0900 ppb - 0.0960 ppb
20220.0683 ppb660.0480 ppb - 0.0890 ppb
20230.0497 ppb330.0490 ppb - 0.0500 ppb

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
2018-03-1535380391002ND
2018-03-1535380391001ND
2018-03-1535380391001ND
2018-03-1535380391002ND
2018-08-15354116330010.300 ppb
2018-08-15354116330020.360 ppb
2018-08-15354116330020.360 ppb
2018-08-15354116330010.300 ppb
2019-02-2735451097001ND
2019-02-2735451098001ND
2019-02-2735451098001ND
2019-02-2735451097001ND
2019-08-01354866610010.440 ppb
2019-08-01354866650010.420 ppb
2019-08-01354866610010.440 ppb
2019-08-01354866650010.420 ppb
2019-09-1935499418001ND
2019-09-1935499418001ND
2020-03-2635540032001ND
2020-03-2635540029001ND
2020-10-0835583701001ND
2020-10-0835583691001ND
2020-10-0835583702001ND
2021-03-29356223070010.0940 ppb
2021-03-29356223090010.0940 ppb
2021-03-29356223130010.0920 ppb
2021-10-14356710900010.0960 ppb
2021-10-14356710940010.0930 ppb
2021-10-14356710990010.0900 ppb
2022-03-15357047090010.0510 ppb
2022-03-15357047070010.0490 ppb
2022-03-15357047060010.0480 ppb
2022-10-13357534190010.0850 ppb
2022-10-13357534220010.0890 ppb
2022-10-13357534200010.0880 ppb
2023-03-06357839310010.0490 ppb
2023-03-06357839380010.0500 ppb
2023-03-06357839390010.0500 ppb