Know Your Environment. Protect Your Health.

Atrazine

Woodlake, City Of

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.

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND150ND
2019ND80ND
2020ND10ND
2021ND40ND
2022ND30ND
2023ND140ND

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
2018-02-27CA5410020_010_010-201802271418ND
2018-02-27CA5410020_009_009-201802271430ND
2018-06-28CA5410020_009_009-201806281344ND
2018-06-28CA5410020_010_010-201806281355ND
2018-06-28CA5410020_004_004-201806281258ND
2018-06-28CA5410020_005_005-201806281240ND
2018-06-28CA5410020_006_006-201806281320ND
2018-06-28CA5410020_007_007-201806281313ND
2018-09-20CA5410020_005_005-201809201240ND
2018-09-20CA5410020_004_004-201809201250ND
2018-09-20CA5410020_008_008-201809201210ND
2018-09-20CA5410020_010_010-201809201140ND
2018-09-20CA5410020_009_009-201809201154ND
2018-12-28CA5410020_010_010-201812281235ND
2018-12-28CA5410020_009_009-201812281305ND
2019-02-28CA5410020_010_010-201902281318ND
2019-02-28CA5410020_009_009-201902281335ND
2019-05-07CA5410020_010_010-201905071315ND
2019-05-07CA5410020_009_009-201905071340ND
2019-08-22CA5410020_010_010-201908221315ND
2019-08-22CA5410020_009_009-201908221331ND
2019-11-26CA5410020_009_009-201911261340ND
2019-11-26CA5410020_010_010-201911261325ND
2020-09-15CA5410020_010_010-202009151144ND
2021-05-21CA5410020_006_006-202105211255ND
2021-05-21CA5410020_007_007-202105211318ND
2021-08-31CA5410020_005_005-202108311010ND
2021-08-31CA5410020_004_004-202108311030ND
2022-09-22CA5410020_009_009-202209221328ND
2022-09-27CA5410020_008_008-202209271225ND
2022-12-29CA5410020_008_008-202212291048ND
2023-03-27CA5410020_008_008-202303271210ND
2023-03-27CA5410020_006_006-202303271240ND
2023-03-27CA5410020_009_009-202303271145ND
2023-03-27CA5410020_007_007-202303271255ND
2023-03-27CA5410020_005_005-202303271310ND
2023-03-27CA5410020_004_004-202303271340ND
2023-03-27CA5410020_010_010-202303271130ND
2023-06-05CA5410020_006_006-202306051250ND
2023-06-05CA5410020_008_008-202306051220ND
2023-06-05CA5410020_009_009-202306051145ND
2023-06-05CA5410020_010_010-202306051135ND
2023-06-05CA5410020_007_007-202306051310ND
2023-06-08CA5410020_004_004-202306081315ND
2023-06-08CA5410020_005_005-202306081325ND