Know Your Environment. Protect Your Health.

Atrazine

Fcwwd #41/shaver Lake

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.

 

33

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019ND40ND
2020ND30ND
2021ND140ND
2022ND110ND
2023ND10ND

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
2019-01-15CA1010017_014_014-201901151220ND
2019-03-28CA1010017_037_037-201903281200ND
2019-03-28CA1010017_044_044-201903281210ND
2019-06-26CA1010017_066_066-201906261230ND
2020-05-06CA1010017_048_048-202005060920ND
2020-05-06CA1010017_047_047-202005061050ND
2020-05-06CA1010017_049_049-202005061025ND
2021-03-08CA1010017_009_009-202103081140ND
2021-03-08CA1010017_001_001-202103081300ND
2021-04-05CA1010017_004_004-202104051120ND
2021-04-05CA1010017_008_008-202104051100ND
2021-04-05CA1010017_006_006-202104050900ND
2021-04-06CA1010017_012_012-202104061300ND
2021-04-06CA1010017_011_011-202104061245ND
2021-04-06CA1010017_042_042-202104061230ND
2021-04-12CA1010017_015_015-202104121345ND
2021-04-13CA1010017_034_034-202104131155ND
2021-04-14CA1010017_033_033-202104141300ND
2021-04-14CA1010017_005_005-202104141326ND
2021-04-19CA1010017_035_035-202104191045ND
2021-04-19CA1010017_036_036-202104191055ND
2022-02-11CA1010017_041_041-202202111400ND
2022-03-02CA1010017_059_059-202203021255ND
2022-03-02CA1010017_065_065-202203021240ND
2022-04-06CA1010017_043_043-202204061045ND
2022-04-06CA1010017_040_040-202204061105ND
2022-04-12CA1010017_056_056-202204121305ND
2022-04-12CA1010017_058_058-202204121345ND
2022-04-12CA1010017_057_057-202204121325ND
2022-04-19CA1010017_046_046-202204191300ND
2022-04-19CA1010017_038_038-202204191030ND
2022-08-03CA1010017_062_062-202208031330ND
2023-04-24CA1010017_002_002-202304241100ND